Rainbow Electronics W90P710CDG User 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.