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Table A-18. Signal Descriptions for the CPV5350 Single Board
Computer (J5) Backplane Connector (Continued)
Signal
Serial COM
Ports 1 and 2,
RS-232 levels
Floppy Disk
Drive, TTL
levels
Keyboard/
Mouse
Device, TTL
levels
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Signal
Mnemonic
CTS
clear to send
DCD
data carrier detected
DSR
data set ready
DTR
data terminal ready
RI
ring indicator
RTS
request to send
RXD
serial receive data
TXD
serial transmit data
DSKCHG-
indicates drive door is open
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 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
MCLK
clock for PS/2 mouse
MDAT
serial data line for PS/2 mouse
KBDCLK
clock for PC/AT or PS/2 keyboard
KBDDAT
serial data line for PC/AT or PS/2 keyboard
Pin Assignments
Signal Description
A
A-23
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