Changes between Version 26 and Version 27 of MMC

Timestamp:

12/16/2022 09:52:59 PM (17 months ago)

Author:

Tim Harvey

Comment:

added voltage to SD table

MMC

@@ -328 +328 @@
 === MicroSD bus
 The initial SD bus speed of 12.5MB/s is the default mode defined by SD1.0. Later a 25MB/s High Speed Mode (HS) was defined by SD1.1. As higher performance levels were needed to support new and faster devices the SD association introduced faster bus interfaces: UHS-I, UHS-II, UHS-III, and SD Express. The bus speed is started with 25MHz SDR mode and depending on the capabilities of the host and device can negotiate to higher rates:
-||= Mode         =||= Data Rate =||= Max Frequency =||= Max data rate at 8bit bus =||
-|| Default Speed (DS) || Single  || 25MHz   || 12.5MB/s ||
-|| High Speed (HS)    || Single  || 50MHz   || 25MB/s ||
-|| UHS-I DDR50        || Dual    || 50MHz   || 50MB/s ||
-|| UHS-I SDR50        || Single  || 100MHz  || 50MB/s ||
-|| UHS-I SDR104       || Single  || 208MHz  || 104MB/s ||
+||= Mode         =||= Voltage =||= Data Rate =||= Max Frequency =||= Max data rate at 8bit bus =||
+|| Default Speed (DS) || 3.3V || Single  || 25MHz   || 12.5MB/s ||
+|| High Speed (HS)    || 3.3V || Single  || 50MHz   || 25MB/s ||
+|| UHS-I DDR50        || 1.8V || Dual    || 50MHz   || 50MB/s ||
+|| UHS-I SDR50        || 1.8V || Single  || 100MHz  || 50MB/s ||
+|| UHS-I SDR104       || 1.8V || Single  || 208MHz  || 104MB/s ||
  * Note that UHS-I requires support for voltage switching I/O rail from 3.3V to 1.8V
  * All modes start at DS and negotiate up if supported on both host and card