Sun Microsystems enterprise server 220r User Manual
Appendix A
Connector Signal Descriptions
165
Reference for the Parallel Port Connector
The parallel port connector is a DB-25 type connector located on the main logic
board back panel.
board back panel.
Parallel Port Connector Diagram
Parallel Port Signals
Pin
Mnemonic
Signal Name
Description
1
Data_Strobe_L
Data Strobe Low
Set low during forward
channel transfers to latch data
into peripheral device. Set
high during reverse channel
transfers.
channel transfers to latch data
into peripheral device. Set
high during reverse channel
transfers.
2 to 9
Data[0..7]
Data0 Through
Data7
Data7
The main data bus for the
parallel port. Data0 is the least
significant bit (LSB). These bits
are not used during reverse
channel transfers.
parallel port. Data0 is the least
significant bit (LSB). These bits
are not used during reverse
channel transfers.
10
ACK_L
Acknowledge Low
Driven low by the peripheral
device to acknowledge data
byte transfer from host during
forward channel transfer.
Qualifies data being
transferred to host in reverse
channel transfer.
device to acknowledge data
byte transfer from host during
forward channel transfer.
Qualifies data being
transferred to host in reverse
channel transfer.
1
13
25
14