Rainbow Electronics W90P710CDG - Manual (Page 244)

W90P710CD/W90P710CDG
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SD Interface Control Register (SDICR)
REGISTER ADDRESS R/W DESCRIPTION RESET VALUE
SDICR 0xFFF0_7300 R/W SD Interface Control Register 0x0000_0000
31 30 29 28 27 26 25 24
Reserved
23 22 21 20 19 18 17 16
Reserved
15 14 13 12 11 10 9 8
SD_CS Reserved CMD_CODE
7 6 5 4 3 2 1 0
CLK_KEEP 8CLK_OE 74CLK_OE R2_EN DO_EN DI_EN RI_EN CO_EN
BITS DESCRIPTIONS
[31:16] Reserved
-
[15] SD_CS
SD Card Select Control
0=Select SD card-0
1=Select SD card-1
It is fixed to 0 at W90P710
[13:8] CMD_CODE
SD Command Code
This register contains the SD command code (00H – 3FH).
[7] CLK_KEEP
SD Clock Enable
0=Disable SD clock generation
1=SD clock always keeps free running.
[6] 8CLK_OE
8 Clock Cycles Output Enable
0=Disable
1=Enable, SD host controller output 8 clock cycles
When the operation is finished, this bit is automatically cleared to “0”
by H/W circuit.