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Multimedia Card Registers
Table 18-23. SD_SYSTEST Register Field Descriptions (continued)
Bit Field Type Reset Description
11 D7D R/W 0h
DAT7 input/output signal data value.
0x0(W) = 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.
0x0(R) = 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.
0x1(W) = 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.
0x1(R) = 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.
10 D6D R/W 0h
DAT6 input/output signal data value.
0x0(W) = 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.
0x0(R) = 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.
0x1(W) = 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.
0x1(R) = 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.
9 D5D R/W 0h
DAT5 input/output signal data value.
0x0(W) = 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.
0x0(R) = 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.
0x1(W) = 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.
0x1(R) = 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.
8 D4D R/W 0h
DAT4 input/output signal data value.
0x0(W) = 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.
0x0(R) = 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.
0x1(W) = 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.
0x1(R) = 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.
3395
SPRUH73H–October 2011–Revised April 2013 Multimedia Card (MMC)
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