LAN9500 Datasheet, PDF (201/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

8.5.6 TURBO MII INTERFACE TIMING
This section specifies the Turbo MII interface transmit and receive timing.
FIGURE 8-7:
TURBO MII TRANSMIT TIMING
TXCLK
TXD[3:0]
TXEN
t_clkp
t_clkh t_clkl
t_val
t_val
t_hold
LAN950x
t_hold
t_val
TABLE 8-20: TURBO MII TRANSMIT TIMING VALUES
Symbol
t_clkp
t_clkh
t_clkl
t_val
t_hold
Description
TXCLK period
TXCLK high time
TXCLK low time
TXD[3:0], TXEN output valid from rising edge of
TXCLK
TXD[3:0], TXEN output hold from rising edge of
TXCLK
MIN
20
t_clkp*0.4
t_clkp*0.4
1.5
TYP
t_clkp*0.6
t_clkp*0.6
12.5
Note 8-16 Timing was designed for system load between 10 pf and 15 pf.
MAX
ns
ns
ns
ns
ns
Notes
Note 8-16
Note 8-16
FIGURE 8-8:
TURBO MII RECEIVE TIMING
RXCLK
RXD[3:0]
t_hold
RXDV
t_clkp
t_clkh t_clkl
t_su t_hold
t_su t_hold
t_hold
t_su
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DS00001875A-page 201