Syed M Rahman

US Patent:

7827360, Nov 2, 2010

Filed:

Aug 2, 2007

Appl. No.:

11/832797

Inventors:

Syed R. Rahman - Austin TX, US
David F. Greenberg - Austin TX, US
Kathryn C. Stacer - Round Rock TX, US
Klas M. Bruce - Leander TX, US
Matt B. Smittle - Allen TX, US
Michael D. Snyder - Austin TX, US
Gary L. Whisenhunt - Austin TX, US

Assignee:

Freescale Semiconductor, Inc. - Austin TX

International Classification:

G06F 12/00

US Classification:

711141, 711143, 711144, 711163

Abstract:

A method and device for locking a cache line of a cache is disclosed. The method includes automatically changing a state of a cache line from a valid locked state to an invalid locked state in response to receiving an indication that a memory location external to the cache and corresponding to the cache line is associated with an access request by a processor or other data access module. Thus, the locked state of a cache line is maintained even after data in the locked cache line is invalidated. By maintaining the invalid locked state, the cache line is not available for reallocation by the cache. This allows locked cache lines that become invalidated to remain locked without additional software overhead to periodically determine whether the lock has been lost due to invalidation of the cache line.

US Patent:

60231513, Feb 8, 2000

Filed:

Mar 16, 1998

Appl. No.:

9/039528

Inventors:

Richard Hudson - Bell FL
Syed Rahman - Gainesville FL
Thorfinn Thayer - Gainesville FL
Jai Prakash - Gainesville FL
Nate Banes - Gainesville FL

Assignee:

Eveready Battery Company, Inc. - St. Louis MO

International Classification:

H01H 3500
H02J 700

US Classification:

320135

Abstract:

The subject invention pertains to a method and device for implementing a dynamic End of Discharge Voltage (EODV) for rechargeable batteries and battery packs (batteries/packs). This dynamic EODV can be adjusted based on, for example, environment, operating conditions, temperature, residual capacity, cell chemistry, cell size, form factor, discharge rate, and/or the number of charge/discharge cycles the battery has undergone. The subject invention can provide for enhanced run time from each discharge cycle of the battery/pack. In addition, the subject invention can provide for more accurate save-to-disk alarms, while ensuring adequate energy for the actual save to disk operation. Furthermore, the subject invention can also extend the useful life of the battery/pack.

US Patent:

61733504, Jan 9, 2001

Filed:

Oct 16, 1998

Appl. No.:

9/174509

Inventors:

Richard A. Hudson - Bell FL
Thorfinn Thayer - Gainesville FL
Syed Rahman - Hillsboro OR
Morland Taylor - Gainesville FL

Assignee:

Eveready Battery Company Inc. - St. Louis MO

International Classification:

G06F 1300

US Classification:

710126

Abstract:

The present invention provides control bus (SMBus) management and interface for a smart battery system having an SMBus two-wire interface with a clock and data line. Electrostatic discharge protection circuitry which does not have the potential to inadvertently charge a dead battery is provided for the SMBus. SMBus mastering circuitry is also provided to work in conjunction with the SMBus interfacing routines for communications on the bus.

US Patent:

59906642, Nov 23, 1999

Filed:

Mar 30, 1998

Appl. No.:

9/050310

Inventors:

Syed Rahman - Gainesville FL

Assignee:

Eveready Battery Company, Inc. - St. Louis MO

International Classification:

H02J 700

US Classification:

320136

Abstract:

The present invention provides a method and apparatus for converting the terminal voltage of a battery so that one or more operations (such as shut-down, save-to-disk, and the like) begin at the appropriate point on the discharge curve for various cell chemistries. A control circuit is provided for triggering end-of-discharge operations based on various predetermined points, such as remaining capacity, voltage, temperature, and safety for devices which utilize a predetermined terminal voltage measurement to trigger one or more operations. The control circuit modulates the terminal voltage of the battery to a value which substantially matches the predetermined terminal voltage threshold of the device upon reaching a predetermined point, thereby successfully triggering operations at the appropriate time. The control circuitry also can modulate the terminal voltage to maintain it above the threshold to delay triggering of one or more operations. The method and apparatus of the present invention provides a solution in the electronic circuitry of the battery to allow devices designed for use with cells of a certain chemistry be able to suspend operations without losing data or delay operations to avoid wasting battery capacity when used with cell chemistries different than those for which the devices were designed.