Texas Instruments AM335 Series Technical Reference Manual

Multimedia Card Registers www.ti.com
Table 18-23. SD_SYSTEST Register Field Descriptions (continued)
Bit Field Type Reset Description
7 D3D R/W 0h
DAT3 input/output signal data value.
0x0(W) = 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.
0x0(R) = 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.
0x1(W) = 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.
0x1(R) = 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.
6 D2D R/W 0h
DAT2 input/output signal data value.
0x0(W) = 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.
0x0(R) = 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.
0x1(W) = 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.
0x1(R) = 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.
5 D1D R/W 0h
DAT1 input/output signal data value.
0x0(W) = 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.
0x0(R) = 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.
0x1(W) = 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.
0x1(R) = 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.
4 D0D R/W 0h
DAT0 input/output signal data value.
0x0(W) = 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.
0x0(R) = 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.
0x1(W) = 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.
0x1(R) = 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.
3 DDIR R/W 0h Control of the DAT
[7:0] pins direction.
0x0(W) = The DAT lines are outputs (host to card).
0x0(R) = No action. Returns 0.
0x1(W) = The DAT lines are inputs (card to host).
0x1(R) = No action. Returns 1.
3396
Multimedia Card (MMC) SPRUH73H–October 2011–Revised April 2013
Submit Documentation Feedback
Copyright © 2011–2013, Texas Instruments Incorporated

Texas Instruments AM335 Series Specifications

General

Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English