Two clock microprocessor design with stall
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United States of America Patent
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Aug 15, 1995
Grant Date -
N/A
app pub date -
Feb 8, 1994
filing date -
Feb 8, 1994
priority date (Note) -
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Abstract
A circuit and method suspend the operation of a CPU of a microprocessor while a memory control unit (MCU) of the microprocessor performs certain operations for the CPU. The circuit is used to generate two internal clock signals from an external clock signal generated off-chip. The first internal clock signal is used to control the MCU and runs continuously. The second internal clock signal is used to control the CPU. During MCU operations requiring wait states, a stall circuit stalls the second internal clock to suspend the operation of the CPU and to thereby prevent CPU register values from changing. The circuit and method eliminate the need for certain data circulation logic within the CPU.
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