Nibble Mode - Fujitsu DL3800 User Manual

INTERFACE INFORMATION
D-4

Nibble Mode

Pin numbers 2 to 9, 15 to 31, and 33 to 35 are the same as the conven-
tional mode.
Pin Return Signal
No. Pin No. name
1 19 Host Clock
10 28 Printer Clock
11 29 Printer Busy
12 30 Ack Data Req Output Reverse data transfer phase:
13 – X Flag
Direc- Description
tion
Input This signal is set high when
the host requests the reverse
data transfer phase (nibble
mode).
Output Reverse data transfer phase:
This signal goes high when
data being sent to the host is
established.
Reverse idle phase:
This signal is set low then
goes high to interrupt the
host, indicating that data is
available.
Output Reverse data transfer phase:
Data bit 3, data bit 7, then
forward path (host to printer)
busy status
Data bit 2, then data bit 6
Reverse idle phase:
This signal is set high until the
host requests data and, after
that, follows the Data Available
signal.
Output Reverse data transfer phase:
Data bit 1, then data bit 5
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