05732246 is referenced by 174 patents and cites 28 patents.

A given interconnect of a programmable gate array includes a programmable repeater circuit that enables selective isolation and testing of a select block of configured circuitry within the programmable gate array. The programmable repeater circuit includes an input node coupled to a first portion of the given interconnect and an output node coupled to a second portion of the given interconnect. A selective buffer circuit selectively outputs a buffered output signal to the output node that is related to a logic state at the input node. A signal storage circuit is also connected to the input node for selectively storing the logic state received from the input node. In a further embodiment, the signal storage circuit comprises an LSSD register. A primary latch of the LSSD register receives data selectively either from the input node, in accordance with a first clock signal, or alternatively from a secondary serial input node, in accordance with a second clock signal. A secondary latch of the LSSD register is selectively coupled, per a third clock signal, to receive and latch therein latched data of the primary latch. Data representative of data latched within the secondary latch is provided at a secondary serial output, and selectively provided at the primary output node when enabled per a programmable enable signal. In yet a further embodiment, the LSSD register is part of a serial scan chain for selectively interfacing an interconnect boundary of the select block of the configured circuitry within the programmable gate array.

Title
Programmable array interconnect latch
Application Number
8/480639
Publication Number
5732246
Application Date
June 7, 1995
Publication Date
March 24, 1998
Inventor
Brian Allen Worth
Milton
VT, US
Wendell Ray Larsen
Essex Junction
VT, US
Frank Ray Keyser III
Colchester
VT, US
Scott Whitney Gould
South Burlington
VT, US
Agent
Heslin & Rothenberg P C
Assignee
International Business Machines Corporation
NY, US
IPC
G06F 17/50
G06F 9/455
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