PPT Slide

Register Definition (all registers 16-bits)

IR instruction register, dest for instr being fetched

IR_exe instruction currently being executed

MDR memory data register, data buffer to/from IB

IBADDR address register, drives IB

IC instruction counter of next instruction

IC_old instruction counter for currently exe inst

MAR memory address register, operand address

A,B buffer registers for data read from RF core

C buffer register for data written to RF core

FLT fault register

SW status word register

PI pending interrupt register

FMK fault mask register

IMK interrupt mask register

XH,XL temporary registers used in Mult, Div, IO ops

YH,YL temporary registers used in Mult, Div, IO ops

Some smaller misc registers not shown on diagram. Used for RF address

computation, constant block addressing, etc.

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