PPC7A Product Manual
Connectors
5-7
1
st
Edition
VMEbus Signal Descriptions Continued
M
NEMONIC
S
IGNAL
D
ESCRIPTION
WRITE~
Write. This is generated by a master to show whether the data transfer cycle is a read or a write
+5VSTDBY
+5 Volts DC Standby. This su5V DC to devices requiring battery back-up
+5V
+5 Volts DC power
+12V
+12 Volts DC power
-12V
-12 Volts DC power
GA0~ to GA4~
Geographic Address. These are used to set the slave VME address of the board. GA0~ to GA3~ may be set to
zero by fitting links E4, E8, E10 and E5 respectively. When GA4~ is not connected, a pull-up resistor on the
PPC7A pulls the signal high
P2 I/O Signal Descriptions
M
NEMONIC
S
IGNAL
D
ESCRIPTION
DB0~ to DB7~
SCSI bus data
DBP~
SCSI bus data parity
ATN~
SCSI bus Attention
BSY~
SCSI bus Busy
ACK~
SCSI bus Acknowledge
RST~
SCSI bus Reset
MSG~
SCSI bus Message phase
SEL~
SCSI bus Select
C/D
SCSI bus Command/Data phase
REQ~
SCSI bus Request
I/O
SCSI bus I/O phase
TERMPWR
SCSI bus terminator power. Supplies power for external SCSI bus terminators. Rated at 1 Amp†
MOUSE_CLK
Mouse Clock. Clock drive for mouse
MOUSE_DATA
Mouse Data. Mouse data line
KBD_5V
Keyboard 5V. Supplies power for the keyboard and mouse or USB supply when USB is fitted. Rated at 1A†
KBD_CLK
Keyboard Clock. Clock drive for the keyboard
KBD_DATA
Keyboard Data. Keyboard data line
COM1/2/3/4/5/6_TXD
COM1/2/3/4/5/6 Transmit Data
COM1/2/3/4/5/6_RXD
COM1/2/3/4/5/6 Receive Data
COM1/2/3/4/5/6_RTS
COM1/2/3/4/5/6 Request-To-Send
COM1/2/3/4/5/6_CTS
COM1/2/3/4/5/6 Clear-To-Send
COM3/4_TT
COM3/4 Terminal timing
COM3/4_RT
COM3/4 Receive timing
COM3/4_ST
COM3/4 Send timing
KEYLOCK_IN
Keylock input. Used to detect the state of an external keyswitch. May be used to implement system password
protection
SPEAKER_OUT
Loudspeaker Output. Outputs Timer2 Audio. May be used to drive 4
Ω
or 8
Ω
loudspeaker
NSELECTIN
Parallel port Select In
nINIT
Parallel port INIT
nFAULT
Parallel port FAULT
nAUTOFD
Parallel port AUTOFD
SELECT
Parallel port SELECT
PERROR
Parallel port PERROR
Continued over leaf.
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