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| CZ80CPU General Description Implements a fast, fully-functional, single-chip, 8bit microprocessor with the same instruction set as the Z80. The core has a 16-bit address bus capable of directly accessing 64kB of memory space. It has 252 root instructions with the reserved 4 bytes as prefixes, and accesses an additional 308 instructions. The microcode-free design is strictly synchronous, with no internal tri-states and a synchronous reset. Developed for easy reuse in Actel FPGA applications, the CZ80CPU is available optimized for several device families with competitive utilization and performance characteristics. 8-bit Microprocessor Core Features Programming features contain 208 bits of read/write memory that are accessible to the programmer. The internal registers include an accumulator and six 8-bit registers that can be paired as three 16-bit registers. In addition to general registers, a 16-bit stack-pointer, 16-bit program-counter, and two 16-bit index registers are provided. * * Control Unit o 8-bit Instruction decoder Arithmetic-Logic Unit o 8-bit arithmetic and logical operations o 16-bit arithmetic operations o Boolean manipulations Symbol * Register File Unit o Duplicate set of both general purpose and flag registers o Two 16-bit index registers * * Interrupt Controller o Three modes of maskable interrupts o Non maskable interrupt External Memory interface o Can address up to 64 KB of program memory o Can address up to 64 KB of data memory o Can address up to 64 KB of input/output devices * On-core dynamic memory refresh counter Applications Suitable for many embedded controller applications, including industrial control systems, point-of-sale terminals, and automotive controls. CAST, Inc. April 2003 Page 1 Actel CompanionCore Program CAST CZ80CPU Core Datasheet Performance The CZ80CPU is a technology-independent design that can be implemented in a variety of process technologies. Results with representative Actel devices are shown in Table 1. Utilization (Cells or Tiles) Sequential 391 Tiles 479 Combinatorial 8014 Tiles 6298 Total 26% 38% Family ProASIC PLUS Device (-speed grade) APA750-STD AX1000-3 Axcelerator Table 1: Utilization Table for CZ80CPU Core implemented in Actel Devices Deliverables * * * * * Post-synthesis EDIF netlist (source code versions are also available; contact CAST) Extensive testbench Simulation vectors and expected results Place and route scripts Detailed user's documentation Verification Methods The CZ80CPU core's functionality was verified by means of a proprietary hardware modeler. The same stimulus was applied to a hardware model that contained the original Zilog Z84C00 chip, and the results compared with the core's simulation outputs. Contact Information CAST, Inc. 11 Stonewall Court Woodcliff Lake, New Jersey 07677 USA Phone: +1 201-391-8300 Fax: +1 201-391-8694 E-Mail: info@cast-inc.com URL : http://www.cast-inc.com/cores/actel Copyright (c) 2003, CAST, Inc. All Rights Reserved. Contents subject to change without notice. CAST, Inc. Page 2 |
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