SPC574K72E5 datasheet(102/127 Pages) STMICROELECTRONICS

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Electrical characteristics

SPC574Kxx

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DocID023601 Rev 5

3.17.3

FEC timing

3.17.3.1

RMII serial management channel timing (MDIO and MDC)

The FEC functions correctly with a maximum MDC frequency of 2.5 MHz.

9tSUI

Data Setup Time for Inputs(2) —

—

tHI

Data Hold Time for Inputs(2) —

—

tSUO

SOUT Valid Time(2),(3),(4)

(after SCK edge)

Very

Strong

25 pF

—

Strong

50 pF

—

Medium

50 pF

—

tHO

SOUT Hold Time(2),(3),(4)

(after SCK edge)

Very

Strong

25 pF

2.5

—ns

Strong

50 pF

2.5

—ns

Medium

50 pF

2.5

—ns

DSPI slave operation is only supported for a single master and single slave on the device. Timing is valid for that case only.

Input timing assumes an input slew rate of 1 ns (10% - 90%) and uses TTL / Automotive voltage thresholds.

All timing values for output signals in this table, are measured to 50% of the output voltage.

All output timing is worst case and includes the mismatching of rise and fall times of the output pads.

Table 53. DSPI CMOS Slave timing - Modified Transfer Format (MTFE = 0/1)(1)(Continued)

Symbol

Characteristic

Condition

Min

Max

Unit

Pad Drive

Load

The FEC provides RMII in the eLQFP176 and FusionQuad packages. 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.

Table 54. RMII serial management channel timing(1)(2)

Symbol

Characteristic

Value(3)

Unit

Min

Max

M10

MDC falling edge to MDIO output invalid

(minimum propagation delay)

-10

—

M11

MDC falling edge to MDIO output valid (max

prop delay)

—25

M12

MDIO (input) to MDC rising edge setup

—

M13

MDIO (input) to MDC rising edge hold

—

M14

MDC pulse width high

40%

60%

MDC period

M15

MDC pulse width low

40%

60%

MDC period

All timing specifications are referenced from MDC = 1.4 V (TTL levels) to the valid input and output levels, 0.8 V and 2.0 V

(TTL levels). For 5 V operation, timing is referenced from MDC = 50% to 2.2 V/3.5 V input and output levels.

RMII timing is valid only up to a maximum of 150 oC junction temperature.

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