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Electrical characteristics STM32H743xI
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Figure 58. ULPI timing diagram
 
Ethernet characteristics
Unless otherwise specified, the parameters given in Table 110, Table 111 and Table 112 for 
SMI, RMII and MII are derived from tests performed under the ambient temperature, 
f
rcc_c_ck
 frequency summarized in Table 23: General operating conditions, with the following 
configuration:
• Output speed 
is set to OSPEEDRy[1:0] = 10
• Capacitive load C = 20 pF
• Measurement points are done at CMOS levels: 0.5V
DD
.
Refer to Section 6.3.15: I/O port characteristics for more details on the input/output 
characteristics.
Table 110 gives the list of Ethernet MAC signals for the SMI and Figure 59 shows the 
corresponding timing diagram.
 
Table 110. Dynamics characteristics: Ethernet MAC signals for SMI
(1)
 
1. Guaranteed by characterization results.
Symbol Parameter Min Typ Max Unit
t
MDC
MDC cycle time(2.5 MHz) 400 400 403
ns
T
d(MDIO)
Write data valid time  1 1.5  3
t
su(MDIO)
Read data setup time 8 - -
t
h(MDIO)
Read data hold time 0 - -
Clock
Control In
(ULPI_DIR,
ULPI_NXT)
data In
(8-bit)
Control out
(ULPI_STP)
data out
(8-bit)
t
DD
t
DC
t
HD
t
SD
t
HC
t
SC
ai17361c
t
DC
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