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| STM32F427XX Datasheet, PDF (154/239 Pages) STMicroelectronics – ARM Cortex-M4 32b MCU+FPU, 225DMIPS, up to 2MB Flash/256+4KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 20 comm. interfaces, camera & LCD-TFT | |||
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Electrical characteristics
STM32F427xx STM32F429xx
Ethernet characteristics
Unless otherwise specified, the parameters given in Table 71, Table 72 and Table 73 for
SMI, RMII and MII are derived from tests performed under the ambient temperature, fHCLK
frequency summarized in Table 17 with the following configuration:
⢠Output speed is set to OSPEEDRy[1:0] = 10
⢠Capacitive load C = 30 pF for 2.7 V < VDD < 3.6 V
⢠Capacitive load C = 20 pF for 1.71 V < VDD < 3.6 V
⢠Measurement points are done at CMOS levels: 0.5VDD.
Refer to Section 6.3.17: I/O port characteristics for more details on the input/output
characteristics.
Table 71 gives the list of Ethernet MAC signals for the SMI (station management interface)
and Figure 47 shows the corresponding timing diagram.
Figure 47. Ethernet SMI timing diagram
(7+B0'&
W0'&
WG 0',2
(7+B0',2 2
(7+B0',2 ,
WVX 0',2
WK 0',2
069
Table 71. Dynamics characteristics: Ethernet MAC signals for SMI(1)
Symbol
Parameter
Min
Typ
Max Unit
tMDC MDC cycle time(2.38 MHz)
Td(MDIO) Write data valid time
tsu(MDIO) Read data setup time
th(MDIO) Read data hold time
1. Guaranteed by characterization results.
411
420
425
6
10
13
ns
12
-
-
0
-
-
154/238
DocID024030 Rev 9
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