OKIFAX 610, Service Handbook, Page: 110 / 147

Table 8.1.1-1 XFC Pin Functions
Pin Name Pin No. I/O Input
Type
Output
Type
Pin Description
(Note: Active low signals have an “ n ” pin name
endlng.)
CPU Control Interface
MIRQn 135 I HU -- Modem interrupt, active low. (Hysteresis In, Internal
Pullup.)
SYSCLK 133 I H -- System clock. (Hysteresis In.)
TSTCLK 130 O -- 3XC Test clock.
Bus Control Interface
A[23:0] [1:6][8:13]
[15:20][22:27] O T 3XT Address bus (24-bit)
D[7:0] [136:139]
[141:144] I/O T 3XT Data bus (8-bit)
RDn 128 O -- 3XTT Read strobe.
WRn 127 O -- 3XTT Write strobe.
ROMCSn 120 O -- 2XT ROM chip select.
CS1n 122 O -- 2XT I/O chip select.
CS0n 57 O -- 2XTT SRAM chip select. (Battery powered.)
MCSn 121 O -- 2XC Modem chip select.
SYNC 126 O -- 2XC Indicates CPU op code fetch cycle (active high).
REGDMA 124 O -- 3XC Indicates REGSEL cycle and DMA cycle.
WATTn 125 O -- 3XC Indicates current TSTCLK cycle is a wait state or a halt
state.
RASn 113 O -- 3XTT DRAM row address select. (Battery powered).
CAS[2:0]N [110:112] O -- 2XTT DRAM column address select. (Battery powered.)
DWRn 109 O -- 3XTT DRAM writ. (Battery powered.)
Prime Power Reset Logic and Test
DEBUGn 129 I HU -- Ecternal non-maskable input (NMI).
RESETn 131 I/O HU 2XO XFC Rest.
TEST 58 I C -- Sets Test mode (battery powered).
Battery Power Control and Reset Logic
XIN 59 I OSC -- Crystal oscillator input pin.
XOUT 60 O -- OSC Crystal oscillator output pin.
PWRDWNn 62 I H -- Indicates loss if prime power (results in NMI).
BATRSTn 61 I H -- Battery power reset input.
Scanner Interface
START 101 O -- 2XS Scanner shift gate control.
CLK1 100 o -- 2xs Scanner clock.
CLK1n 99 O -- 2XS Scanner clock-inverted.
CLK2 98 O -- 2XS Scanner reset gate control (or clock for CIS scanner).
VIDCTL[1:0] [97:96] O -- 2XC Control for video preprocessing circuits.
Printer Interface
PCLK/DMAACK 29 O -- 3XC Thermal Print Head (TPH) clock or external DMAACK.
PDAT 30 O -- 2Xp Serial printing data (to TPH).
PLAT 31 o -- 3xp TPH data latch.
STRB[3:0] [33:36] O -- 1XP Strobe signals for the TPH.
STRBPOL/D
MARQ 37 I C -- Sets strobe polarity, active high/low., or external
DMAREQ.