Table 5-6. Signal Descriptions For The Backplane Connector (J4) - Motorola CompactPCI CPN5365 Installation And Use Manual

Table 5-6. Signal Descriptions for the Backplane Connector (J4)

Signal Signal
Mnemonic
Floppy Disk Drive DSKCHG-
DIR-
DS[1:0]-
HDSEL-
INDEX-
MTR[1:0]
RDATA-
STEP-
TR0-
WDATA-
WGATE-
WPROT-
DRVDENS[1:0]
PDIAG-
DASP-
ACK-
BUSY
ERR-
PD[7:0]
PE
AFD-
INIT-
SLIN-
STB-
SLCT
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CompactPCI Bus Connectors (J1 and J2)
Signal Description
Indicates drive door is open
Controls direction of the head during step operation
Drive selects
Selects top or bottom side head
Indicates the beginning of a track
Motor enables
Data read
Step, pulses move head in or out
Indicates that head is positioned above track 00
Write data to drive
Enables head write circuitry of drive
Indicates a disk is write-protected
Disk density select communication
Output from drive 1 and monitored by drive 0
Drive active/slave present
Pulsed by peripheral to acknowledge data sent
Indicates that printer cannot accept more data
Peripheral detected an error
Parallel data lines, bits 7--0
Paper end, indicates the printer is out of paper
Auto feed, causes printer to line feed
Initializes the printer
Select in, selects the printer
Data strobe, indicates data is valid
Select, peripheral indicates it is selected
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