求DSP 6747与FPGA用EMIF 通信例程

供参考

Code Segment

The following code segment sets up the EMIF as described above using the

TMS320C6000 Peripheral Runtime Support Control Library.

#include <emif.h>

.

. /*OTHER USER CODE*/

.

/* Get default values for all EMIF registers */

unsigned int g_ctrl = GET_REG(EMIF_GCTRL)

unsigned int ce0_ctrl = GET_REG(EMIF_CE0_CTRL)

unsigned int ce1_ctrl = GET_REG(EMIF_CE1_CTRL)

unsigned int ce2_ctrl = GET_REG(EMIF_CE2_CTRL)

unsigned int ce3_ctrl = GET_REG(EMIF_CE3_CTRL)

unsigned int sdram_ctrl = GET_REG(EMIF_SDRAM_CTRL)

unsigned int sdram_ref = GET_REG(EMIF_SDRAM_REF)

/* Set Global Control - Enable CLKOUT2,SDCLK, and SSCLK*/

/*- Disable CLKOUT1 */

/* - Set for ½x SBSRAM interface */

RESET_BIT(&g_ctrl, SSCRT)

SET_BIT(&g_ctrl, CLK2EN)

RESET_BIT(&g_ctrl, CLK1EN)

SET_BIT(&g_ctrl, SSCEN)

SET_BIT(&g_ctrl, SDCEN)

/* Configure CE2 as SBSRAM */

LOAD_FIELD(&ce2_ctrl ,MTYPE_32SBSRAM, MTYPE , MTYPE_SZ )

/* Store EMIF Control Registers */

emif_init(g_ctrl, ce0_ctrl, ce1_ctrl, ce2_ctrl, ce3_ctrl,

sdram_ctrl, sdram_ref)

.

. /*OTHER USER CODE*/

.

不行。EMIF接口固定DSP为主设备，也就是说，FPGA在EMIF接口上只能作为从设备。只能主设备主动发起对从设备的访问，反过来是不行的。

如果想FPGA能主动访问DSP，可以使用DSP的HPI口。在HPI接口上，DSP是从设备。

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