CompactPCI Bus Connectors (J1 and J2)
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Table 5-6. Signal Descriptions for the Backplane Connector (J4)
Signal
Signal
Mnemonic
Signal Description
Floppy Disk Drive
DSKCHG-
Indicates drive door is open
DIR-
Controls direction of the head during step operation
DS[1:0]-
Drive selects
HDSEL-
Selects top or bottom side head
INDEX-
Indicates the beginning of a track
MTR[1:0]
Motor enables
RDATA-
Data read
STEP-
Step, pulses move head in or out
TR0-
Indicates that head is positioned above track 00
WDATA-
Write data to drive
WGATE-
Enables head write circuitry of drive
WPROT-
Indicates a disk is write-protected
DRVDENS[1:0]
Disk density select communication
PDIAG-
Output from drive 1 and monitored by drive 0
DASP-
Drive active/slave present
ACK-
Pulsed by peripheral to acknowledge data sent
BUSY
Indicates that printer cannot accept more data
ERR-
Peripheral detected an error
PD[7:0]
Parallel data lines, bits 7--0
PE
Paper end, indicates the printer is out of paper
AFD-
Auto feed, causes printer to line feed
INIT-
Initializes the printer
SLIN-
Select in, selects the printer
STB-
Data strobe, indicates data is valid
SLCT
Select, peripheral indicates it is selected