![]() |
Altera SoCAL
16.0
The Altera SoC Abstraction Layer (SoCAL) API Reference Manual
|
Register 1 (Transmit Poll Demand Register)
The Transmit Poll Demand register enables the Tx DMA to check whether or not the DMA owns the current descriptor. The Transmit Poll Demand command is given to wake up the Tx DMA if it is in the Suspend mode. The Tx DMA can go into the Suspend mode because of an Underflow error in a transmitted frame or the unavailability of descriptors owned by it. You can give this command anytime and the Tx DMA resets this command when it again starts fetching the current descriptor from host memory. When this register is read, it always returns zero.
Register Layout
Bits | Access | Reset | Description |
---|---|---|---|
[31:0] | RW | 0x0 | ALT_EMAC_DMA_TX_POLL_DEMAND_TPD |
Field : tpd | |
Transmit Poll Demand When these bits are written with any value, the DMA reads the current descriptor pointed to by Register 18 (Current Host Transmit Descriptor Register). If that descriptor is not available (owned by the Host), the transmission returns to the Suspend state and the Bit 2 (TU) of Register 5 (Status Register) is asserted. If the descriptor is available, the transmission resumes. Field Access Macros: | |
#define | ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_LSB 0 |
#define | ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_MSB 31 |
#define | ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_WIDTH 32 |
#define | ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_SET_MSK 0xffffffff |
#define | ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_CLR_MSK 0x00000000 |
#define | ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_RESET 0x0 |
#define | ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_GET(value) (((value) & 0xffffffff) >> 0) |
#define | ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_SET(value) (((value) << 0) & 0xffffffff) |
Data Structures | |
struct | ALT_EMAC_DMA_TX_POLL_DEMAND_s |
Macros | |
#define | ALT_EMAC_DMA_TX_POLL_DEMAND_RESET 0x00000000 |
#define | ALT_EMAC_DMA_TX_POLL_DEMAND_OFST 0x1004 |
#define | ALT_EMAC_DMA_TX_POLL_DEMAND_ADDR(base) ALT_CAST(void *, (ALT_CAST(char *, (base)) + ALT_EMAC_DMA_TX_POLL_DEMAND_OFST)) |
Typedefs | |
typedef struct ALT_EMAC_DMA_TX_POLL_DEMAND_s | ALT_EMAC_DMA_TX_POLL_DEMAND_t |
struct ALT_EMAC_DMA_TX_POLL_DEMAND_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_EMAC_DMA_TX_POLL_DEMAND.
Data Fields | ||
---|---|---|
uint32_t | tpd: 32 | ALT_EMAC_DMA_TX_POLL_DEMAND_TPD |
#define ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_LSB 0 |
The Least Significant Bit (LSB) position of the ALT_EMAC_DMA_TX_POLL_DEMAND_TPD register field.
#define ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_MSB 31 |
The Most Significant Bit (MSB) position of the ALT_EMAC_DMA_TX_POLL_DEMAND_TPD register field.
#define ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_WIDTH 32 |
The width in bits of the ALT_EMAC_DMA_TX_POLL_DEMAND_TPD register field.
#define ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_SET_MSK 0xffffffff |
The mask used to set the ALT_EMAC_DMA_TX_POLL_DEMAND_TPD register field value.
#define ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_CLR_MSK 0x00000000 |
The mask used to clear the ALT_EMAC_DMA_TX_POLL_DEMAND_TPD register field value.
#define ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_RESET 0x0 |
The reset value of the ALT_EMAC_DMA_TX_POLL_DEMAND_TPD register field.
#define ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_GET | ( | value | ) | (((value) & 0xffffffff) >> 0) |
Extracts the ALT_EMAC_DMA_TX_POLL_DEMAND_TPD field value from a register.
#define ALT_EMAC_DMA_TX_POLL_DEMAND_TPD_SET | ( | value | ) | (((value) << 0) & 0xffffffff) |
Produces a ALT_EMAC_DMA_TX_POLL_DEMAND_TPD register field value suitable for setting the register.
#define ALT_EMAC_DMA_TX_POLL_DEMAND_RESET 0x00000000 |
The reset value of the ALT_EMAC_DMA_TX_POLL_DEMAND register.
#define ALT_EMAC_DMA_TX_POLL_DEMAND_OFST 0x1004 |
The byte offset of the ALT_EMAC_DMA_TX_POLL_DEMAND register from the beginning of the component.
#define ALT_EMAC_DMA_TX_POLL_DEMAND_ADDR | ( | base | ) | ALT_CAST(void *, (ALT_CAST(char *, (base)) + ALT_EMAC_DMA_TX_POLL_DEMAND_OFST)) |
The address of the ALT_EMAC_DMA_TX_POLL_DEMAND register.
typedef struct ALT_EMAC_DMA_TX_POLL_DEMAND_s ALT_EMAC_DMA_TX_POLL_DEMAND_t |
The typedef declaration for register ALT_EMAC_DMA_TX_POLL_DEMAND.