STM32F217VG datasheet(112/173 Pages) STMICROELECTRONICS

112 / 173 page

Electrical characteristics

STM32F21xxx

112/173

Doc ID 17050 Rev 8

Figure 45.

Ethernet SMI timing diagram

Table 61 gives the list of Ethernet MAC signals for the RMII and Figure 46 shows the

corresponding timing diagram.

Figure 46.

Ethernet RMII timing diagram

Table 60.

Dynamics characteristics: Ethernet MAC signals for SMI

Symbol

Rating

Min

Typ

Max

Unit

tMDC

MDC cycle time (2.38 MHz)

411

420

425

td(MDIO)

MDIO write data valid time

tsu(MDIO) Read data setup time

th(MDIO)

Read data hold time

Table 61.

Dynamics characteristics: Ethernet MAC signals for RMII

Symbol

Rating

Min

Typ

Max

Unit

tsu(RXD)

Receive data setup time

tih(RXD)

Receive data hold time

1.5

tsu(CRS)

Carrier sense set-up time

tih(CRS)

Carrier sense hold time

td(TXEN)

Transmit enable valid delay time

td(TXD)

Transmit data valid delay time

11.5

ETH_MDC

ETH_MDIO(O)

ETH_MDIO(I)

tMDC

td(MDIO)

tsu(MDIO)

th(MDIO)

ai15666d

RMII_REF_CLK

RMII_TX_EN

RMII_TXD[1:0]

RMII_RXD[1:0]

RMII_CRS_DV

td(TXEN)

td(TXD)

tsu(RXD)

tsu(CRS)

tih(RXD)

tih(CRS)

ai15667

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