Wing Chan

US Patent:

49981986, Mar 5, 1991

Filed:

Apr 7, 1988

Appl. No.:

7/178667

Inventors:

Wing M. Chan - Fremont CA

Assignee:

Tandem Computers Incorporated - Cupertino CA

International Classification:

G06F 1300

US Classification:

364200

Abstract:

In a data processing system, a device controller, configured to control data transfers between a processor unit and a peripheral device on an input/output bus, is provided with apparatus that permits a data transfer cycle to continue until all data has been transferred, or to allow for interruption of the data transfer cycle by another device controller requesting access to the input/output via a request signal. During a data transfer cycle the apparatus resonds to detection of the request signal to interrupt the data transfer cycle after a predetermined number of data words are transferred, permitting access to the input/output bus for other of the device controllers. In absence of the request signal, the apparatus permits the data transfer to continue until all data has been transferred between the peripheral device and the processor unit.

US Patent:

48274780, May 2, 1989

Filed:

Nov 30, 1987

Appl. No.:

7/126812

Inventors:

Wing M. Chan - Fremont CA

Assignee:

Tandem Computers Incorporated - Cupertino CA

International Classification:

G06F 1110

US Classification:

371 38

Abstract:

Fault tolerant apparatus for generating error correcting code and, simultaneous therewith, checking the correctness of the generation, for blocks of data with which the error correcting code is associated and transmitted to a storage medium. The apparatus includes a pair of programmable control devices configured to selectively operate in one of two modes: A first mode in which data being transferred to the storage medium is monitored for generation of an error correcting code to be associated and stored with each data block, and a second mode in which the data being transferred is monitored for detecting errors that may be contained in the data. During data transmission to the storage device, one of the control devices operates in the first mode, while the other control device operates in the second mode to check operation of the first device. When data is retrieved from the storage device, both control devices operate in the second mode to check the correctness of the data being transferred, and the operability of each other.

Address:

233 15 Ave, San Francisco, CA 94118

VIN:

JTDKN3DU5A1013900

Make:

TOYOTA

Model:

PRIUS

Year:

2010