Preliminary
www.ti.com
Registers
9.4.9 Power Counter Register (SD_PWCNT)
This register is used to program a counter to delay command transfers after activating the PAD power,
this value depends on PAD characteristics and voltage. The power counter register (SD_PWCNT) is
shown in
and described in
Figure 9-37. Power Counter Register (SD_PWCNT)
31
16
15
0
Reserved
PWRCNT
R-0
R/W-0
LEGENDR/W = Read/Write; R = Read only; -n = value after reset
Table 9-19. Power Counter Register (SD_PWCNT) Field Descriptions
Bit
Field
Value
Description
31-16
Reserved
0
These bits are initialized to zero, and writes to them are ignored. Reads return 0.
15-0
PWRCNT
Power counter register. This register is used to introduce a delay between the PAD ACTIVE
pin assertion and the command issued.
0
No additional delay added
1h
TCF delay (card clock period)
2h
TCF x 2 delay (card clock period)
FFFEh
TCF x 65534 delay (card clock period)
FFFFh
TCF x 65535 delay (card clock period)
9.4.10 SDMA System Address (SD_SDMASA)
This register is used to program a counter to delay command transfers after activating the PAD power.
This value depends on PAD characteristics and voltage. The SDMA System address (SD_SDMASA) is
shown in
and described in
Figure 9-38. Card Status Response Error (SD_SDMASA)
31
0
SDMA_SYSADDR
R-0
LEGENDR/W = Read/Write; R = Read only; -n = value after reset
Table 9-20. Card Status Response Error (SD_SDMASA) Field Descriptions
Bit
Field
Value
Description
31-0
SDMA_SYSADDR
This register contains the system memory address for a SDMA transfer. When the Host
Controller stops a SDMA transfer, this register shall point to the system address of the next
contiguous data position. It can be accessed only if no transaction is executing (i.e., after a
transaction has stopped).
Read operations during transfers may return an invalid value. The Host Driver shall initialize this
register before starting a SDMA transaction. After SDMA has stopped, the next system address
of the next contiguous data position can be read from this register.
The SDMA transfer waits at the every boundary specified by the Host SDMA Buffer Boundary in
the Block Size register. The Host Controller generates DMA Interrupt to request the Host Driver
to update this register. The Host Driver sets the next system address of the next data position
to this register. When the most upper byte of this register (003h) is written, the Host Controller
restarts the SDMA transfer. When restarting SDMA by the Resume command or by setting
Continue Request in the Block Gap Control register, the Host Controller shall start at the next
contiguous address stored here in the SDMA System Address register. ADMA does not use this
register.
973
SPRUGX9 – 15 April 2011
Secure Digital (SD)/—Secure Digital I/O (SDIO) Card Interface
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
Страница 2: ...Preliminary 2 SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 92: ...92 Read This First SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 1122: ...1122 Multichannel Audio Serial Port McASP SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 1562: ...1562 Real Time Clock RTC SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 1658: ...1658 Timers SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 1750: ...1750 UART IrDA CIR Module SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 1984: ...1984 Universal Serial Bus USB SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...