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Altera SoCAL
16.0
The Altera SoC Abstraction Layer (SoCAL) API Reference Manual
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Selects among available clock dividers. The sdmmc_cclk_out is always from clock divider 0.
Register Layout
Bits | Access | Reset | Description |
---|---|---|---|
[1:0] | RW | 0x0 | Clock Source |
[31:2] | ??? | 0x0 | UNDEFINED |
Field : Clock Source - clk_source | |||||||
Selects among available clock dividers. The SD/MMC module is configured with just one clock divider so this register should always be set to choose clkdiv0. Field Enumeration Values:
Field Access Macros: | |||||||
#define | ALT_SDMMC_CLKSRC_CLK_SRC_E_CLKDIV0 0x0 | ||||||
#define | ALT_SDMMC_CLKSRC_CLK_SRC_LSB 0 | ||||||
#define | ALT_SDMMC_CLKSRC_CLK_SRC_MSB 1 | ||||||
#define | ALT_SDMMC_CLKSRC_CLK_SRC_WIDTH 2 | ||||||
#define | ALT_SDMMC_CLKSRC_CLK_SRC_SET_MSK 0x00000003 | ||||||
#define | ALT_SDMMC_CLKSRC_CLK_SRC_CLR_MSK 0xfffffffc | ||||||
#define | ALT_SDMMC_CLKSRC_CLK_SRC_RESET 0x0 | ||||||
#define | ALT_SDMMC_CLKSRC_CLK_SRC_GET(value) (((value) & 0x00000003) >> 0) | ||||||
#define | ALT_SDMMC_CLKSRC_CLK_SRC_SET(value) (((value) << 0) & 0x00000003) | ||||||
Data Structures | |
struct | ALT_SDMMC_CLKSRC_s |
Macros | |
#define | ALT_SDMMC_CLKSRC_OFST 0xc |
Typedefs | |
typedef struct ALT_SDMMC_CLKSRC_s | ALT_SDMMC_CLKSRC_t |
struct ALT_SDMMC_CLKSRC_s |
WARNING: The C register and register group struct declarations are provided for convenience and illustrative purposes. They should, however, be used with caution as the C language standard provides no guarantees about the alignment or atomicity of device memory accesses. The recommended practice for writing hardware drivers is to use the SoCAL access macros and alt_read_word() and alt_write_word() functions.
The struct declaration for register ALT_SDMMC_CLKSRC.
Data Fields | ||
---|---|---|
uint32_t | clk_source: 2 | Clock Source |
uint32_t | __pad0__: 30 | UNDEFINED |
#define ALT_SDMMC_CLKSRC_CLK_SRC_E_CLKDIV0 0x0 |
Enumerated value for register field ALT_SDMMC_CLKSRC_CLK_SRC
Clock divider 0
#define ALT_SDMMC_CLKSRC_CLK_SRC_LSB 0 |
The Least Significant Bit (LSB) position of the ALT_SDMMC_CLKSRC_CLK_SRC register field.
#define ALT_SDMMC_CLKSRC_CLK_SRC_MSB 1 |
The Most Significant Bit (MSB) position of the ALT_SDMMC_CLKSRC_CLK_SRC register field.
#define ALT_SDMMC_CLKSRC_CLK_SRC_WIDTH 2 |
The width in bits of the ALT_SDMMC_CLKSRC_CLK_SRC register field.
#define ALT_SDMMC_CLKSRC_CLK_SRC_SET_MSK 0x00000003 |
The mask used to set the ALT_SDMMC_CLKSRC_CLK_SRC register field value.
#define ALT_SDMMC_CLKSRC_CLK_SRC_CLR_MSK 0xfffffffc |
The mask used to clear the ALT_SDMMC_CLKSRC_CLK_SRC register field value.
#define ALT_SDMMC_CLKSRC_CLK_SRC_RESET 0x0 |
The reset value of the ALT_SDMMC_CLKSRC_CLK_SRC register field.
#define ALT_SDMMC_CLKSRC_CLK_SRC_GET | ( | value | ) | (((value) & 0x00000003) >> 0) |
Extracts the ALT_SDMMC_CLKSRC_CLK_SRC field value from a register.
#define ALT_SDMMC_CLKSRC_CLK_SRC_SET | ( | value | ) | (((value) << 0) & 0x00000003) |
Produces a ALT_SDMMC_CLKSRC_CLK_SRC register field value suitable for setting the register.
#define ALT_SDMMC_CLKSRC_OFST 0xc |
The byte offset of the ALT_SDMMC_CLKSRC register from the beginning of the component.
typedef struct ALT_SDMMC_CLKSRC_s ALT_SDMMC_CLKSRC_t |
The typedef declaration for register ALT_SDMMC_CLKSRC.