Sun Microsystems Sun Ultra 60 Service Manual page 174

TABLE B–6
Pin
1
2 to 9
10
11
12
13
14
Sun Ultra 60 Service Manual ♦ March 1999, Revision A
B-12
Parallel Port Connector Pin Assignments
Mnemonic
Data_Strobe_L
Data[0..7]
ACK_L
BUSY
PERROR
SELECT_L
AFXN_L
Signal Name Description
Data Strobe Set low during forward channel
Low transfers to latch data into
peripheral device. Set high during
reverse channel transfers.
Data0 Thru The main data bus for the parallel
Data7 port. Data0 is the least significant
bit (LSB). Are not used during
reverse channel transfers.
Acknowledge Driven low by the peripheral
Low device to acknowledge data byte
transfer from host during forward
channel transfer. Qualifies data
being transferred to host in reverse
channel transfer.
Busy Driven high to indicate the
peripheral device is not ready to
receive data during forward
channel transfer. Used to send
Data3 and Data7 during reverse
channel transfer.
Parity Error Driven high by peripheral device to
indicate an error in the paper path
during forward channel transfer.
Used to send Data2 and Data6
during reverse channel transfer.
Select Low Indicates the peripheral device is
on-line during forward channel
transfer. Used to send Data1 and
Data5 during reverse channel
transfer.
Auto Feed Low Set low by the host to drive the
peripheral into auto-line feed mode
during forward channel transfer.
During reverse channel transfer, set
low to indicate host can receive
peripheral device data and then set
high to acknowledge receipt of
peripheral data.