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| LAN9500 Datasheet, PDF (199/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode | |||
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8.5.5 MII INTERFACE TIMING
This section specifies the MII interface transmit and receive timing.
FIGURE 8-5:
MII TRANSMIT TIMING
TXCLK
TXD[3:0]
TXEN
tclkp
tclkh tclkl
tval
tval
thold
LAN950x
thold
tval
TABLE 8-18: MII TRANSMIT TIMING VALUES
Symbol
Description
tclkp
TXCLK period
tclkh
TXCLK high time
tclkl
TXCLK low time
tval
TXD[3:0], TXEN output valid from rising edge of
TXCLK
thold
TXD[3:0], TXEN output hold from rising edge of
TXCLK
MIN
40
tclkp*0.4
tclkp*0.4
0
TYP
tclkp*0.6
tclkp*0.6
22.0
Note 8-14 Timing was designed for system load between 10 pf and 25 pf.
MAX
ns
ns
ns
ns
ns
Notes
Note 8-14
Note 8-14
FIGURE 8-6:
MII RECEIVE TIMING
RXCLK
RXD[3:0]
thold
RXDV
tclkp
tclkh tclkl
tsu thold
tsu thold
thold
tsu
ï£ 2010 - 2015 Microchip Technology Inc.
DS00001875A-page 199
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