82555 — Networking Silicon
48 Datasheet
11.4.4 Transmit Packet Timing Parameters 11.4.5 Squelch Test Timing ParametersSymbol Parameter Conditions Min Typ Max Units
T15 TXEN_ST TXC on first TXEN active to start
of frame 100 Mbps 10 12 bits
T15a TXEN_ST TXC on first TXEN active to start
of frame 10 Mbps 3.5 5 bits
T16 TXEN_CRSH TXC on first TXEN active to
rising edge of CRS 100 Mbps 4 bits
T16a TXEN_CRSH TXC on first TXEN active to
rising edge of CRS 10 Mbps 1.5 bits
T17 TXEN_END TXC on first TXEN inactive to
end of frame 100 Mbps 17 bits
T17a TXEN_END TXC on first TXEN inactive to
end of frame 10 Mbps 5 bits
T18 TXEN_CRSL TXC on first TXEN inactive to
falling edge of CRS 100 Mbps 11 bits
T18a TXEN_CRSL TXC on first TXEN inactive to
falling edge of CRS 10 Mbps 6 bits
T19 TEOF End of frame high time 10 Mbps 250 350 ns
Figure 19. Transmit Frame Timing Parameters
TXEN
CRS
Valid Frame Data
TXCLK
Frame On link
T15,T15a
T16,T16a
T17,T17a
T18,T18a
Symbol Parameter Conditions Min Typ Max Units
T20 TSQE_DEL Collision detect heartbeat delay 10 Mbps 7 8 bits
T21 TSQE_DUR Collision detect heartbeat
duration 10 Mbps 9 11 bits