Electrical characteristics
Figure 32. Ethernet RMII timing diagram
STM32F105xx, STM32F107xx
RMII_REF_CLK
td(TXEN)
td(TXD)
RMII_TX_EN
RMII_TXD[1:0]
tsu(RXD)
tsu(CRS)
tih(RXD)
tih(CRS)
RMII_RXD[1:0]
RMII_CRS_DV
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Table 50. Dynamic characteristics: Ethernet MAC signals for RMII
Symbol
Rating
Min
Typ
Max
Unit
tsu(RXD)
tih(RXD)
tsu(DV)
Receive data setup time
Receive data hold time
4
2
4
2
8
7
ns
ns
ns
ns
ns
ns
Carrier sense set-up time
Carrier sense hold time
tih(DV)
td(TXEN)
td(TXD)
Transmit enable valid delay time
Transmit data valid delay time
10
10
16
16
Table 51 gives the list of Ethernet MAC signals for MII and Figure 32 shows the
corresponding timing diagram.
Figure 33. Ethernet MII timing diagram
MII_RX_CLK
t
t
t
t
t
t
su(RXD)
su(ER)
su(DV)
ih(RXD)
ih(ER)
ih(DV)
MII_RXD[3:0]
MII_RX_DV
MII_RX_ER
MII_TX_CLK
t
t
d(TXEN)
d(TXD)
MII_TX_EN
MII_TXD[3:0]
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Doc ID 15274 Rev 6
STMICROELECTRONICS [ ST ]
