emi max speed?

[gxliu]

Posted on June 24, 2007 at 05:04

emi max speed?

[gxliu]

Posted on May 17, 2011 at 09:44

In my project, I need read a external fifo, when I set the mcu at 96Mhz, with the emi non buffer mode cs0(address 0x3c000000-), the access speed is only 3.2MHz, who could help me for more?

Thanks.

[gxliu]

Posted on May 17, 2011 at 09:44

Because the maxium External Memory Bus clock is 66Mhz, I set the pll at 66Mhz, and fBCLK=fHCLK=fCPUCLK=fMSTR=66Mhz, Peripheral Clock for APB fPCLK=33Mhz, but the external access speed is still 3.0Mhz, why? who could help me?

[gxliu]

Posted on May 17, 2011 at 09:44

Now the fast speed of 8bit non mux mode emi I get is 9.6MHz.

:)

[gxliu]

Posted on May 17, 2011 at 09:44

For 8bit nonmux mode, with 66MHz PLL, I get 4MHz EMI CS0 access speed. and 8MHz EMI CS0 access speed with 96MHz PLL.

the test code:

__asm

{

TSTLP:

MOV R0,#0x3C000000

LDRB R0,[R0]

B TSTLP

}