Electrical computers and digital processing systems: support – Synchronization of clock or timing signals – data – or pulses
Reexamination Certificate
2006-03-21
2006-03-21
Browne, Lynne H. (Department: 2116)
Electrical computers and digital processing systems: support
Synchronization of clock or timing signals, data, or pulses
C713S500000, C713S501000, C713S502000, C368S047000, C368S082000
Reexamination Certificate
active
07017066
ABSTRACT:
The present invention provides hardware-based synchronization within a device such as a set top box so that sets of data values can be communicated between a set of DCR registers operating at a first frequency and a set of clock register operating at a second frequency. Specifically, to communicate an initial set of data values from the set of DCR registers to the set of clock registers, a control signal is stretched and then synchronized with a clock signal having the second frequency. To communicate a current set of data values from the set of clock registers to the set of DCR registers, the control signal is synchronized with a clock signal having the first frequency. By communicating the current set of data values to the first set of registers, a hardware component (e.g., a CPU) can access the current set of data values without restriction.
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Retter Eric E.
Sutton John M.
Browne Lynne H.
Hoffman, Warnick and D'Alessandro LLC
International Business Machines - Corporation
Steinberg William H.
Trujillo James K.
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