VLSI VL82C481 (System/Cache/ISA bus Controller)
Chipset parts
Release date
1992-01-01
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Description:
Overview
The VL82C481 controller is designed to control 486DX or 486SX/487SX-based ISA bus systems operating at up to 40 MHz. It also supports 486 family CPUs that contain an integrated write-back cache (P24T, etc.)
The VL82C481 replaces the following devices on the motherboard:
- Two 82C37A DMA controllers
- Two 82C59A interrupt controllers
- 82C54 timer
- 74LS612 memory mapper
- 82284 clock generator and ready interface
- 82288 bus controller
The following controller blocks are also included on-chip:
- Memory/refresh controller
- Port B and NMI logic
- Bus steering logic
- Turbo Mode control logic
- Parity checking logic
- Parity generation logic
- Writ-back look-aside cache controller
In addition to the VL82C114 Combination I/O the additional configurations have been found:
- VL82C481 + VL82C113A
- VL82C481 + 721 I/O support
- VL82C481 + SMC 665 I/O support
Differences to the VL82C480:
- Includes full support for CPU's with internal write-back cache (P24T, etc.)
- Comprehensive VESA VL-Bus support
- Optional keyboard command blocking for fast A20GATE and CPU reset
- Perform 3-2-2-2 cycle reads for support of slower SRAMs at higher frequences.
Last updated 2019-04-30T00:00:00Z
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