Pump bus to avoid indeterminacy in reading variable bit field

Details Pump bus to avoid indeterminacy in reading variable bit field Pump bus to avoid indeterminacy in reading variable bit field

G - Physics

06

F

354/232

G06F 13/36 (2006.01) G06F 13/20 (2006.01) G06F 13/40 (2006.01) G06F 13/42 (2006.01)

Patent

CA 2008071

PUMP BUS TO AVOID INDETERMINACY IN READING VARIABLE BIT FIELD ABSTRACT A data field having a variable number of zero-level bits is read by a bus in a digital system, wherein the bus is pumped by writing all logical "one" bits onto the bus lines just before they are read. The unused bits will then be still in a logical "one" state, i.e. a known value, rather than floating or at an indeterminate value. A program for performing this operation in a computer uses steps to prevent other operations such as refresh cycles or interrupts from being interposed between the write and read cycles. A CPU may use this method to read a system identifier value upon boot-up, for example.

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