Tx AV Traffic I/F
Errored Legacy Frame Transmission
tx_clk
tx_clk_enable
legacy_tx_data[7:0]
legacy_tx_data_valid
legacy_tx_ack
legacy_tx_underrun
DA | SA | L/T | DATA |
Figure 6-2: Legacy Frame Transmission with Underrun
The legacy_tx_underrun is provided to give full backwards compatibility between the Legacy Traffic I/F and the client interface of the
To error the frame, the legacy_tx_underrun signal may be asserted during the data transmission or up to 1 valid clock cycle after legacy_tx_data_valid goes low.
Tx AV Traffic I/F
The signals forming the Tx AV Traffic I/F are defined in Table
This interface is intentionally very similar to the “Tx Legacy Traffic I/F.” Note, however, that the legacy traffic does not contain a signal that is equivalent to av_tx_done. Additionally, the AV does not contain a signal that is equivalent to legacy_tx_underrun: no mechanism is currently provided on the AV interface to signal an error in a frame which is currently undergoing transmission.
Ethernet AVB Endpoint User Guide | www.xilinx.com | 59 |
UG492 July 23, 2010