Samsung SF-830 Service Manual page 134

3-2-5-3 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
Samsung Electronics
wait
r ow address
Trp
Trc
<EDO Read Timing Diagram>
wait dat a
dat a
column
column
data 0
data 1
Tcas Tcas
CIRCUIT DESCRIPTION
Repair Manual
3-15