Tnetx4090 thunderswitch ii, Switch – Texas Instruments THUNDERSWITCH II TNETX4090 User Manual
Page 67
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TNETX4090
ThunderSWITCH II
9-PORT 100-/1000-MBIT/S ETHERNET
SWITCH
SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999
67
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
MII transmit (see Figure 22)
NO.
MIN
MAX
UNIT
1
td(Mxx_TXD)
Delay time, from Mxx_TCLK
↑
to Mxx_TXD3–MxxTXD0 valid
5
15
ns
1
td(Mxx_TXEN)
Delay time, from Mxx_TCLK
↑
to Mxx_TXEN valid
5
15
ns
1
td(Mxx_TXER)
Delay time, from Mxx_TCLK
↑
to Mxx_TXER valid
5
15
ns
ОООООООООООООО
ОООООООООООООО
ОООООООООООООО
Mxx_TXD3–Mxx_TXD0
Mxx_TXEN
Mxx_TXER
1
Mxx_TCLK
Figure 22. MII Transmit
MII clock (see Figure 23)
NO.
MIN
MAX
UNIT
1
tr(Mxx_CLK)
Pulse width low Mxx_RCLK, Mxx_TCLK
35%
65%
2
th(Mxx_CLK)
Pulse width high Mxx_RCLK, Mxx_TCLK
35%
65%
3
tw(Mxx_CLK)
Cycle time Mxx_RCLK, Mxx_TCLK
2.5
25
MHz
Mxx_RCLK
Mxx_TCLK
1
2
3
Figure 23. MII Clock
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