SPEAR1340 datasheet(167/200 Pages) STMICROELECTRONICS

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SPEAr1340

Timing characteristics

Doc ID 023063 Rev 4

167/200

5.7.5

MAC Ethernet asynchronous signals timing characteristics (MAC_CRS

and MAC_COL)

MAC_CRS and MAC_COL signals are used only by the GMII and MII interfaces.

Figure 29.

MAC asynchronous input signals timing waveform

5.7.6

MAC serial management channel timing characteristics (MDIO/MDC)

The MAC_MDIO and MAC_MDC signals are used to perform serial management channel

timing.

The MDC frequency should be equal to or less than 2.5 MHz to be compliant with the IEEE

802.3 MII specification. However, MAC can function correctly with a maximum MDC

frequency of 15 MHz.

Figure 30.

MAC_MDC/MAC_MDIO timing waveform

Table 77.

MAC asynchronous input signals timing characteristics

Symbol

Description

Min

Max

Unit

MAC_CRS to MAC_COL minimum pulse width

MAC_CRS, MAC_COL

Table 78.

MAC_MDC/MAC_MDIO timing characteristics

Symbol

Description

Min

Max

Unit

TCLK

MAC_MDC clock period

200

–

Falling edge of MDC to MDIO output delay(1)

TCLKhigh

MAC_MDC pulse width high

MAC_MDIO (input)

MAC_MDC

(output)

MAC_MDIO (output)

TCLKlow

TCLKhigh

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