Structure and method for multiplexing pins for in-system programming
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United States of America Patent
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Aug 17, 1993
Grant Date -
N/A
app pub date -
May 3, 1991
filing date -
May 3, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A structure and method for in-system programming of a programmable logic device are provided. The in-system programming structure provides one dedicated pin for in-system programming function, additional in-system programming pins are multiplexed with programmable input/output pins used in functional operations. When an enable signal is received at the dedicated pin, the multiplexed pins relinquish their roles as programmable input/output pin to become in-system programming pins. A state machine controls the programming steps. The in-system programming structure can be cascaded in a 'daisy chain' fashion.
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