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P1754-30PGMB Datasheet(PDF) 1 Page - Pyramid Semiconductor Corporation |
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P1754-30PGMB Datasheet(HTML) 1 Page - Pyramid Semiconductor Corporation |
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1 / 20 page  Document # MICRO-5 REV C Revised November 2005 PACE1754 SINGLE CHIP, 40MHz CMOS PROCESSOR INTERFACE CIRCUIT (PIC) 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 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. In addition to providing significant savings in part count and power dissipation the PIC uses only a 5V ±10%, single supply and operates at 20, 30 and 40 MHz over the fully Military Temperature Range. The PIC provides many important system functions. These functions are governed by respective bit positions in a programmable Control Register which is incorporated in the PIC. The individual bits of the control register are set to select the various features and are set to a specified default value upon Reset. |
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