User`s guide

Adding Support for the i.MX53 ESDHC
i.MX53 System Development User’s Guide, Rev. 1
Freescale Semiconductor 15-7
transmission level. The i.MX53 ESDHC includes three instances of the Enhanced Secured Digital Host
Controller Version 2 (ESDHCv2) within the ports 1, 2 and 4. ESDHC port 3 on the i.MX53 can be
configured to work either as ESDHCv3 or ESDHCv2.
Table 15-3 shows the supported operation modes.
SD Memory Cards support at least the two bus modes 1-bit or 4-bit width. The SD host sends a command
to the SD card to request a bus width change.
15.3.3 Interface Layouts
Figure 15-1 shows an example of an i.MX53 SD interface layout.
Figure 15-1. Example i.MX53 Board SD Interface Layout
Table 15-3. ESDHC Operation Modes
Modes of Operation Data Transfer Modes Frequency
MMC 1-bit, 4-bits or 8-bits full-speed (up to 20 MHz) high-speed (up to 52 MHz)
SD/SDIO 1-bit or 4-bit full-speed (up to 25 MHz ) high-speed (up to 50 MHz)
CE-ATA 1-bit, 4-bit, or 8-bit —
Identification Mode — up to 400 kHz