Altera HyperTransport MegaCore Function Manual do Utilizador descarregar pdf (Página 39)

Chapter 3: Specifications 3–13

HyperTransport MegaCore Function Specification

Preliminary

When the attached HT device has a limited number of Rx buffers (on the order of four

or less), you can adjust the HyperTransport MegaCore function clocking option to

minimize the loop time. In this case, the flow control loop time is critical for

maintaining high throughput on HT link traffic transmitted from the HyperTransport

MegaCore function. By adjusting the clocking option, you can remove either the Tx

FIFO buffer or both the Tx and Rx FIFO buffers. Removing one or both buffers

increases throughput by removing the latency through the FIFO buffers. If you must

maintain maximum throughput on a single virtual channel with a small number of Rx

buffers, then use either the Shared Ref/Tx Clock or Shared Rx/Tx/Ref Clock option.

Using the Shared Ref/Tx Clock option removes the Tx FIFO buffer. Using the Shared

Rx/Tx/Ref Clock option removes both the Tx and Rx FIFO buffers.

Refer to Table A–3 on page A–3 and Table A–4 on page A–3 for information about the

clocking option and Rx buffer size parameters.

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Altera HyperTransport MegaCore Function Manual do Utilizador Página 39