Xerox WorkCentre Pro 412 Service Manual page 38

Circuit Description
5-2-5 Dram Control
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 reading. You can
expand up to 64MBYTE of DRAM in this system.
bank3 Next
bank3 Bas e
bank2 Next
bank2 Bas e
bank1 Next
bank1 Bas e
bank0 Next
bank0 Bas e
5-12
K4E6411D EDO type
4Mbytes (1M*16BITS*2)
DRAM Bank Configuration
August 2001
0xf f f f f f f
0x0000000
WorkCentre Pro 412
Launch Issue