Datasheet Details
| Part number | UM82C482 |
|---|---|
| Manufacturer | UMC |
| File Size | 103.56 KB |
| Description | SYSTEM CONTROLLER |
| Datasheet |
 UM82C482 Datasheet
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General Description
The UM82C482, Integrated System Controller (SC), is part of UMC's high performance 80386/80486 PC/AT chip set.
It contains AT bus control logic, data bus conversion logic, CPU reset logic, clock generation for CPU, keyboard and timer, DMA/refresh logic and peripheral interface logic.
Key Features
- Interface logic for 80386 and 80486 CPUs Feedback CPU clock to reduce clock skew and to increase system stability Use 1X clock in 80486 mode to ease system design Synchronous AT bus clock with programmable CPU clock (divided by 2, 3, 4, 5, 6) Programmable CPU clock (divided by 1, 2, 3, 4) Programmable keyboard clock (divided by 1.5, 2) Separate DMA and refresh request to perform hidden refresh DMA interface logic, refresh address counter and control logic Fast CPU reset and GATE A20 to.