Visible to Intel only — GUID: bhc1395127801831
Ixiasoft
Visible to Intel only — GUID: bhc1395127801831
Ixiasoft
6.7. Avalon® Streaming Flow Control Signals
Signal | Operating Mode | Direction | Width | Description |
---|---|---|---|---|
avalon_st_pause_data[] | All | In | 2 | This signal takes effect when the register bits, tx_pauseframe_enable[2:1], are both set to the default value 0.
Set this signal to the following values to trigger the corresponding actions.
|
avalon_st_tx_pause_length_valid | All | In | 1 | This signal is present in the MAC TX only variation. Assert this signal to request the MAC IP core to suspend data transmission. When you assert this signal, ensure that a valid pause quanta is available on the avalon_st_tx_pause_length_data bus. |
avalon_st_tx_pause_length_data[] | All | In | 16 | This signal is present in the MAC TX only variation. Use this bus to specify the pause quanta in unit of quanta, where 1 unit = 512 bits time. |
avalon_st_tx_pfc_gen_data[] | 10G | In | n (4–16) |
n = 2 x Number of PFC queues parameter. Each pair of bits is associated with a priority queue. Bits 0 and 1 are for priority queue 0, bits 2 and 3 are for priority queue 1, and so forth. Set the respective pair of bits to the following values to trigger the specified actions for the corresponding priority queue.
|
avalon_st_rx_pfc_pause_data[] | 10G | Out | n (2–8) |
n = Number of PFC queues parameter. When the MAC RX receives a pause frame, it asserts bit n of this signal when the pause quanta for the n th queue is valid (Pause Quanta Enable [n] = 1) and greater than 0. For each quanta unit, the MAC RX asserts bit n for eight clock cycle. The MAC RX deasserts bit n of this signal when the pause quanta for the n th queue is valid (Pause Quanta Enable [n] = 1) and equal to 0. The MAC RX also deasserts bit n when the timer expires. |
avalon_st_rx_pause_length_valid | All | Out | 1 | This signal is present in the MAC RX only variation. The MAC IP core asserts this signal to request its link partner to suspend data transmission. When asserted, a valid pause quanta is available on the avalon_st_rx_pause_length_data bus. |
avalon_st_rx_pause_length_data[] | All | Out | 16 | This signal is present only in the MAC RX only variation. Specifies the pause quanta in unit of quanta, where 1 unit = 512 bits time. |