PACE1754/SOS
PROCESSOR INTERFACE CIRCUIT (PIC)
CMOS/SOS SPACE PROCESSOR
MICROPERIPHERAL
FEATURES
Single 5V ± 10% Power Supply
The PACE1754 (PIC) is a support chip for the
PACE1750A/AEProcessors. Iteliminatesthe
SSI/MSI Logic and external system functions
required in typical 1750A implementations.
Available in:
— 68-Lead Quad Pack with optional Gull Wing
Surface Mount
Provides a significant savings in part-count and
power dissipation enhancing reliability and
overall system speed performance.
Provides an optimal interface when used with
the PACE1753 MMU/COMBO in a full 1750A
implementation.
Provides the following additional important
system functions:
— Programmable READY for memory and I/O
— Automatic READY during self-test and
internal I/O instructions
— 100KHz timer clock output provided
— Programmable system watchdog—ranges
from 1 µs to 1 minute
— Programmable Bus time-out function
— Memory Parity generation/detection
— Error detection of unimplemented memory
and/or I/O space addressing
— First failing memory address register for
diagnostics
— High drive three-state address latches
— Built-in system test program—automatically
teststhePACE1750A/AECPUs,PACE1753
MMU/COMBO,PACE1754PICandsystem
address lines as well as memory and I/O
strobes
— System configuration decoding and buffering
— Interrupt acknowledge decoder and strobe
— Start up ROM support per MIL-STD-1750A
— Memory or I/O READ/WRITE three-state
strobes with external three-state control for
DMA applications
PACE1754 PROCESSOR INTERFACE
CIRCUIT DESCRIPTION
ThePACE1754ProcessorInterfaceCircuit(PIC)isasingle
chipimplementationofmanyspecialsystemfunctionsthat
areoftenrequiredwhenusingthePACE1750A/AE,asingle
chipmicroprocessor. ThePICallowsasystemdesignerto
designahigherperformance,moreeffecientmicroprocessor
system which uses less power and takes up less board
space.
Available with Class S manufacturing,
screening, and testing.
SOS insulated substrate technology provides
absolute latch-up immunity and excellent SEU
tolerance.
ThePICprovidesmanyimportantsystemfunctions.These
functions are governed by respective bit positions in a
programmableControlRegisterwhichisincorporatedinthe
PIC. The individual bits of the control register are set to
selectthevariousfeaturesandaresettoaspecifieddefault
valueuponReset.
SOS devices are fully interchangeable with
application-proven SMD CMOS P1754 devices.
20, 25 and 30 MHz operation over full Military
Temperature Range
Do c um e nt # MICRO-9 REV B
Re vise d Aug ust 2005