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TNETX3270
ThunderSWITCH 24/3 ETHERNET SWITCH
WITH 24 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS
SPWS043B – NOVEMBER 1997 – REVISED APRIL 1999
60
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
serial MII management interface
timing requirements (see Figure 20)
NO. MIN MAX UNIT
1 t
su(MDIO)
Setup time, MDIO valid before OSCIN↑, read 7 ns
2 t
h(MDIO)
Hold time, MDIO valid after OSCIN↑, read 3 ns
operating characteristics over recommended operating conditions (see Figure 20)
NO. PARAMETER MIN MAX UNIT
3 t
d(MDIO)
Delay time, from OSCIN↑ to MDIO valid, write 11 ns
4 t
d(MDCLK)
Delay time, from OSCIN↑ to MDCLK↑ 11 ns
5 t
d(MRESET)
Delay time, from OSCIN↑ to MRESET↓ 11 ns
6 t
dis(MDIO)
Disable time, from OSCIN↑ to after MDIO to Z state, read 11 ns
7 t
dis(MDCLK)
Disable time, from OSCIN↑ to after MDCLK to Z state 11 ns
8 t
dis(MRESET)
Disable time, from OSCIN↑ to after MRESET to Z state 11 ns
9 t
en(MDIO)
Enable time, from OSCIN↑ to before MDIO valid 11 ns
10 t
en(MDCLK)
Enable time, from OSCIN↑ to before MDCLK valid 11 ns
11 t
en(MRESET)
Enable time, from OSCIN↑ to before MRESET valid 11 ns
OSCIN
(input)
MDCLK
(output)
MRESET
(output)
MDIO
(input/
output)
1 6 92
3
7 10
8
4
5
Z
Z
Z
Read InputWrite Output
11
Figure 20. Serial MII Management Read/Write Cycle