Method and apparatus for determining linking addresses for micro

Details Method and apparatus for determining linking addresses for micro Method and apparatus for determining linking addresses for micro

1978-04-17

1981-03-03

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 926

Patent

active

042544610

ABSTRACT:
Linking addresses of microinstructions contained in a control memory of a microprogrammed data processing system are determined. The system includes storage elements for predetermined signals and an address register. Each microinstruction includes a preparation phase followed by an execution phase. The microinstructions occur in cycles so microinstruction cycle (n+ 1) follows microinstruction cycle n. The microinstruction of cycle n has: (a) a first bit field designating a linking address to the microinstruction of cycle (n+1) unless modified during cycle n, (b) a second bit field selectively designating which storage elements contain signals that can control selected bits of the first field, and (c) a third bit field for selectively enabling changes to be made in the storage elements. During cycle n, signals in certain storage elements, selected by the third field are selectively changed, the first field is selectively modified in response to signals in storage elements selected by the second field, the modified first field is stored in the address register, and then the address in the address register is supplied to the control memory. As a result of these operations, during the execution phase of cycle (n+1), the microinstruction at the address supplied to the control memory during cycle n is executed.

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patent: 4080651 (1978-03-01), Cronshaw et al.
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