Canon Super G3 Fax Board-J1 Service Manual page 21

CHAPTER 2 BASIC OPERATION
5 Signals
G3 fax control PCB (J31)¬ ®Main controller PCB (J1005)
J31 J105 signal
A1 A20 FSTROBE
A2 A19 FD0
A3 A18 FD1
A4 A17 FD2
A5 A16 FD3
A6 A15 FD4
A7 A14 FD5
A8 A13 FD6
A9 A12 FD7
A10 A11 FNACK
A11 A10 FBUSY
A12 A9 FPERROR
A13 A8 FSELECT
A14 A7 FRESET
A15 A6 FOPTIONO
A16 A5 NC
A17 A4 NC
A18 A3 GND
A19 A2 FSPKON
A20 A1 HPDIR
B1 B20 PWCTL
B2 B19 CICNT
B3 B18 NC
B4 B17 ESSACT
B5 B16 FSPOUT
B6 B15 GND
B7 B14 FCID
B8 B13 FOFFHK
A9 B12 BUSDIR
B10 B11 NC
B11 B10 NC
B12 B9 NC
B13 B8 GND
B14 B7 GND
B15 B6 GND
B16 B5 GND
B17 B4 FNSELECT IN 1284 active (H=ECP mode)
B18 B3 FNINT
B19 B2 FNFAULT
B20 B1 FNAUTOFD
2-6
COPYRIGHT © 2001 CANON INC.
Description
host clock
data signal 0
data signal 1
data signal 2
data signal 3
data signal 4
data sing 5
data signal 6
data signal 7
peripheral clock
forward ACK signal
reverse ACK signal
transfer mode switch signal (H=ECP mode)
forced reset signal
board detection signal (H=present)
not used
not used
3.3V ground
speaker ON (L=being generated)
not used
ESS release command signal to fax board (L=ESS release)
pseudo CI control signal
not used
ESS release request signal (L=ESS release) for G4
line monitor analog output
3.3V ground
CI/FC/CNG detection signal
OFFHOOK signal
bus direction control signal to HOST
not used
not used
not used
3.3V ground
3.3V ground
3.3V ground
3.3V ground
nReverse request
nPeripheral request (L= data from peripheral present)
reverse mode control signal
2000 2000 2000 2000 CANON SUPER G3 FAX BOARD-J1 REV.0 JUNE 2001