[[PageOutline]]

= Gateworks Single Board Computers Revisions =
This page is to describe the difference between hardware revisions.

[=#newport]
= Newport Family

[=#gw640x]
== GW640x

=== Revision A.1
Date: 06/21/2018
 * Initial release

=== Revision B
Date: 11/29/2018
 * Replace 0.22uF AC coupling caps on !SerDes lanes with 0.1uF (recommended values for PCIe gen1/gen2)
 * Change boot device from eMMC_SS to the more robust eMMC_LS (which includes an eMMC reset before retry)
 * Add CN80XX FUSE blowing capability for chips supporting trusted boot (see [wiki:newport/errata#np4 Errata NP4])
 * Add external temperature sensor capable of providing CN80XX CPU die temperature (see [wiki:newport/errata#np3 Errata NP3])
 * Add CPU Speed adjustment capability using GSC (requires upcoming GSC feature)
 * Add build option to allow off-board I2C to be at 5V or 3.3V
 * Remove unnecessary SATA mux and replace AC coupling caps on PCIe RX differential pair going to J10 miniPCIe socket with 0ohm resistors. If user is going to be using an mSATA device on this socket they may need to have boards built with 0.1uf coupling caps here per the mSATA specification
 * Add build option to allow bypass of serial port transceiver
 * Fix CAN transceiver OSC input
 * Fix QSGMII SPD/ACT LEDs
 * Add reverse-polarity protection on Vin (see [wiki:newport/errata#np2 Errata NP2])
 * Add buid option to allow bypass of PoE circuit
 * Improve FAN TACH circuit to support both open drain (OD) and driven TACH outputs
 * Add support for optional 802.3bt (PoE++)
 * Improve processor core voltage rail by widening copper fills
 * Increase output voltage of GSC input LDO from 3.32V to 3.5V to avoid draining surface charge from newly installed battery
 * Replace heatsink with fansink


=== Revision B.1 (GW6404 only)
Date: 11/29/2018
 * Fix CAN transceiver by terminating STBY signal to GND (see [wiki:newport/errata#np7 Errata NP7])


[=#gw630x]
== GW630x

=== Revision B.2
Date: 12/15/2017
 * Initial release
 * Fix GSC BATT current protection (cut/wire)

=== Revision B.3
Date: 01/04/2018
 * Fix voltage strapping for MDIO (cut/wire) (see [wiki:newport/errata#np1 Errata NP1])
 * Load resistors for PHY_RST# capability (see [wiki:newport/errata#np1 Errata NP1])

=== Revision C
Date: 01/04/2018
 * Replace 0.22uF AC coupling caps on !SerDes lanes with 0.1uF (recommended values for PCIe gen1/gen2)
 * Move CPU LEDR from GPIO-13 to GPIO-31 to resolve CPU frequency strapping (850MHz -> 800MHz)
 * Move PHY_RST# from GPIO-31 to GPIO-23 and make open-collector
 * Fix voltage strapping for MDIO (see [wiki:newport/errata#np1 Errata NP1])
 * Fix GSC BATT current protection
 * Replace USB3 VBUS filters for improved manufacture-ability
 * Add EMI protection on RJ45 LED's
 * Added series resistor to miniPCI socket PERST# signals (to allow optional unload)

=== Revision D.1
Date: 01/13/2018
 * Add reverse-polarity protection on Vin (see [wiki:newport/errata#np2 Errata NP2])
 * Add external temperature sensor capable of providing CN80XX CPU die temperature (see [wiki:newport/errata#np3 Errata NP3])
 * Add CN80XX FUSE blowing capability for chips supporting trusted boot (see [wiki:newport/errata#np4 Errata NP4])
 * Use 0.22uF AC coupling caps for all PCIe channels as this is required for PCIe gen3 and backward compatible with gen1/2
 * Improve FAN TACH circuit to support both open drain (OD) and driven TACH outputs
 * Improve MMC trace routing
 * Change boot device from eMMC_SS to the more robust eMMC_LS (which includes an eMMC reset before retry)
 * Add CPU Speed adjustment capability using GSC (requires upcoming GSC feature)
 * Add build option to allow off-board I2C to be at 5V or 3.3V
 * Remove unnecessary SATA mux and replace AC coupling caps on PCIe RX differential pair going to J10 miniPCIe socket with 0ohm resistors. If user is going to be using an mSATA device on this socket they may need to have boards built with 0.1uf coupling caps here per the mSATA specification
 * Add build option to allow isolating J11 miniPCIe clock signals to eliminate contention with non-standard cellular modems
 * Add support for optional 802.3bt (PoE++)

=== Revision E
Date: 01/10/2018
 * Disable USB Battery Charge Revision 1.2 (BC1.2) on Front Panel (USB BC disables USB power if a device does not negotiate within an amount of time which is too long for USB based modems to enumerate)
 * Add 4.75K pull up resistors to all OcteonTX digital IO signals
 * Fix CAN transceiver by terminating STBY signal to GND (see [wiki:newport/errata#np7 Errata NP7])
 * Add build option to bypass the GSC battery LDO
 * Add build option to support Unex V2X miniPCIe form-factor radio
 * Add build option for LIS2DE12 3-axis accelerometer (loaded on GW6304)

[=#gw620x]
== GW620x

=== Revision A.1
Date: 09/10/2018
 * Initial release

=== Revision B
Date: 01/10/2018
 * Disable USB Battery Charge Revision 1.2 (BC1.2) on Front Panel (USB BC disables USB power if a device does not negotiate within an amount of time which is too long for USB based modems to enumerate)
 * Add 4.75K pull up resistors to all OcteonTX digital IO signals
 * Fix CAN transceiver by terminating STBY signal to GND (see [wiki:newport/errata#np7 Errata NP7])
 * Add build option to bypass the GSC battery LDO
 * Add build option for LIS2DE12 3-axis accelerometer (loaded on GW6304)
 * Add user pushbutton


[=#gw610x]
== GW610x

=== Revision B
Date: 01/10/2018
 * Initial release


----

[=#ventana]
= Ventana Family =

[=#gw51xx]
== GW51xx ==

=== Revision A ===
Date: 04/19/2013
 * Initial release

=== Revision B ===
Date: 09/17/2013
 * Add VDD_HIGH to GSC analog input for voltage monitoring
 * Select GPS 4800 baud NMEA protocol by default
 * Reduce voltage drop for USB OTG VBUS
 * Adjust 5V boost converter feedback resistors for more accurate 5V
 * Add i.MX6 GPIO control of mini-PCIe WiFi? disable
 * Move mounting holes to match other Ventana boards
 * Improve HDMI and OTG connectors footprints
 * Modify JTAG route from a star to a daisy chain topology

=== Revision B.1 === 
Date: 11/08/2013
 * Eliminate possible high input voltage on the switching supply enable input by removing unnecessary R34 pullup

=== Revision C === 
Date: 09/04/2014
 * Add diode to prevent power backfeed when board is powered off and a USB cable is plugged in to a powered host (see [wiki:ventana/errata#hw8 Errata HW8])
 * Connect GPS PPS signal to reserved pin 49 on Mini-PCIe socket through unloaded configuration resistor
 * Change GSC VDD_HIGH connection to include a divide-by-two resistive divider since voltage exceeds analog-to-digital converter 2.5V reference
 * Add GSC analog input option to DIO
 * Replace U15 input power supply to increase operating voltage range and improved manufacturability
 * Ground RTC XTAL input to eliminate noise causing pre-mature watchdog resets (see [wiki:ventana/errata#hw7 Errata HW7])

=== Revision D === 
Date: 03/05/2015
 * Add optional 3.3V primary power supply bypass connector to power the board with well regulated 3.3V +/-5% input
 * Move watchdog timer from WDOG2_B to WDOG1_B for mainstream Linux support
 * Add 32.768KHz crystal to processor real time clock for increased watchdog timer and Linux time of day accuracy
 * Reduce PORJ pullup resistor value for faster rise time Improve inductor footprints for improved manufacturability

=== Revision E.1 === 
Date: 12/23/2015
 * Add series resistor between battery positive and reverse current diode for UL two level protection
 * Reduce PCIe clock jitter to GEN2 levels by adding a clock generator providing the CPU and PCIe socket clock input (see [wiki:ventana/errata#hw14 Errata HW14])
 * Add processor external watchdog support by connecting WDOG_B to PMIC PWRON input

=== Revision F === 
Date: 10/17/2016:
 * Reduce emissions / EMI on RGMII clock signal with 22 ohm series resistor
 * Replaced GbE crystal for increased lifespan

=== Revision F.1 (GW5104 only) === 
Date: 1/13/2019:
 * Replace NAND flash. Has different block size. Read more [wiki:ventana/errata#hw22 here]



[=#gw520x]
== GW520x ==

=== Revision A === 
Date: 10/18/2013
 * Initial Release

=== Revision A.1 === 
Date: 10/18/2013
 * Replace decoupling capacitors on the clock buffer input with series resistors for improved PCIe clock performance.

=== Revision B.1 === 
Date: 1/30/2014
 * Add WiFi disable signal to all Mini-PCIe sockets through zero ohm resistors
 * Add optional load JST 1x2x2mm connector under the pushbutton switch
 * Add ability to route USB OTG to miniPCIe socket instead of front-panel via GPIO
 * Replace 2-pin tamper switch connector with 3-pin connector to support CAN Bus, RS485, TTL serial and tamper switch option
 * Add optional CAN Bus transceiver
 * Add optional RS485 transceiver
 * Add optional TTL serial bypass resistors
 * Add option for 3.3V and 5V power to one pin of the digital I/O connector through unloaded configuration resistors

=== Revision C.1 === 
Date: 3/31/2015
 * Replace obsolete J2 uSD/SIM socket with functionally equivalent socket
 * Replace 3.3V TVS arrays with 2.5V arrays for improved protection
 * Add 3.3V voltage translator to both 2.5V PCISKTx_RSTJ signals for increased voltage margin
 * Remove capacitor on tamper switch input to reduce switch debounce time constant
 * Add Schottky diode to USB_H1_VBUS net to prevent i.MX6 backfeed when board is powered off and active USB cable is plugged in
 * Connect I2C3 bus to the digital I/O connector through unloaded configuration resistors
 * Connect GPS PPS signal to reserved pin on both Mini-PCIe sockets through unloaded configuration resistors
 * Add changes to support SOM application, (a) add CAN bus transceiver bypass resistors, (b) add RS232 transceiver bypass resistors, (c) add connector under uSD/SIM socket to support SD, USB, battery voltage, and reset, (d) add 2-pin power input connector
 * Add "USB" to PCIe socket silkscreen for clarification

=== Revision C.2 === 
Date: 4/3/2015
 * Add 100 ohm differential PCIe clock termination resistor for improved PCIe clock compliance.

=== Revision D === 
Date: 2/18/2016
 * Move watchdog timer from WDOG2_B to WDOG1_B for mainstream Linux support
 * Add 32.768KHz crystal to processor real time clock for increased watchdog timer and Linux time of day accuracy
 * Replace audio codec logic ground connection with two zero ohm configuration resistors for connecting to analog ground by default audio connector J11.5 as an option
 * Add optional GSC analog input to J4.1 connector through divide by two configuration resistors unloading the series resistor for backwards compatibility
 * Add optional 4-pin friction latching connector for micro-B OTG connector
 * Add optional OTG ID pulldown resistor to configure OTG port for host operation when optional 4-pin connector is loaded
 * Reduce PORJ pullup resistor value for faster rise time
 * Add series resistor between battery positive and reverse current diode for UL two level protection
 * Add processor watchdog support by connecting WDOG_B to PMIC PWRON input
 * Add support for UHS-1 MMC cards to run at their full speed capability
 * Reduce PCIe clock jitter to GEN2 levels by replacing clock buffer with clock generator and connecting clock output back to processor PCIe clock input
 * Replace RGMII_TXCLK series resistor with 22.1 ohm device and add second 22.1 series resistor to RGMII_RXCLK to reduce radiated emissions
 * Improve processor core voltage rails by adding on 22uF capacitor to both VDD_ARM and VDD_SOC and widening copper fills
 * Update SIM/uSD socket footprint and move 0.2mm closer to board edge for improved manufacturing
 * Move USB signals away from SIM/uSD mounting tab slot to improve fabrication processes

=== Revision D.1 (GW5204 only) === 
Date: 1/13/2019:
 * Replace NAND flash. Has different block size. Read more [wiki:ventana/errata#hw22 here]

[=#gw522x]
== GW522x ==

=== Revision A === 
Date: 01/29/2015
 * Initial release

=== Revision A.1 === 
Date: 04/21/2015
 * Improve PCIe clock termination

=== Revision B === 
Date: 04/29/2015
 * Reduce PORJ pullup resistor value for faster rise time
 * Improve PCIe clock termination
 * Add processor watchdog support by connecting WDOG_B to PMIC PWRON input (see [[wiki:ventana/errata#hw12 Errata HW12])
 * Add support for UHS-1 MMC cards to run at their full speed capability (see [wiki:ventana/errata#hw16 Errata HW16])
 * Correct the SPI connector bottom side silkscreen pin labels

=== Revision C === 
Date: 07/22/2015
 * Add series resistor between battery positive and reverse current diode for UL two level protection
 * Reduce PCIe clock jitter to GEN2 levels by replacing clock buffer with clock generator and connecting clock output back to processor PCIe clock input (see [wiki:ventana/errata#hw14 Errata HW14])
 * Replace RGMII_TXCLK series resistor with 22.1 ohm device and add second 22.1 series resistor to RGMII_RXCLK to reduce radiated emissions
 * Add optional 3.3V primary power supply bypass connector to power the board with well regulated 3.3V +/-5% input
 * Improve processor core voltage rails by adding on 22uF capacitor to both VDD_ARM and VDD_SOC and widening copper fills

=== Revision D === 
Date: 01/04/2017:
 * Add wide range linear regulator for powering the GSC battery from the input voltage when board power is turned off to extend battery life
 * Add option for external GSC battery connector
 * Replaced GbE crystal for increased lifespan

=== Revision D.1 ===
Date: 01/06/2017:
 * Add LDO output capacitor.

=== Revision E ===
Date: 05/16/2017:
 * Swap CTS and RTS for optional UART flow-control (resistor option) 
 * Add series resistor on each miniPCIe PERST# signal to allow unloading if needed
 * Add LDO output capacitor missing on Rev D and added on Rev D.1
 * Replace LDO input capacitor with 100V variant for improved Vin margin
 * Extend SPI from J24 connector to J8 via optional series resistors

=== Revision F
Date: 11/29/2018:
 * added build option for alternate 2-pin power input

=== Revision F.1 (GW5224 only) === 
Date: 1/13/2019:
 * Replace NAND flash. Has different block size. Read more [wiki:ventana/errata#hw22 here]


[=#gw53xx]
== GW53xx ==

=== Revision A === 
Date: 12/17/2013
 * Initial revision

=== Revision A.1 === 
Date: 12/17/2013
 * Replace decoupling capacitors on the clock buffer input with series resistors for improved PCIe clock performance

=== Revision B === 
Date: 12/05/2013
 * Add resistor load option for I2C support via DIO connector

=== Revision C === 
Date: 07/29/2015
 * Replace obsolete J2 uSD/SIM socket with functionally equivalent socket
 * Improved RJ45 TVS arrays
 * Add 3.3V voltage translator to 2.5V PCISKTx_RSTJ signals for increased voltage margin
 * Remove capacitor on tamper switch input to reduce switch debounce time constant (see [wiki:ventana/errata#hw4 Errata HW4])
 * Add Schottky diode to USB_H1_VBUS net to prevent i.MX6 backfeed when board is powered off and active USB cable is plugged in (see [wiki:ventana/errata#hw8 Errata HW8])
 * Connect GPS PPS signal to reserved pin on both Mini-PCIe sockets pin 49 through unloaded configuration resistors
 * Add optional GSC analog input to J10.4 connector through divide by two configuration resistors unloading the series resistor for backwards compatibility
 * Increase USB boost converter power to 1.6A max current (see [wiki:ventana/errata#hw6 Errata HW6])

=== Revision C.1 ===
 * Update GW53xx-C to include 100 ohm differential PCIe clock termination resistor.

=== Revision D === 
Date: 10/10/2014
 * Move watchdog timer from WDOG2_B to WDOG1_B for mainstream Linux support
 * Add 32.768KHz crystal to processor real time clock for increased watchdog timer and Linux time of day accuracy
 * Replace audio codec logic ground connection with two zero ohm configuration resistors for connecting to analog ground by default and audio connector as an option
 * Add option to bypass CAN bus transceiver to provide additional TTL UARt
 * Add option to bypass RS232 transceiver

=== Revision E === 
Date: 03/31/2015
 * Reduce PORJ pullup resistor value for faster rise time
 * Improve processor core voltage rails by adding on 22uF capacitor to both VDD_ARM and VDD_SOC and widening copper fills
 * Reduce PCIe clock jitter to GEN2 levels by replacing clock buffer with clock generator and connecting clock output back to processor PCIe clock input (see [wiki:ventana/errata#hw14 Errata HW14])
 * Add processor external watchdog support by connecting WDOG_B to PMIC PWRON input
 * Add support for UHS-1 MMC cards to run at their full speed capability (see [wiki:ventana/errata#hw16 Errata HW16])

=== Revision F === 
 * Improve 5V Boost Supply for powering CAN, HDMI, and LVDS. (resolves [wiki:ventana/errata#hw18 Errata HW18])
 * Reduce emissions / EMI on RGMII clock signal with 22 ohm series resistor
 * Improve voltage rails with larger traces and capacitors for greater stability when operating in LDO-Bypass mode
 * Improve USB host connector durability

=== Revision F.1 (GW5304 only) === 
Date: 1/13/2019:
 * Replace NAND flash. Has different block size. Read more [wiki:ventana/errata#hw22 here]


[=#gw54xx]
== GW54xx ==

=== Revision B === 
Date: 03/14/2013
 * Initial Revision

=== Revision C === 
Date: 07/16/2013
 * Add optional 3.3V primary power supply bypass connector to power the board with well regulated 3.3V +/-5% input
 * Fix Analog Video input functionality (see [wiki:ventana/errata#hw1 Errata HW1])
 * Fix GPS Antenna Short Protection (see [wiki:ventana/errata#hw2 Errata HW2])
 * Replace MMA8451 accelerometer with FXOS8700 accelerometer/magnetometer
 * Replace GSP with Wi2Wi Wi2Wi W2SG0008i for improved functionality
 * Replace UART handshake with additional UART tx/rx and made previous hardware handshaking a resistor loading option

=== Revision D === 
Date: 01/13/2014
 * Add optional serial console bypass to the RS485 connector
 * Add PoE diodes to second Ethernet connector for increased functionality
 * Add i.MX6 GPIO control of mini-PCIe WiFi? disable
 * Add installed SIM card outline to silkscreen for ease of use

=== Revision E === 
Date: 6/28/2016:
 * Add diode to prevent power backfeed when board is powered off and a USB cable is plugged in to a powered host (see [wiki:ventana/errata#hw8 Errata HW8])
 * Connect GPS PPS signal to reserved pin 49 of J9 (Top right) and J10 (Bottomr left/center)  Mini-PCIe sockets through unloaded configuration resistors as a build option
 * Add 3.3V voltage translator to miniPCIe socket PERST# signals for increased voltage margin
 * Unload capacitor C473 to resolve issue with off-board tamper signal (see [wiki:ventana/errata#hw4 Errata HW4])
 * Add 32.768KHz crystal to processor real time clock for increased watchdog timer and Linux time of day accuracy
 * Add ability to bypass CAN transceiver through loadable resistors
 * Add ability to bypass UART2 RS232 transceiver through loadable resistors
 * Improved GPS Antenna short circuit fault monitoring by lowering trip threshold to allow for higher power active antennas
 * Replace audio codec logic ground connection with two zero ohm configuration resistors for connecting to analog ground by default audio connector J28.5 as an option
 * Add 0 to 5V GSC analog input available via 3-byte register at 0x1A to previously unused J27.4 connector
 * Add resistor loading option to provide 3.3V to J16.3
 * Add resistor loading option to provide 5.0V to J16.4
 * Add series resistor between battery positive and reverse current diode for UL two level protection
 * Add processor watchdog support by connecting WDOG2_B to PMIC PWRON input (see [wiki:ventana/errata#hw12 Errata HW12])
 * Reduce PCIe clock jitter to GEN2 levels by routing clock generator output back to processor  PCIe clock input (see [wiki:ventana/errata#hw14 Errata HW14])
 * Add support for UHS-1 MMC cards to run at their full speed capability (see [wiki:ventana/errata#hw16 Errata HW16])
 * Add a reset generator to improve signalling during board reset
 * Improve processor core voltage rails by adding on 22uF capacitor to both VDD_ARM and VDD_SOC and widening copper fills for greater stability when operating in LDO-Bypass mode as well as supporting higher frequency processors
 * Reduce emissions / EMI on RGMII clock signal with 22 ohm series resistor
 * Improve USB host connector durability
 * Add SPI support via J32 ((ECSPI2 SS0) (see SPI))

=== Revision E.1 === 
Date: 6/29/2016:
 * Increase VDD_1P8 current flow with soldered wire

=== Revision F === 
Date: 11/01/2016:
 * Increase VDD_1P8 trace width to remove need for wire from Revision E.1

=== Revision F.1 (GW5404 only) === 
Date: 1/13/2019:
 * Change resistor loading for PCIe routing to mezzanine connector. Read more [wiki:ventana/errata#hw22 here]

=== Revision F.2 (GW5404 only) === 
Date: 1/13/2019:
 * Replace NAND flash. Has different block size. Read more [wiki:ventana/errata#hw22 here]



[=#gw551x]
== GW551x ==

=== Revision A.1 === 
Date: 01/08/2015
 * Initial release

=== Revision B === 
Date: 02/18/2015
 * Move passives further from mounting holes
 * Increase spacing between the HDMI input and HDMI output connectors
 * Reduce PORJ pullup resistor value for faster rise time
 * Improve HDMI video input to allow YUV422 semi-planar input allowing 1080p@60Hz (see [wiki:ventana/errata#hw9 Errata HW9])
 * Fix USB OTG device mode (see [wiki:ventana/errata#hw10 Errata HW10])

=== Revision C === 
Date: 10/06/2016:
 * Add series resistor between battery positive and reverse current diode for UL two level protection
 * Add processor external watchdog support by connecting WDOG_B to PMIC PWRON input (see [wiki:ventana/errata#hw12 Errata HW12])
 * Reduce PCIe clock jitter to GEN2 levels by adding a clock generator providing the CPU and PCIe socket clock input (see [wiki:ventana/errata#hw14 Errata HW14])
 * Adjust processor drive on CPU crystal for increased lifespan
 * Improve processor core voltage rails by adding on 22uF capacitor to both VDD_ARM and VDD_SOC and widening copper fills

=== Revision C.1 === 
Date: 02/10/2017:
 * Fix HS/CLK on HDMI Input

=== Revision D === 
Date: 03/02/2017:
 * Fix YUV422 semi-planar HDMI input to support 1080p60

=== Revision D.1 (GW5514 only) === 
Date: 1/13/2019:
 * Replace NAND flash. Has different block size. Read more [wiki:ventana/errata#hw22 here]




[=#gw552x]
== GW552x ==

=== Revision A.2 === 
Date: 11/19/2014
 * Initial release

=== Revision B === 
Date: 07/29/2015
 * Add diode to prevent power backfeed when board is powered off and a USB cable is plugged in to a powered host (see [wiki:ventana/errata#hw8 Errata HW8])
 * Add 3.3V voltage translator to 2.5V PCISKTx_RSTJ signals for increased voltage margin
 * Move watchdog timer from WDOG2_B to WDOG1_B for mainstream Linux support
 * Add 32.768KHz crystal to processor real time clock for increased watchdog timer and Linux time of day accuracy
 * Move barrel jack to the opposite side of the power supply to eliminate interface between HDMI and barrel jack mating connectors
 * Add software controllable USB switch to configure one of the panel USB ports for either host or device

=== Revision C === 
Date: 03/29/2016
 * Reduce PORJ pullup resistor value for faster rise time
 * Add series resistor between battery positive and reverse current diode for UL two level protection
 * Adjust processor drive on CPU crystal for increased lifespan
 * Improve processor core voltage rails by adding on 22uF capacitor to both VDD_ARM and VDD_SOC  and widening copper fills
 * Add processor external watchdog support by connecting WDOG_B to PMIC PWRON input
 * Reduce PCIe clock jitter to GEN2 levels by adding a clock generator providing the CPU and PCIe socket clock input (see [wiki:ventana/errata#hw14 Errata HW14])
 * Add resistor load option for SPI support via J8 ((ECSPI3 J8.1:SS0# J8.2:SCLK, J8.17:MOSI, J8.18:MISO see SPI))
 * Add resistor load option for I2C support via J8 ((I2C3: J8.17:SCL, J8.18:SDA))
 * Move battery to reduce heat impact on it's lifespan
 * Replace J8 10pin connector with 20pin connector

=== Revision C.1 ===
Date: 10/18/2016
 * Replace J8 20pin connector with 10pin connector (20pin connector available as option)


[=#gw553x]
== GW553x ==

=== Revision B === 
Date: 08/30/2016
 * Add processor external watchdog support by connecting WDOG_B to PMIC PWRON input
 * Replace 2-pin connector with reset switch for standard product (2-pin connector is optional)
 * Replace 2-pin connector with user LED (2-pin connector is optional)

=== Revision B.1 (GW5534 only) === 
Date: 1/13/2019:
 * Replace NAND flash. Has different block size. Read more [wiki:ventana/errata#hw22 here]

----

[=#laguna]
= Laguna Family =

[=#gw2388]
== GW2388-4 ==
=== Revision A ===  
Date: 12/2009
 * Initial Release 

=== Revision B ===  
Date: 05/2010

 * Improve GSC battery circuit to increase battery life
 * Add core buck regulator power sequencing for reliable power up
 * Add VTT generator capacitance to reduce output ripple 
 * Correct SATA connector footprint and adding optional SATA power connector
 * Replace through hole DB9 connector with surface-mount connector for improved manufacturing

=== Revision C ===
Date: 12/2010
 * Change watchdog timer circuit to ensure narrow pulse width generates reset
 * Add ARM processor digital I/O control of USB voltage generator
 * Add GW16038 mounting hole for increased mechanical retention
 * Add fifth GW2388 mounting hole near center of board for increased stability in high vibration environment
 * Add support for micro SD card detection signal 
 * Add optional USB header under USB panel jack for optional external connector mounting
 * Add series resistor to the GPS receiver antenna power signal to remove possibility of circuit damage in response to an antenna short
 * Add filter capacitors to LED, reset, and tamper switch connectors to reduce radiated emissions.
=== Revision D === 
Date: 09/2011
 * Increase default DDR2 memory size from 128Mytes to 256Mbytes due to price reduction in newer parts
 * Replace core voltage switchers with newer devices that do not require the reset generator for under voltage lockout
 * Update primary 3.3V switcher with newer Mosfets and Inductor to improve efficiency by 10% and improve transient response for supporting higher power radios.
=== Revision E === 
Date: 08/2012
 * Change the Mini-PCIe bridge reset from system reset to ARM Processor GPIOA11 to ensure it remains low until after the PCIe clock is valid.
=== Revision F === 
Date: 12/2012
 * Terminate unused PCIe bridge inputs to correct for TI design flaw that potentially locks up the bridge at low temperature and high humidity environments 
 * Replace bipolar transistor used to drive fan with a MOSFET device for increased current capability
 * Add passive filter to JTAG system reset input to reduce EMI sensitivity.
=== Revision G ===
Date: 12/2013
 * Replace ARM processor clock with an external clock generator to reduce jitter on PCIe differential clocks
 * Add diodes to the PoE return paths on both channels for full isolation when being powered by an 802.3 switch
 * Replace N-channel MOSFET used to drive fan with a P-channel device for proper control.
=== Revision H === 
Date: 02/2014
 * Move the PCIe interrupts from processor digital I/O signals to dedicated interrupts for improved interrupt capability
= Other SBC Families =
Please contact support