Preliminary
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Registers
Table 9-17. System Test Register (SD_SYSTEST) Field Descriptions (continued)
Bit
Field
Value
Description
5
D1D
DAT1 input/output signal data value
Read 0
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.
Write 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.
Read 1
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.
Write 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.
4
D0D
DAT0 input/output signal data value
Read 0
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.
Write 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.
Read 1
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.
Write 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.
3
DDIR
Control of the DAT[7:0] pins direction
Read 0
No action. Returns 0.
Write 0
The DAT lines are outputs (host to card).
Read 1
No action. Returns 1.
Write 1
The DAT lines are inputs (card to host).
2
CDAT
CMD input/output signal data value
Read 0
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 .
Write 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.
Read 1
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 .
Write 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.
1
CDIR
Control of the CMD pin direction
Read 0
No action. Returns 0.
Write 0
The CMD line is an output (host to card).
Read 1
No action. Returns 1.
Write 1
The CMD line is an input (card to host) .
0
MCKD
clock output signal data value
Read 0
No action. Returns 0.
Write 0
The output clock is driven low.
Read 1
No action. Returns 1.
Write 1
The output clock is driven high.
969
SPRUGX9 – 15 April 2011
Secure Digital (SD)/—Secure Digital I/O (SDIO) Card Interface
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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