SMSC LAN9500 - Manual (Page 37)

Hi-Speed USB 2.0 to 10/100 Ethernet Controller
Datasheet
SMSC LAN9500/LAN9500i 37 Revision 1.7 (10-02-08)
DATASHEET
4.5.5 Turbo MII Interface Timing
The external MII supports Turbo MII and the interface timing is as follows.
Note 4.12 These values satisfy the MII specification requirement of 0 ns to 25 ns clock to output
delay.
Note 4.13 Timing was designed for system load between 5 pf and 15 pf.
Figure 4.1 Turbo MII Output Timing
Table 4.12 Turbo MII Output Timing Values
SYMBOL DESCRIPTION MIN MAX UNITS NOTES
t
outdly
Clock to output delay for TXD and TXEN 12.5 ns Note 4.12
Note 4.13
t
txhold
TXD and TXEN hold time after TXCLK 1.5 ns Note 4.13
Figure 4.2 Turbo MII Input Timing
TXEN
TXD[3:0]
TXCLK
CRS
t
outdly
t
txhold
RXDV
RXD[3:0]
RXCLK
CRS
t
rxsetup
t
rxhold