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Multimedia Card Registers
Table 18-23. SD_SYSTEST Register Field Descriptions (continued)
Bit Field Type Reset Description
2 CDAT R/W 0h
CMD input/output signal data value
0x0(W) = 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.
0x0(R) = 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 .
0x1(W) = 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.
0x1(R) = 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 .
1 CDIR R/W 0h
Control of the CMD pin direction
0x0(W) = The CMD line is an output (host to card).
0x0(R) = No action. Returns 0.
0x1(W) = The CMD line is an input (card to host) .
0x1(R) = No action. Returns 1.
0 MCKD R/W 0h
MMC clock output signal data value
0x0(W) = The output clock is driven low.
0x0(R) = No action. Returns 0.
0x1(W) = The output clock is driven high.
0x1(R) = No action. Returns 1.
3397
SPRUH73H–October 2011–Revised April 2013 Multimedia Card (MMC)
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