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| LAN8740A Datasheet, PDF (120/136 Pages) Microchip Technology – Small Footprint MII/RMII 10/100 Energy Efficient Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology | |||
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LAN8740A/LAN8740Ai
FIGURE 5-4:
MII TRANSMIT TIMING
TXCLK
(OUTPUT)
tclkp
tclkh tclkl
tsu thold
tsu thold
TXD[3:0]
(INPUTS)
thold
TXEN, TXER
(INPUTS)
thold
tsu
TABLE 5-10: MII TRANSMIT TIMING VALUES
Symbol
tclkp
tclkh
tclkl
tsu
thold
t1
Description
Min.
TXCLK period
TXCLK high time
TXCLK low time
TXD[3:0], TXEN, TXER setup time
to rising edge of TXCLK
TXD[3:0], TXEN, TXER hold time
after rising edge of TXCLK
TXCLK rising edge after TXEN
assertion to RXDV assertion
(100 Mbps internal loopback
mode)
(see Note 1)
tclkp * 0.4
tclkp * 0.4
12.0
0
160
Typ.
Max.
tclkp * 0.6
tclkp * 0.6
162
Note 1: 40 ns for 100BASE-TX operation, 400 ns for 10BASE-T operation.
2: Timing was designed for system load between 10 pF and 25 pF.
Unit
Note
ns
ns
ns
ns (see Note 2)
ns (see Note 2)
ns (see Note 2)
DS00001987A-page 120
ï£ 2013-2015 Microchip Technology Inc.
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