Boots – shoes – and leggings
Patent
1989-04-07
1992-08-25
Lee, Thomas C.
Boots, shoes, and leggings
395425, 364DIG1, 3642318, 3642443, 3642551, 3642629, G06F 932
Patent
active
051426358
ABSTRACT:
A method for performing consecutive instructions to push data onto a stack in memory in a digital computer is described. During a first clock cycle, an instruction is decoded requiring a stack push operation. A control indicator is also generated calling for a stack push operation. During a phase one of a second clock cycle, (a) a stack pointer value stored in a selected stack pointer register is written onto a first bus, the selected stack pointer register being one of either the first stack pointer register or the second stack point register, and (b) the stack pointer value stored in the selected stack pointer register is written into an input latch of a stack pointer adder. During a phase two of the second clock cycle, (a) a stack memory address is formed by using the stack pointer value on the first bus, (b) the stack pointer value stored in the input latch of the stack pointer adder is decremented by a delta amount to form an updated stack pointer value, and (c) the updated stack pointer value is stored in an output latch. During a phase one of a third clock cycle, (a) the updated stack pointer value stored in the output latch is written onto a second bus, and (b) the updated stack pointer value on the second bus is written into a second stack pointer register for storage. During a phase two of a third clock cycle, (a) data is written to memory for storage at a memory location indicated by the stack memory address, and (b) the updated stack pointer value from the second stack pointer register is written into the first stack pointer register for storage. A method for performing consecutive instructions to pop data off a stack in memory in a digital computer is also described. In a digital computer with memory, circuitry for performing a stack operation is also described.
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patent: 3889243 (1975-06-01), Drimak
patent: 4524416 (1985-06-01), Stanley
patent: 4890221 (1990-12-01), Gage
patent: 4984151 (1991-01-01), Dujavi
patent: 5006980 (1991-04-01), Sanders
Coleman Eric
Intel Corporation
Lee Thomas C.
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