Description
The UM82C482, Integrated System Controller (SC), is part of UMC's high performance 80386/80486 PC/AT chip set.
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.
UM82C482-UMC.pdf
