| 摘要 |
A data processing apparatus and method are provided for controlling a transfer of payload data over a communication channel. The data processing apparatus has initiator circuitry for initiating a transfer of payload data in a first clock cycle, and recipient circuitry for receiving the payload data the subject of the transfer in a later clock cycle. A communication channel is provided over which the payload data is passed from the initiator circuitry to the recipient circuitry along with associated transfer control information, timing of receipt of the payload data by the recipient circuitry being controlled by the transfer control information. Timing easing circuitry located within the communication channel is then used to temporarily buffer at least the transfer control information generated by the initiator circuitry before outputting that transfer control information to the recipient circuitry. The timing easing circuitry is responsive to a specified timing easing value to determine a time for which the transfer control information is temporarily buffered, whereby the number of clock cycles that elapse between the first clock cycle and the later clock cycle is dependent on the specified timing easing value. This hence enables a multi-cycle path to be provided for the transfer of payload data from the initiator circuitry to the recipient circuitry.
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