Motorola CPV5300 CompactPCI Installation Manual page 73

Pin Assignments
Table A-22. Signal Descriptions for CPV5300 SBC (J5)/CPV5300 TM
(P5) Backplane Connector Pin Assignments (Continued)
Signal
Floppy Disk Drive,
TTL levels
EIDE (ATA-2),
TTL levels
Signal
Mnemonic
RI ring indicator
RTS request to send
RXD serial receive data
TXD serial transmit data
DSKCHG indicates the drive door has been opened
DIR controls direction of the head during step operations
DRVDENS disk density select communication
[1:0]
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
IOCS16 indicates a 16 bit register is decoded
DMARQ drive DMA request
DMACK drive DMA acknowledge
DIOR drive I/O read
DIOW drive I/O write
DASP drive active/slave present
IORDY indicates drive is ready for I/O cycle(s)
DD[15:0] drive data lines, bits 15 - 0
DRESET reset signal to drive
CS1 chip select drive 0, also command register block
select
Signal Description
A
A-29