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P1754-20GMB データシート - Semiconductor Corporation
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PACE1754 PROCESSOR INTERFACE CIRCUIT DESCRIPTION
The PACE1754 Processor Interface Circuit (PIC) is a single chip implementation of many special system functions that are often required when using the PACE1750A/AE, single chip, 40MHz CMOS Microprocessor. The PIC allows a system designer to design a higher performance, more effecient microprocessor system which uses less power and takes up less board space than was previously possible.
FEATURES
◾ The PACE1754 (PIC) is a support chip for the
PACE1750A/AE Processor. It eliminates the SSI/
MSI Logic and external system functions
required in typical 1750A implementations.
◾ 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
tests the PACE1750A/AE CPU, PACE1753
MMU/COMBO, PACE1754 PIC and system
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
◾ 20, 30 and 40 MHz operation over full Military
Temperature Range
◾ Single 5V ± 10% Power Supply
◾ Power Dissipation over Military Temperature
Range
< 0.25 watts at 20 MHz
< 0.30 watts at 30 MHz
< 0.35 watts at 40 MHz
◾ Available in:
— 64-Pin DIP or Gull Wing (50 Mil Pin centers)
— 68-Pin Pin Grid Array (PGA) (100 Mil centers)
— 68-Lead Quad Pack
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