CLKSRC
Clock Source Register
| Module Instance | Base Address | Register Address |
|---|---|---|
| i_sdmmc_sdmmc_block_1 | 0xFF8D1000 | 0xFF8D100C |
Size: 32
Offset: 0xC
Access: RW
Important: The value of a reserved bit must be maintained in software. When you modify registers containing reserved bit fields, you must use a read-modify-write operation to preserve state and prevent indeterminate system behavior.
| Bit Fields | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
|
CARD15_CLK_SOURCE RO 0x0 |
CARD14_CLK_SOURCE RO 0x0 |
CARD13_CLK_SOURCE RO 0x0 |
CARD12_CLK_SOURCE RO 0x0 |
CARD11_CLK_SOURCE RO 0x0 |
CARD10_CLK_SOURCE RO 0x0 |
CARD9_CLK_SOURCE RO 0x0 |
CARD8_CLK_SOURCE RO 0x0 |
||||||||
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|
CARD7_CLK_SOURCE RO 0x0 |
CARD6_CLK_SOURCE RO 0x0 |
CARD5_CLK_SOURCE RO 0x0 |
CARD4_CLK_SOURCE RO 0x0 |
CARD3_CLK_SOURCE RO 0x0 |
CARD2_CLK_SOURCE RO 0x0 |
CARD1_CLK_SOURCE RO 0x0 |
CARD0_CLK_SOURCE RO 0x0 |
||||||||
CLKSRC Fields
| Bit | Name | Description | Access | Reset | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 31:30 | CARD15_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 29:28 | CARD14_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 27:26 | CARD13_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 25:24 | CARD12_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 23:22 | CARD11_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 21:20 | CARD10_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 19:18 | CARD9_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 17:16 | CARD8_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 15:14 | CARD7_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 13:12 | CARD6_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 11:10 | CARD5_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 9:8 | CARD4_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 7:6 | CARD3_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 5:4 | CARD2_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 3:2 | CARD1_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 | ||||||||||
| 1:0 | CARD0_CLK_SOURCE |
Clock divider source for up to 16 SD cards supported. Each card has two bits assigned to it. For example, bits[1:0] assigned for card-0, which maps and internally routes clock divider[3:0] outputs to cclk_out[15:0] pins, depending on bit value.
00 Clock divider 0
01 Clock divider 1
10 Clock divider 2
11 Clock divider 3
In MMC-Ver3.3-only controller, only one clock divider supported. The cclk_out is always from clock divider 0, and this register is not implemented.
|
RO | 0x0 |