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TNETX4090
ThunderSWITCH II
9-PORT 100-/1000-MBIT/S ETHERNET
SWITCH
SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999
63
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
transmit
PMA transmit (see Figure 17)
NO. MIN MAX UNIT
1 t
c(Mxx_GTCLK)
Cycle time, Mxx_GTCLK 8
†
8
†
ns
2,3 t
w(Mxx_GTCLK)
Pulse duration, Mxx_GTCLK low or high 40% 60% t
c(Mxx_GTCLK)
4 t
su(Mxx_TXD)
Setup time, Mxx_RXD7–Mxx_RXD0 valid before Mxx_GTCLK↑ 2 ns
4 t
su(Mxx_TXEN)
Setup time, Mxx_RXDV valid before Mxx_GTCLK↑ 2 ns
4 t
su(Mxx_TXER)
Setup time, Mxx_RXER valid before Mxx_GTCLK↑ 2 ns
5 t
h(Mxx_TXD)
Hold time, Mxx_RXD7–Mxx_RXD0 valid after Mxx_GTCLK↑ 1 ns
5 t
h(Mxx_TXDV)
Hold time, Mxx_RXDV valid after Mxx_GTCLK↑ 1 ns
5 t
h(Mxx_TXER)
Hold time, Mxx_RXER valid after Mxx_GTCLK↑ 1 ns
†
±100-ppm tolerance
Transmit
Clock
Transmit
Code Group
1
3
5
42
Figure 17. PMA Transmit