STA1295 datasheet(100/109 Pages) STMICROELECTRONICS

100 / 109 page

Electrical characteristics

STA1295, STA1275

100/109

DS12586 Rev 5

4.14.7

Ethernet interface timing

The following tables provide the timings for the Ethernet interface.

In RGMII mode 1Gbit/sec speed, operation is double-data-rate.

In all other modes, the active clock edge (data launch and data capture) is the rising clock

edge.

Timings are provided taking the active edges at SoC side as reference.

Table 66. RGMII mode - 1Gbit/sec operation

Type

Symbol

Min Max Unit Load

Notes

Clock

CLK freq

—

125 MHz 10 pF

—

CLK period

—

10 pF

CLK duty cycle

—

Input

TIS

—

TIH

—

Output Todly

-0.5

0.5

10 pF

Data is launched in double data rate (on both of

the clock edges)

Table 67. RGMII mode - 100Mbit/sec operation

Type

Symbol

Min Max Unit Load

Notes

Clock

CLK freq

—

MHz 10 pF

—

CLK period

—

10 pF

CLK duty cycle

—

Input

TIS

—

TIH

—

Output Todly

-0.5

0.5

10 pF

Table 68. RGMII mode - 10Mbit/sec operation

Type

Symbol

Min Max Unit Load

Notes

Clock

CLK freq

—

2.5

MHz 10 pF

—

CLK period

400

—

10 pF

CLK duty cycle

—

Input

TIS

—

TIH

—

Output Todly

-0.5

0.5

10 pF

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