MULTI-CYCLE DELAY FOR COMMUNICATION BUSES

摘要

A system is disclosed that may compensate for bus timing that may vary over operating conditions of a bus. The system may include a communication bus, a first functional unit configured to transmit data via the communication bus, and a second functional unit configured to receive data via the bus. The first functional unit may transmit a first value via the communication bus to the second functional unit. The first functional unit may be further configured to assert a data valid signal responsive to a determination that a first time period has elapsed since the transmission of the first data value. The second functional unit may be configured to receive the first data value and sample the first data value dependent upon the data valid signal.

主权项

1. A system, comprising:
a communications bus; a first functional unit, coupled to the communications bus, wherein the first functional unit is configured to:
transmit a first data value on the communications bus; andassert a data valid signal responsive to a determination that a first time period has elapsed since the transmission of the first data value; and a second functional unit, coupled to the communications bus, wherein the second functional unit is configured to:
receive the transmitted first data; andsample the received first data responsive to the assertion of the data valid signal; wherein the first functional unit is further configured to:
de-assert the data valid signal responsive to a determination that a second data value is ready to transmit; andtransmit the second data value on the communications bus responsive to a determination that a second time period has elapsed since the de-assertion of the data valid signal.