Documented parts

• 82C206

The 82C206 Integrated Peripheral Controller (IPC) is a single-chip integration of all the main peripheral parts attached to the X bus of PC/AT architecture. 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
• one 74LS612 memory mapper

Provides:

• Seven DMA channels
• 13 interrupt request channels
• two timer/counter channels

Four DMA transfer modes supported:

• Single
• Block
• Demand
• 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

Other features:

• 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 for the 8237, 8259A and 8254
• 84-pin PLCC (plastic leadless chip carrier) or 100-pin QFP (quad flat pack)