Xerox WorkCentre Pro 412 Service Manual page 69

5-3-6 Dram Control (WorkCentre Pro 412 & FaxCentre F12)
1) Device
Type No.
Capacity
2) Operating Principle
DRAM can either read or write. The data can be stored in the DRAM only when the power is on. It stores
data white the CPU processes data. The address to read and write the data is specified by RAS SIGNAL
and CAS SIGNAL.DRAMWE*SIGNAL is activated when writing data and DRAMOE*SIGNAL, when read-
ing. You can expand up to 64MBYTE of DRAM in this system.
1) Device (WorkCentre M15/M15i)
TYPE NO.
CAPACITY
WorkCentre Pro 412, FaxCentre F12 &
WorkCentre M15/M15i
K4E6411D EDO type
4Mbytes (1M*16BITS*2)
DRAM Bank Configuration
K4S
16MBYTES (1M * 16BITS * 4Bank * 2)
3/03
Circuit Description
5-31