Xerox WorkCentre Pro 412 Service Manual page 41

5-2-5-3 EDO DRAM Read Timing
Basically the Extended Data Out DRAM is similar to Fast Page Mode DRAM. For FPM, the data are valid only
when the nCAS is active while reading the internal data, however, it has a latch that the data will be
continuously outputted even after the nCAS is inactivated.
While configuring the software, you must set the timing register of SFR considering the clock speed and the
DRAM spec.
addr
5Mhz
MCLK
nRAS
nCAS
DRAMA
nOE
nWE
DRAMD
WorkCentre Pro 412
Launch Issue
wait
r ow address
Trp
Trc
EDO Read Timing Diagram
August 2001
wait dat a
dat a
column column
data 0
data 1
Tcas Tcas
Circuit Description
5-15