I ask you about SPORT DDR Mode. | Cypress Semiconductor
I ask you about SPORT DDR Mode.
First of all, I'm using MMC CARD and I'm trying to change operation mode from sdr to ddr on SPORT0 in fx3s chip.
I set DDR 8bit Mode at SPORT0 and I send Write Command(CMD25) and Write Data, But Device be reported Write CRC Fail. I check signal Line as Command Line , Data Line and Clock Line. I can know Host Problem.
When DDR mode, Host should drive Signal as below.(refer to eMMC 4.41)
DATA0 X START X D0 X D1 X
but your host drive signal as below
DATA0 -- FF X START X D0 X D1 X
Accoding to spec, Clock should be high during start region. but your device is not.
I checked your spec(fx3 trm), but I can't find out SFR option about OUT PUT Delay.
Can I get Some information?