Hello,
i am using an ADSP-BF523 and an Elite SDRAM M12L64164A-5BIG2Y.
The external busclock is 100MHz and the SDRAM-Timings are:
*pEBIU_SDRRC = 0x612;
*pEBIU_SDBCTL = EBCAW_8 | EBSZ_16 | EBE;
*pEBIU_SDGCTL = PSS | TWR_2 | TRCD_2 | TRP_2 | TRAS_6 | CL_2 | SCTLE;
Sometimes the Memory-Access is corrupted and wrong Data is read from the SDRAM-Device.
If i use the 200ps OUTPUT-DELAY-Option in the PLL control register the access succeeds.
Is the Elite Ram compatible to the BF523?
Are the setup and hold times calculated like this?
for data to sdram:
setup: tSCLK-tDCAD = 10ns - 4ns = 6ns
hold: tHCAD = 1ns
for data from sdram:
setup: tSSDAT = 1.5ns
hold: tHSDAT = 0.8ns
In ee326 page 9 there is tHSDAT mentioned for write to SDRAM.
I think this timing parameter is for reading from sdram.
Can you please explain this.
Whitch signals are affected by the OUTPUT-DELAY and INPUT-DELAY Option in the PLL control register.
Is this an option just for SDRAM-controller or for the async-controller too?
Thanks
Bernhard
