Sun Microsystems SUN BLADE 150, Руководство по обслуживанию

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B-12 Sun Blade 150 Service Manual • June 2002
B.6 Parallel Port Connector
The parallel port connector is a DB-25 type connector located on the back panel.
FIGURE B-10
Parallel Port Connector J9 Pin Configuration
TABLE B-9
Parallel Port Connector J9 Pin Assignments
Pin Signal Description
1 Data_Strobe_L Set low during forward channel transfers to latch data into
peripheral device. Set high during reverse channel transfers.
2 to 9 Data[0.7] The main data bus for the parallel port. Data0 is the
least-significant bit (LSB). Not used during reverse channel
transfers.
10 ACK_L 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.
11 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.
12 PERROR 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.
13 SELECT_L Indicates the peripheral device is on-line during forward
channel transfer. Used to send Data1 and Data5 during
reverse channel transfer.
14 AFXN_L 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.
15 ERROR_L Set low by the peripheral device to indicate an error during
forward channel transfer. In reverse channel transfer, set low
to indicate peripheral device has data ready to send to the
host. Used to send Data0 and Data4.
13
1
14 25