Service manual

Service Manual
Glossary of terms for PAL signal names
SCSI Small computer systems interface
SBIC SCSI bus interface controller
DMAC Direct memory access controller
SRAM Static random access memory
PCLK8M 8MHz clock
CLRINT Clear interrupt
INTE Interrupt enable
TC Terminal count
INTRQ Interrupt request
ARMA ARM processor access
MS Module select
URST User reset
RST Reset
ABE ARM bus enable
IRST Internal reset
IRQ Interrupt request
DINT DMA interrupt
FIQ Fast interrupt
SINT SCSI interrupt
SRST SCSI reset
PIRQ Podule interrupt
PRE Podule read enable
PWE Podule write enable
LA12 Latched address 12
LA13 Latched address 13
PS Podule select
DACK DMA acknowledge
A0 Address line 0
A23 Address line 23
EPRM EPROM
SRLO Static RAM low
SRHI Static RAM high
PAGE Page register
INTRD Interrupt read
AEN Address enable
IORQ Input/output request
HLDRQ Hold request
STAGE Move to next stage
PNRW Podule not read, write
BL Buffer latch
LBL Latched buffer latch
LIOGT Latched IOGT
REL Release
EXTRW Extended read write
HLDAK Hold acknowledge
IOGT Input output grant
RA7 SRAM address 7
REF8M Reference 8MHz clock
MEMW Memory write
C2 Counter bit 2
C1 Counter bit 1
C0 Counter bit 0
IOWR I/O device write
IORD I/O device read
I/O Input/Output
MEMR Memory read
CNTR0 Counter bit 0
CNTR1 Counter bit 1
CNTR2 Counter bit 2
RWD Read write done
B*** Buffered 'signal'
UDE Upper data enable
NC Not connected
Bibliography
• WD33C93A SCSI Bus Interface Controller Data Book
(document no. 79-000199). Available from Western
Digital (UK) Ltd, The Old Manor House, 17 West
Street, Epsom, Surrey KT18 7RL.
• NEC Microprocessor and Peripheral Data Book,
covering the uPD71071 DMA controller. Available
from NEC Electronics (UK) Ltd, Cygnus House,
Linford Wood Business Centre, Sunrise Parkway,
Linford Wood, Milton Keynes MK14 6NP.
• 'A Series Podules' - a specification of the Acorn
podule bus, available as an Application Note from
Customer Services (address as at the front of this
manual).
• Acorn SCSI Expansion Card User Guide, supplied
with the SCSI expansion card.
• Acorn SCSI Expansion Card Service Manual.
Part 2 - Interface cards Issue 2, June 1991 2-23