Datasheet

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STM32F745xx STM32F746xx Electrical characteristics
195
Table 86 gives the list of Ethernet MAC signals for the RMII and Figure 56 shows the
corresponding timing diagram.
Figure 56. Ethernet RMII timing diagram
Table 85. Dynamics characteristics: Ethernet MAC signals for SMI
(1)
1. Guaranteed by characterization results.
Symbol Parameter Min Typ Max Unit
t
MDC
MDC cycle time(2.38 MHz) 400 400 403
ns
T
d(MDIO)
Write data valid time 10 10.5 12.5
t
su(MDIO)
Read data setup time 12.5 - -
t
h(MDIO)
Read data hold time 0 - -
Table 86. 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 1 - -
ns
t
ih(RXD)
Receive data hold time 1.5 - -
t
su(CRS)
Carrier sense setup time 1 - -
t
ih(CRS)
Carrier sense hold time 1 - -
t
d(TXEN)
Transmit enable valid delay time 5 6 10.5
t
d(TXD)
Transmit data valid delay time 5 6 12
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