Hi,
I suspect there are ISI and overclocking issue in the IBIS model.
I would recommend to check output slew rate of NAND Tx buffer.
According to ONFI 4.0 spec., the minimum output slew rate is 1.0V/nsec for
overdrive2(18 Ohm), but it is little slow for 667Mbps NV-DDR2.
I think it should be at least more than 2 V/nsec for 667Mbps.
I hope this helps...
Regards,
Keeyoung
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Mallikarjun K
Sent: Tuesday, April 19, 2016 4:40 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Regarding NAND Flash DQS signal amplitude difference during
Read & Write
Hi,
We are using NAND flash in nv-DDR2 mode. Operating at maximum data rate of
333MT/s (Clock frequency :166Mhz).
During Our DVT, we found that During Read Operation the DQS differential signal
amplitude is *less than* when WRITE operation.
WRITE operation pk-pk ~ 3.8V
READ operation pk-pk ~ 3.2V (that too negative side swing is less)
Signal quality is good in both cases.
We are capturing signals near to NAND Flash always.
Any thoughts on this.,
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