Preliminary
Registers
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Table 9-17. System Test Register (SD_SYSTEST) Field Descriptions (continued)
Bit
Field
Value
Description
11
D7D
DAT7 input/output signal data value
Read 0
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), returns the value on the DAT7 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 DAT7 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 DAT7 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 DAT7 line is driven high.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), no effect.
10
D6D
DAT6 input/output signal data value
Read 0
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), returns the value on the DAT6 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 DAT6 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 DAT6 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 DAT6 line is driven high.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), no effect.
9
D5D
DAT5 input/output signal data value
Read 0
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), returns the value on the DAT5 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 DAT5 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 DAT5 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 DAT5 line is driven high.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), no effect.
8
D4D
DAT4 input/output signal data value
Read 0
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), returns the value on the DAT4 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 DAT4 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 DAT4 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 DAT4 line is driven high.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), no effect.
7
D3D
DAT3 input/output signal data value
Read 0
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), returns the value on the DAT3 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 DAT3 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 DAT3 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 DAT3 line is driven high.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), no effect.
6
D2D
DAT2 input/output signal data value
Read 0
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), returns the value on the DAT2 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 DAT2 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 DAT2 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 DAT2 line is driven high.
If SD_SYSTEST[3] DDIR bit = 1 (input mode direction), no effect.
968
Secure Digital (SD)/—Secure Digital I/O (SDIO) Card Interface
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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