Kenneth E House, Age 95South Dennis, MA

7228474, Jun 5, 2007

Jan 7, 2003

10/337665

Emrys Williams - Milton Keynes, GB
Kenneth Alan House - Arlington MA, US
Joseph Raymond Siegel - Shrewsbury MA, US

Sun Microsystems, Inc. - Santa Clara CA

G01R 31/28
H04L 1/00

714726, 713176

A semiconductor device includes at least one component which is vulnerable to damage during scan testing for a particular input data configuration, and supports a safe mode in which this particular input data configuration is disabled. The semiconductor device also includes a port for receiving an input scan vector for scan testing, and an authorization unit connected to said port. The authorization unit maintains the device in safe mode if an input scan vector does not satisfy at least one predetermined criterion. In one particular implementation, the authorization unit generates a digital signature for the input scan vector, which is then compared to a signature portion included within the input scan vector itself. Scan testing is enabled providing that this comparison finds a match.

2004013, Jul 8, 2004

Jan 7, 2003

10/337573

Emrys Williams - Milton Ketnes, GB
Kenneth House - Arlington MA, US
Joseph Siegel - Shrewsbury MA, US

G01R031/28

714/726000

A semiconductor device can be subjected to scan testing by using an input scan test vector. This input scan test vector is processed by the device to produce an output scan test vector, which can be used for diagnostic purposes with respect to the device. There are certain locations in this output scan test vector that may be indeterminate in value, even for a correctly functioning device. In other words, it is not possible to predict beforehand what values the output scan test vector will have at these locations. Therefore, an output mask vector is provided that identifies those locations in the output scan test vector that are indeterminate. This mask vector is then combined with the output scan test vector using a logical operation to produce a determinate masked output scan test vector. For example, if all the indeterminate locations are flagged by a 1 in the mask vector, then using OR for the logical operation will ensure that the output for these locations is always a 1. Having a fully determinate output vector allows a signature to be calculated for this vector, and this signature will have a predetermined value for a correctly functioning device.

5274783, Dec 28, 1993

Jun 28, 1991

7/723149

Kenneth A. House - Arlington MA
John Kirk - Boxboro MA
Lawrence Narhi - Bolton MA

Digital Equipment Corporation - Maynard MA

G06F 1300

395325

A bus interface employs a bus extender for connecting an auxiliary bus to a single port on a main bus in such a way as to interconnect one or more host computers on the main bus to one or more peripheral devices on the auxiliary bus. The bus extender employs a transceiver coupled to the main bus, another coupled to the auxiliary bus, and signal transfer and logic circuitry passing signals between and controlling the operation of the transceivers. The circuitry also performs all address translation necessary for inter-bus communication. Once communication links have been established with the designated devices on the other bus, the extender sends message data signals received over the one bus directly onto the other bus without modification. Since the interface can comply with SCSI standards, any of a variety of types of commercially available peripheral devices having controllers complying with those standards can be supported on the auxiliary bus.