Preliminary
Registers
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9.4.21 SD System Control Register (SD_SYSCTL)
This register defines the system controls to set software resets, clock frequency management and data
timeout.
•
SD_SYSCTL[31:24] = Software resets
•
SD_SYSCTL[23:16] = Timeout control
•
SD_SYSCTL[15:0] = Clock control
The SD system control register (SD_SYSCTL) is shown in
and described in
Figure 9-49. SD System Control Register (SD_SYSCTL)
31
27
26
25
24
23
20
19
16
Reserved
SRD
SRC
SRA
Reserved
DTO
R-0
R/W-0
R/W-0
R/W-0
R-0
R/W-0
15
6
5
3
2
1
0
CLKD
Reserved
CEN
ICS
ICE
R/W-0
R-0
R/W-0
R-0
R/W-0
LEGENDR/W = Read/Write; R = Read only; -n = value after reset
Table 9-31. SD System Control Register (SD_SYSCTL) Field Descriptions
Bit
Field
Value
Description
31-27
Reserved
0
Reserved bit field. Do not write any value.
26
SRD
Software reset for SD_DAT line. This bit is set to 1 for reset and released to 0 when
completed .SD_DAT finite state machine in both clock domain are also reset.
These registers are cleared by the SD_SYSCTL[26] SRD bit:
• SD_DATA
• SD_PSTATEBRE, BWE, RTA, WTA, DLA and DATI
• SD_HCTLSBGR and CR
• SD_STATBRR, BWR, BGE and TC Interconnect is reinitialized.
NoteIf a soft reset is issued when an interrupt is asserted, data may be lost.
0
Reset completed
1
Software reset for SD_DAT line
25
SRC
Software reset for SD_CMD line. This bit is set to 1 for reset and released to 0 when completed.
SD_CMD finite state machine in both clock domain are also reset.
These registers are cleared by the SD_SYSCTL[25] SRC bit:
• SD_PSTATECMDI
• SD_STATCC Interconnect is reinitialized.
NoteIf a soft reset is issued when an interrupt is asserted, data may be lost.
0
Reset completed
1
Software reset for SD_CMD line
24
SRA
Software reset for all. This bit is set to 1 for reset , and released to 0 when completed. This reset
affects the entire host controller except for the card detection circuit and capabilities registers.
0
Reset completed
1
Software reset for all the design
23-20
Reserved
0
Reserved bit field. Do not write any value.
988
Secure Digital (SD)/—Secure Digital I/O (SDIO) Card Interface
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
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