5-10
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Connector Pin Assignments
5
Keyboard/Mouse
Device, TTL
Levels
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
Miscellaneous
Signals
TMPRSNT
Indicates transition module is installed
AUXVCC
Auxiliary VCC power
PMC1 I/O
PMC1IO [1 to 64]
PMC channel 1 I/O signals 1 through 64
EIDE (ATA-2),
Secondary
Channel, TTL
levels
SDREQ-
Drive DMA request
SDACK-
Drive DMA acknowledge
SIOR-
Drive I/O read
SIOW-
Drive I/O write
SIORDY-
Indicates drive is ready for I/O cycle(s)
SD[15:0]
Drive data lines, bits 15 -- 0
SRSTDRV
Reset signal to drive
SCS1
Chip select drive 0, also command register block
select
SCS3
Chip select drive 1, also command register block
select
SA[2:0]
Drive register and data port address lines
SINTRQ
Drive interrupt request
Table 5-8. Signal Descriptions for the Backplane Connector (J5)
Signal
Signal
Mnemonic
Signal Description