sdram_init.asm

ADSP-BF53３视频输出程序

/*****************************************************************************
**																			**
**	 Project Name: 	Video_Output											**	
**																			**
******************************************************************************

(C) Copyright 2003 - Analog Devices, Inc.  All rights reserved.

File Name:		sdram_init.asm

Date Modified:	4/4/03		CL		Rev 1.0

Software:       VisualDSP++3.1

Hardware:		ADSP-BF533 EZ-KIT Board

Special Connections:  None

Purpose:		This sdram_init.asm file sets up the SDRAM registers for
				SDRAM memory accesses.
				
******************************************************************************/


#include "defBF533.h"

.section L1_code;
.global setup_sdram;


setup_sdram:
	
	/* Check whether SDRAM is enabled already.  If so, jump to done.
	   If not, continue with configurations.  */
	
	P0.L = EBIU_SDSTAT & 0xffff;
	P0.H = EBIU_SDSTAT >> 16;
	R2.L = W[P0];								
	CC = BITTST(R2,3);
	IF !CC JUMP done;

	/* Initalize SDRAM registers. */

	//SDRAM Refresh Rate Control Register
	P0.L = EBIU_SDRRC & 0xffff;
	P0.H = EBIU_SDRRC >> 16;
	R0.L = 0x0817;								
	W[P0] = R0.L;

	//SDRAM Memory Bank Control Register
	P0.L = EBIU_SDBCTL & 0xffff;			
	P0.H = EBIU_SDBCTL >> 16;					
	R0.L = 0x0013;								
	W[P0] = R0.L;

	//SDRAM Memory Global Control Register	
	P0.L = EBIU_SDGCTL & 0xffff;
	P0.H = EBIU_SDGCTL >> 16;
	R0.L = 0x998d;
	R0.H = 0x0091;
	[P0] = R0;	
	
done:	
	RTS;
	
	
setup_sdram.END: