mac_low.h

此文档为采用FPGA实现的以太网MAC层

#include "sys.h"


//Defines for Uint32 variables to access EMAC
#define EMAC_MODE *((volatile Uint32 *) Base_EMAC)
#define EMAC_INT_SRC *((Uint32 *) (Base_EMAC+4))
#define EMAC_INT_MASK *((Uint32 *) (Base_EMAC+8))
#define EMAC_IPGT *((Uint32 *) (Base_EMAC+0xC))
#define EMAC_TXBDNUM *((Uint32 *) (Base_EMAC+0x20))
#define EMAC_MACADDR0 *((Uint32 *) (Base_EMAC+0x40))
#define EMAC_MACADDR1 *((Uint32 *) (Base_EMAC+0x44))

typedef struct
{
    Uint32 reg;
    Uint32 buffer_address;
} BD_TYPE;

//Struct pointer to start of TX Buffer descriptors
//Must be indexed into to access
#define EMAC_TXBD_PTR ((BD_TYPE *) (Base_EMAC+0x400))
#define BD_SIZE sizeof(BD_TYPE)

//Maximum number of TX Buffer descriptors (max 0x80)
#define TXBDNUM 0x40
//total number of used BD
#define RXBDCOUNT 16
//Size of each BD in ram
#define RXBDSIZE ((EMAC_RAM_SIZE/2)/RXBDCOUNT)

//Struct pointer to start of RX Buffer descriptors
//Must be indexed into to access
#define EMAC_RXBD_PTR ((BD_TYPE *) (Base_EMAC+0x400+(sizeof(BD_TYPE)*TXBDNUM)))

//Pointer to RAM contents
#define EMAC_RAM_PTR (Base_EMAC_RAM)
#define EMAC_TX_OFFSET 0

//Defines size of RAM in bytes - RX buffer will start halfway
#define EMAC_RAM_SIZE 0x4000

//TX Pointer is start of ram
#define EMAC_TX_PTR (EMAC_RAM_PTR+EMAC_TX_OFFSET)


#define EMAC_RX_OFFSET (EMAC_RAM_SIZE/2)
#define EMAC_RX_PTR (Base_EMAC_RAM+EMAC_RX_OFFSET)

void mac_low_init(void);
void mac_set_address(Uint8 *mac_address);
void mac_txen(void);
void mac_rxen(void);
void mac_clr_rxint(void);
void mac_rxint_en(void);
void mac_rxint_dis(void);
void mac_set_address(Uint8 *mac_address);
void mac_set_len(Uint8 bdnum,Uint16 data_len) ;
void mac_clr_rxbd(Uint8 bdnum);
void mac_setbdaddr(Uint8 bdnum,Uint16 address);
Uint32 mac_getbdaddr(Uint8 bdnum);
void mac_setwr(Uint8 bdnum);