Service manual

5-2 Samsung Electronics
MFP Controller consists of CPU(ARM7TDMI RISC processor), 2K-byte cache, data and address buses, serial
communication part with LIU(Line Interface Unit), print head controller, parallel port interface, external
DMA part to receive data from external color image processor (CIPIA:U17), LF/CR motor diver controller and
I/O controller.
5-1-2-1. SYSTEM CLOCK
The internal clock frequency is 30MHz. 30MHz system clock (MCLK) supplied from the outside is used with-
out being divided inside.
5-1-2-2. DATA & ADDRESS BUS CONTROL
¥ /RD & /WR
/RD & /WR signals are synchronized with MCLK(30MHz) and become LOW ACTIVE.
These signals are strobe signals used to read and write data when each CHIP SELECT is connected with
/RD and /WR pin of RAM, ROM, MODEM and the outside devices and becomes active.
¥ CHIP SELECT (/CSO, /ROMCS, /MCS)
- /IP-CS : CIP1A(U17) CHIP SELECT (LOW ACTIVE)
- /ROMCS : ROM/FLASH MEMORY(U10) CHIP SELECT (LOW ACTIVE)
- /MCS : MODEM(U21) CHIP SELECT (LOW ACTIVE)
When each CHIP SELECT is low, data can be read or written.
¥ D0 - D15
- 16bit data bus
¥ A0 - A17
- ADDRESS BUS (A18 - A21 are reserved.)
5-1-2 MFP CONTRLLER (KS32C6200 : U15)