Xerox WorkCentre 385, Service Manual

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WorkCentre 385
12/98
7 - 8
Circuit Description
MFP Controller (KS32C6100: U1)
SYSTEM CLOCK
The internal clock frequency is 33MHz 66MHz
system clock (MCLK) supplied from the outside is
used being divided inside.
DATA & ADDRESS BUS CONTROL
• /RD & /FMEM_WR, /WR/RD & /FMEM_WR
signals are synchronized with MCLK(33MHz)
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. /WR is strobe signal used
only write signal for SCAM image processor.
• CHIP SELECT (/SDIP_CS, /RCS0, /RCS2, /
MCS, /SCS
- /SDIP_CS: SCAN MEMORY CHIP SELECT
(LOW ACTIVE)
- /RCS0: FLASH MEMORY CHIP SELECT
(LOW ACTIVE)
- /RCS2: MASK ROM CHIP SELECT (LOW
ACTIVE)
- /MCS: MODEM CHIP SELECT (LOW
ACTIVE)
- /SCS: SRAM CHIP SELECT (LOW
ACTIVE)
• D0 - D31
- 32bit data bus
• A0 - A23
- ADDRESS BUS (A22 - A23 are reserved.)
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