Preliminary
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Registers
9.4.7 System Test Register (SD_SYSTEST)
This register is used to control the signals that connect to I/O pins when the module is configured in
system test (SYSTEST) mode for boundary connectivity verification.
NOTE:
In SYSTEST mode, a write into SD_CMD register will not start a transfer. The buffer
behaves as a stack accessible only by the local host (push and pop operations). In this
mode, the Transfer Block Size (SD_BLK[10:0] BLEN bits) and the Blocks count for current
transfer (SD_BLK[31:16] NBLK bits) are needed to generate a Buffer write ready interrupt
(SD_STAT[4] BWR bit) or a Buffer read ready interrupt (SD_STAT[5] BRR bit) and DMA
requests if enabled.
The system test register (SD_SYSTEST) is shown in
and described in
Figure 9-35. System Test Register (SD_SYSTEST)
31
17
16
Reserved
OBI
R-0
R/W-0
15
14
13
12
11
10
9
8
SDCD
SDWP
WAKD
SSB
D7D
D6D
D5D
D4D
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
7
6
5
4
3
2
1
0
D3D
D2D
D1D
D0D
DDIR
CDAT
CDIR
MCKD
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
LEGENDR/W = Read/Write; R = Read only; -n = value after reset
Table 9-17. System Test Register (SD_SYSTEST) Field Descriptions
Bit
Field
Value
Description
31-17
Reserved
0
Reserved bit field. Do not write any value. Reads return 0.
16
OBI
Out-of-band interrupt (OBI) data value.
0
The out-of-band interrupt pin is driven low.
1
The out-of-band interrupt pin is driven high.
15
SDCD
Card detect input signal (SDCD) data value
0
The card detect pin is driven low.
1
The card detect pin is driven high.
14
SDWP
Write protect input signal (SDWP) data value
0
The write protect pin SDWP is driven low.
1
he write protect pin SDWP is driven high.
13
WAKD
Wake request output signal data value
Read 0
No action. Returns 0.
Write 0
The pin SWAKEUP is driven low.
Read 1
No action. Returns 1.
Write 1
The pin SWAKEUP is driven high.
12
SSB
Set status bit. This bit must be cleared prior attempting to clear a status bit of the interrupt status
register (SD_STAT).
Read 0
No action. Returns 0.
Write 0
Clear this SSB bit field. Writing 0 does not clear already set status bits.
Read 1
No action. Returns 1.
Write 1
Force to 1 all status bits of the interrupt status register (SD_STAT) only if the corresponding bit
field in the Interrupt signal enable register (SD_ISE) is set.
967
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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