lib_sdramc.h

ARM9200开发板的ROM boot程序源码1.0

//*----------------------------------------------------------------------------
//*         ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : lib_sdramc.h
//* Object              : SDRAMC Library Function Prototyping File.
//*
//* 1.0 01/02/01 ED     : Creation
//*----------------------------------------------------------------------------

#ifndef lib_sdramc_h
#define lib_sdramc_h

#include    "periph/stdc/std_c.h"
//* #include    "periph/memc/memc.h"
#include    "periph/sdramc/sdramc.h"
#include	"drivers/wait/wait.h"

/*----------------------------------------*/
/* SDRAMC Descriptor Structure Definition */
/*----------------------------------------*/

typedef struct
{
    StructSDRAMC	*sdramc_base ;		/* Peripheral base */
    u_char			periph_id ;			/* SDRAMC Peripheral Identifier */
} SdramcDesc ;

typedef struct
{
    u_int			tref ;				/* Refresh Period in us */
    u_int       	col_nb ;			/* SDRAM device column number */
    u_int       	row_nb ;			/* SDRAM device row number */
    u_int       	bank_nb ;			/* SDRAM device bank number */
    u_int       	cas_latency ;		/* SDRAM device CAS latency */
    u_int       	twr ;				/* Write recovery time in ns */
    u_int       	trc ;				/* Refresh to activate command time in ns */
    u_int       	trp ;				/* Precharge command to another command time in ns */
    u_int       	trcd ;				/* Activate command to read/write command time in ns */
    u_int       	tras ;				/* Activate command to Precharge command time in ns */
    u_int       	txsr ;				/* CKE high to Activate command time in ns */
    u_int			burst_length ;		/* SDRAM Burst Length programmation in Mode Register */
    u_int			burst_type ;		/* SDRAM Burst Type programmation in Mode Register */
    u_int       	data_bus_width ;	/* Data-path width (16 or 32 bits) */
} ParamSdramDesc ;

/* Time constants definition */
#define		WAIT_1MS		1000
#define		WAIT_200US		200
#define		WAIT_100US		100

/* Function Prototyping */
extern void at91_sdramc_open ( const SdramcDesc *sdramc_desc, ParamSdramDesc *sdram_desc,
								u_int *base_address, WaitDesc *wait_desc ) ;
extern void at91_sdramc_close ( const SdramcDesc *sdramc_desc ) ;
extern void at91_sdramc_trig_cmd ( const SdramcDesc *sdramc_desc, u_int cmd ) ;
extern u_int at91_sdramc_get_status ( const SdramcDesc *sdramc_desc ) ;

#endif     /* lib_sdramc_h */