OPTi 82C206
The 82C206 replaces the following peripheral logic on motherboards: two 8237 DMA controllers, two 8259A interrupt controllers, one 8254 timer/counter, one 146818A-compatible real-time clock, and one 74LS612 memory mapper. The 82C206 also offers several enhanced features and improved speed performance. These include an additional 64 bytes of user definable CMOS RAM in the real-time clock and drastically reduces the recovery time for the 8237, 8259A, and 8254.| Part No. | 82C206 |
|---|---|
| Datasheet | 82C206 Download |
| Manufacturer | OPTi |
| Description | Integrated Peripheral Controller |
| Buy | Stock & Price |
FEATURES
● Fully compatible with PC/AT-based systems● Includes: - two 8237 DMA controllers - two 8259A interrupt controllers - one 8254 timer/counter - one 146818A-compatible real-time clock - an additional 64 bytes of CMOS RAM - one 74LS612 memory mapper
● Provides: - Seven DMA channels - 13 interrupt request channels - two timer/counter channels
● Four DMA transfer modes supported: - Single - Block - Demand Figure 1-1 DREQ1 HLDA DATA ADDRESS IOR#/IO W# 82C206 Block Diagram DMACLK 8237 DMA8 8237 DMA16 - Cascade
● Special Commands provided for ease of programming: - Clear byte pointer flip-flop - Set byte pointer flip-flop - Master clear - Clear request mask register - Clear mode register counter
● Contains 114 bytes of CMOS RAM
● 8MHz DMA clock with programmable internal divider for 4MHz operation
● 16MB DMA address space
● Programmable wait states for DMA cycles
● Reduced recovery time (120ns) between I/O operations
● 84-pin PLCC (plastic leadless chip carrier) or 100-pin QFP (quad...
