Method and apparatus for data transfer to and from devices throu

Details Method and apparatus for data transfer to and from devices throu Method and apparatus for data transfer to and from devices throu

1990-10-09

1992-10-13

Beausoliel, Robert W.

Excavating

324 731, 324158R, G01R 3128

Patent

active

051557320

ABSTRACT:
A scheme is provided for efficient transfer of N separate L-bit segments of data (where N and L are integers) to or from an L-bit register (14) in a device under test (10) serially coupled with at least one other register in a device (10') in a scan chain. To carry out such data transfer, a stream of N L-bit segments of interest is first concatenated to, and ahead of, a packet of L.sub.1 filler bits, where L.sub.1 is the cumulative number of register cells in the chain of devices (10') upstream of the L-bit register (14) in the device under test (10). The stream of L.sub.1 +NL bits is applied to the chain by shifting the first L.sub.1 bits of the block of NL bits through the chain to flush the previous data stored in the registers upstream of the L-bit register in the device under test (10). The remaining bits in the stream of L.sub.1 +NL bits are then shifted through the chain of devices (10 and 10' ) until the L.sub.1 filler bits have been shifted into the data registers of the devices (10') upstream of the device under test. An alternate data transfer scheme is also provided.

REFERENCES:
patent: 4534028 (1985-08-01), Trischler
patent: 4827476 (1989-05-01), Garcia
patent: 4872169 (1989-10-01), Whetsel
patent: 4947357 (1990-08-01), Stewart et al.
patent: 5079725 (1992-01-01), Geer et al.

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