S5PV210_HARDWARE DESING GUIDE REV 1.0
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17. SD/MMC HOST CONTROLLER
S5PV210 has three slots for supporting high speed SD/MMC interface. SDMMC0 as 4-bit/8-bit MMC interface,
SDMMC1 support 4-bit MMC interfaces. Every MMC controller belongs to VDD_EXT0/1/2 power.
17.1. Signal Description
Signal
I/O
Description
SD0/1/2/3_CLK
O
CLOCK (SD/SDIO/MMC card interface channel 0)
SD0/1/2/3_CMD
IO
COMMAND/RESPONSE (SD/SDIO/MMC card interface channel 0)
SD0/1/2/3_CDn
I
CARD DETECT (SD/SDIO/MMC card interface channel 0)
SD0/1/2/3_DATA[3:0]
IO
DATA[3:0] (SD/SDIO/MMC card interface channel 0)
17.2. Muxed Signal usage
Case 1 (4 Channel Usage)
Case 2 (2 Channel Usage)
Channel 0
4-bit mode
8-bit mode
Channel 1
4-bit mode
Not available
Channel 2*
4-bit mode
8-bit mode
Channel 3*
4-bit mode
Not available
Every controller has up to 52MHz speed. So clock and data line should have same routing path.
(1) Voltage level should be the same between device and SD/MMC IO(VDD_EXT0/1/2 ).
Ch 0,1 belongs VDD_EXT0 power domain. Ch2 belongs VDD_EXT1. Ch3 belongs VDD_EXT2
(2) Add a 10K-external pull-up resistor to CMD line needs. And add 51K-external pull-up resistors to Data line.
(3) MMC channel 0 shares data lines with MMC channel 1 and MMC channel 2 shares data lines with MMC
channel 3. So it is impossible that CH0(or CH2) 8bit and CH1(or CH3) are used at the same time.
(4) DAT[3] card detection method didn’t recommend by following issues.
i)
Difficult to detect when card is removed during operation.
ii)
Pull-down resistor of dat3 cause different impedance between data lines.
iii)
Some cards don’t have enough internal pull-up resistors.
(5) SDMMC CH2 can be used for iROM second booting. So SD card slot is better to connect to CH2 for debugging.
Содержание S5PV210
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