12/07/95 ARM7500 July 1995.
Designed by ARM Ltd, this single chip computer combines a CPU, video generator, memory controller and I/O system in one 240 pin monolithic device. The ARM7500 is almost a Risc PC on a chip. The 7500 includes an ARM7 processor with associated MMU, 8 word write buffer and 4Kbyte cache. There is also a complete video generator chip, similar to VIDC20, and most of the functions of IOMD. The chip boasts two PS/2 keyboard ports, which can be used for an industry standard PC keyboard and a PS/2 mouse. And there is a four-channel PC joystick interface.
Summary of features
ARM704 CPU with 4Kbyte cache, MMU and 8 word write buffer
Video generator capable of up to 24-bit colour
LCD support for mono LCD (built-in greyscaler) and TFT type colour panels
Stereo sound output, either analogue (8-bit logarithmic) or digital IIS
DRAM controller, supports four 64Mbyte banks with variable access speed
Programmable DRAM refresh options
DMA controller for video, cursor and sound data reads
Built-in 16-bit I/O bus - expandable to 32-bits
Four comparator controlled timers to support PC-style joysticks
Two PS/2-style 'keyboard' ports
8-bit general purpose I/O port
Two timers - IOC compatible
Power-saving modes - Suspend CPU or Stop clocks
Optional 16-bit wide data path, for DRAM and ROM
Support for executing code from 16-bit I/O mapped memory (PMCIA XIP).
The table below shows its performance benchmarks against other Acorn computers and PC competition.
The block diagram shows the layout of the ARM7500.
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