STM32F405 datasheet(131/204 Pages) STMICROELECTRONICS

131 / 204 page

DS8626 Rev 9

131/203

STM32F405xx, STM32F407xx

Electrical characteristics

Ethernet characteristics

Unless otherwise specified, the parameters given in Table 64, Table 65 and Table 66 for

SMI, RMII and MII are derived from tests performed under the ambient temperature, fHCLK

frequency summarized in Table 14 and VDD supply voltage conditions summarized in

Table 63, with the following configuration:

•

Output speed is set to OSPEEDRy[1:0] = 10

•

Capacitive load C = 30 pF

•

Measurement points are done at CMOS levels: 0.5VDD.

Refer to Section 5.3.16: I/O port characteristics for more details on the input/output

characteristics.

Table 64 gives the list of Ethernet MAC signals for the SMI (station management interface)

and Figure 46 shows the corresponding timing diagram.

Figure 46. Ethernet SMI timing diagram

Table 65 gives the list of Ethernet MAC signals for the RMII and Figure 47 shows the

corresponding timing diagram.

Table 63. Ethernet DC electrical characteristics

Symbol

Parameter

Min.(1)

1. All the voltages are measured from the local ground potential.

Max.(1)

Unit

Input level

VDD

Ethernet operating voltage

2.7

3.6

Table 64. Dynamic characteristics: Ethernet MAC signals for SMI(1)

1. Guaranteed by characterization.

Symbol

Parameter

Min

Typ

Max

Unit

tMDC

MDC cycle time(2.38 MHz)

411

420

425

Td(MDIO)

Write data valid time

tsu(MDIO)

Read data setup time

th(MDIO)

Read data hold time

MS31384V1

ETH_MDC

ETH_MDIO(O)

ETH_MDIO(I)

tMDC

td(MDIO)

tsu(MDIO)

th(MDIO)

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