Hello
I am interfacing AT89C52 with DP RAM IDT7130.
I wrote a simple program for writing on to five location.
DP ram has the flowwing control lines
CE_(active low), R/W_(WRITE active low,READ active high),
BUSY_(active low),INT_(active low),OE_(active low)
and the rest are address and data lines on both side.
i have connected AT89C52 on only right side of DP RAM , while the other side is left floating.
The control lines are as connected:
CE_ ---- i toggle it using p3.2
R/W_ ---- connected to WR_ of 8051
busy_ --- floating
INT_ ---- floating
OE_ ---- conected to RD_ of 8051

however when i write to RAM using movx @dptr,a
i dont get a low signal on WR_ of 8051 ,so no question of writing to DP RAM. I have checked the WR_ signal on storage oscilloscope at 250 nsec.

what may be the problem.

Thanks,
Pravin