(Nibble mode)
/AUTOFD
HOST
PRINTER
0~35ms
0~1s
/INTR
Low
Clr
DELAY
On
Interrupt
/ACK
Low
High
/ACK
HIgh
DELAY
On
BUSY
/FAULT
SELECT
0~35ms
Low
/ACK
High
PE
Low
/AUTOFD
/AUTOFD
0~1s
Transfer
LOW at send ready
LOW at send ready
The last negotiation value
Forward channel value
With delay on, 500ns timer is on.
Control of PE and /Fault is set with
the hardware.
With delay on, 500ns timer is on.
Send data is set with software
depending on PE, /Fault, SELECT,
and BUSY.
HOST
PRINTER
0~35ms
min0.5µs
PE
Low
Devalid
On
DELAY
On
Low
/FAULT
/ACK
High
Low
/ACK
/AUTOFD
High
Reverse request
ON when sending is allowed.
With delay on, 500ns timer is on.
When the request is detected, AutoFd
is driven to HIGH.
SHARP SERVICE MANUAL JX8200SM [13] ELECTRICAL SECTION
13 – 25