USB 2.0 to 10/100 Ethernet Controller
Datasheet
8.5.5
MII Interface Timing
This section specifies the MII interface transmit and receive timing.
t
clkp
t
clkh
TXCLK
t
val
t
clkl
t
val
t
hold
TXD[3:0]
t
hold
TXEN
Figure 8.5 MII Transmit Timing
t
val
Table 8.18 MII Transmit Timing Values
SYMBOL
t
clkp
t
clkh
t
clkl
t
val
t
hold
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
0
DESCRIPTION
MIN
40
t
clkp
*0.4
t
clkp
*0.4
t
clkp
*0.6
t
clkp
*0.6
22.0
MAX
UNITS
ns
ns
ns
ns
ns
NOTES
Note 8.14
Timing was designed for system load between 10 pf and 25 pf.
Revision 1.1 (04-18-13)
DATASHEET
58
SMSC LAN950x Family