Scannable storage cell and method of operation

Details Scannable storage cell and method of operation Scannable storage cell and method of operation

1995-12-04

1998-02-17

Nguyen, Hoa T.

Excavating

371 2231, 327202, G01R 3128

Patent

active

057198780

ABSTRACT:
Circuitry (20) and an associated an method of operation provides system data (30) and scan data (32) to a latch portion (42) of a data storage element in a reduced setup time period. For each data storage element, a system data transfer gate (22) provides system data (30) to a master latch portion (42) while a scan data transfer gate (24) provides scan data (32) to the master latch portion (42). The scan data (24) and system data transfer (22) gates minimize the set-up time required for data entering the data storage element. Scan chains incorporating the data storage elements include scan data input ports and scan data output ports as well as connections between data storage elements in an associated scan chain. A controller (26) operated by a scan enable signal (38) and a system clock (40) provide control signals to the system data transfer gate (22) and the scan data transfer gate (24) to cause the gates to selectively pass data. The controller 26 serves as a multiplexor function for scan data and system data, and serves a clocking loading minimizing function to speed the data path.

REFERENCES:
patent: 5130568 (1992-07-01), Miller et al.
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patent: 5317205 (1994-05-01), Sato
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patent: 5378934 (1995-01-01), Takahashi et al.
patent: 5444404 (1995-08-01), Ebzery
patent: 5463338 (1995-10-01), Yurash
patent: 5471152 (1995-11-01), Gheewala et al.

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