SPC58EEX datasheet(115/154 Pages) STMICROELECTRONICS

115 / 154 page

DS11646 Rev 4

115/154

SPC58EEx, SPC58NEx

Electrical characteristics

128

Figure 37. DSPI slave mode — modified transfer format timing (MFTE = 0/1) CPHA = 1

3.18.3

Ethernet timing

The Ethernet provides both MII and RMII interfaces. The MII and RMII signals can be

configured for either CMOS or TTL signal levels compatible with devices operating at either

5.0 V or 3.3 V. Please check the device pinout details to review the packages supporting MII

and RMII.

3.18.3.1

MII receive signal timing (RXD[3:0], RX_DV, RX_ER, and RX_CLK)

The receiver functions correctly up to a RX_CLK maximum frequency of 25 MHz +1%.

There is no minimum frequency requirement. The system clock frequency must be at least

equal to or greater than the RX_CLK frequency.

Note:

In the following table, all timing specifications are referenced from RX_CLK = 1.4 V to the

valid input levels, 0.8 V and 2.0 V.

Last Data

SIN

SOUT

First Data

Data

SCK Input

(CPOL = 0)

(CPOL = 1)

tDIS

tSUI

tHI

tSUO

tHO

Table 61. MII receive signal timing

Symbol

Characteristic

Value

Unit

Min

Max

CC D RXD[3:0], RX_DV, RX_ER to RX_CLK setup

—

CC D RX_CLK to RXD[3:0], RX_DV, RX_ER hold

—

CC D RX_CLK pulse width high

35%

65%

RX_CLK period

CC D RX_CLK pulse width low

35%

65%

RX_CLK period

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