Preliminary
Registers
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9.4.8 Configuration Register (SD_CON)
This register is used:
•
To select the functional mode for any card
•
To send an initialization sequence to any card
•
To send an initialization sequence to any card
•
To enable the detection on the SD_DAT1signal of a card interrupt for SDIO cards only
It also configures:
•
The parameters related to the card detect and write protect input signals
The configuration register (SD_CON) is shown in
and described in
.
Figure 9-36. Configuration Register (SD_CON)
31
24
Reserved
R-0
23
22
21
20
19
18
17
16
Reserved
SDMA_LnE
DMA_MnS
DDR
BOOT_CF0
BOOT_ACK
CLKEXTFREE
R-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
15
12
11
10
9
8
Reserved
CTPL
DVAL
WPP
R-0
R/W-0
R/W-3h
R/W-0
7
6
5
4
3
2
1
0
CDP
Reserved
MODE
Reserved
INIT
Reserved
R/W-0
R-0
R/W-0
R-0
R/W-0
R-0
LEGENDR/W = Read/Write; R = Read only; -n = value after reset
Table 9-18. Configuration Register (SD_CON) Field Descriptions
Bit
Field
Value
Description
31-22
Reserved
0
Reserved bit field. Do not write any value.
21
SDMA_LnE
Slave DMA Level/Edge Request. The waveform of the DMA request can be configured either
edge sensitive with early de-assertion on first access to SD_DATA register or late
de-assertion, request remains active until last allowed data written into SD_DATA.
0
Slave DMA edge sensitive.
1
Slave DMA level sensitive.
20
DMA_MnS
DMA Master or Slave selection. When this bit is set and the controller is configured to use the
DMA, Ocp master interface is used to get datas from system using ADMA2 procedure (direct
access to the memory).
This option is only available if generic parameter MADMA_EN is asserted to 1.
0
The controller is slave on data transfers with system.
1
Not available on this device.
19
DDR
Dual Data Rate mode. When this register is set, the controller uses both clock edge to emit or
receive data. Odd bytes are transmitted on falling edges and even bytes are transmitted on
rise edges. It only applies on Data bytes and CRC, Start, end bits and CRC status are kept full
cycle. This bit field is only meaningful and active for even clock divider ratio of
SD_SYSCTL[CLKD], it is insensitive to SD_HCTL[HSPE] setting
0
Standard modeData are transmitted on a single edge.
1
Data Bytes and CRC are transmitted on both edges.
970
Secure Digital (SD)/—Secure Digital I/O (SDIO) Card Interface
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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