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DocID030538 Rev 3 193/226
STM32H743xI Electrical characteristics
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Figure 59. Ethernet SMI timing diagram
 
Table 111 gives the list of Ethernet MAC signals for the RMII and Figure 60 shows the 
corresponding timing diagram.
 
Figure 60. Ethernet RMII timing diagram
Table 112 gives the list of Ethernet MAC signals for MII and Figure 61 shows the 
corresponding timing diagram.
Table 111. Dynamics characteristics: Ethernet MAC signals for RMII
(1)
 
1. Guaranteed by characterization results.
Symbol Parameter Min Typ Max Unit
t
su(RXD)
Receive data setup time 2 - -
ns
t
ih(RXD)
Receive data hold time 3 - -
t
su(CRS)
Carrier sense setup time 2.5 - -
t
ih(CRS)
Carrier sense hold time 2 - -
t
d(TXEN)
Transmit enable valid delay time 4 4.5 7
t
d(TXD)
Transmit data valid delay time 7 7.5 11.5
MS31384V1
ETH_MDC
ETH_MDIO(O)
ETH_MDIO(I)
tMDC
td(MDIO)
tsu(MDIO)
th(MDIO)
ai15667b
RMII_REF_CLK
RMII_TX_EN
RMII_TXD[1:0]
RMII_RXD[1:0]
RMII_CRS_DV
t
d(TXEN)
t
d(TXD)
t
su(RXD)
t
su(CRS)
t
ih(RXD)
t
ih(CRS)
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