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Table 9-17. System Test Register (SD_SYSTEST) Field Descriptions (continued)
Bit
Field
Value
5
D1D
Read 0
Write 0
Read 1
Write 1
4
D0D
Read 0
Write 0
Read 1
Write 1
3
DDIR
Read 0
Write 0
Read 1
Write 1
2
CDAT
Read 0
Write 0
Read 1
Write 1
1
CDIR
Read 0
Write 0
Read 1
Write 1
0
MCKD
Read 0
Write 0
Read 1
Write 1
SPRUGX9 – 15 April 2011
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Preliminary
Description
DAT1 input/output signal data value
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), returns the value on the DAT1 line (low).
If SD_SYSTEST[3] DDIR bit = 0 (output mode direction), returns 0.
If SD_SYSTEST[3] DDIR bit = 0 (output mode direction), the DAT1 line is driven low.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), no effect.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), returns the value on the DAT1 line (high)
If SD_SYSTEST[3] DDIR bit = 0 (output mode direction), returns 1.
If SD_SYSTEST[3] DDIR bit = 0 (output mode direction), the DAT1 line is driven high.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), no effect.
DAT0 input/output signal data value
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), returns the value on the DAT0 line (low).
If SD_SYSTEST[3] DDIR bit = 0 (output mode direction), returns 0.
If SD_SYSTEST[3] DDIR bit = 0 (output mode direction), the DAT0 line is driven low.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), no effect.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), returns the value on the DAT0 line (high)
If SD_SYSTEST[3] DDIR bit = 0 (output mode direction), returns 1.
If SD_SYSTEST[3] DDIR bit = 0 (output mode direction), the DAT0 line is driven high.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), no effect.
Control of the DAT[7:0] pins direction
No action. Returns 0.
The DAT lines are outputs (host to card).
No action. Returns 1.
The DAT lines are inputs (card to host).
CMD input/output signal data value
If SD_SYSTEST[1] CDIR bit = 1 (input mode direction), returns the value on the CMD line (low).
If SD_SYSTEST[1] CDIR bit = 0 (output mode direction), returns 0 .
If SD_SYSTEST[1] CDIR bit = 0 (output mode direction), the CMD line is driven low.
If SD_SYSTEST[1] CDIR bit = 1 (input mode direction), no effect.
If SD_SYSTEST[1] CDIR bit = 1 (input mode direction), returns the value on the CMD line (high)
If SD_SYSTEST[1] CDIR bit = 0 (output mode direction), returns 1 .
If SD_SYSTEST[1] CDIR bit = 0 (output mode direction), the CMD line is driven high.
If SD_SYSTEST[1] CDIR bit = 1 (input mode direction), no effect.
Control of the CMD pin direction
No action. Returns 0.
The CMD line is an output (host to card).
No action. Returns 1.
The CMD line is an input (card to host) .
clock output signal data value
No action. Returns 0.
The output clock is driven low.
No action. Returns 1.
The output clock is driven high.
Secure Digital (SD)/—Secure Digital I/O (SDIO) Card Interface
© 2011, Texas Instruments Incorporated
Registers
969
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