SPEAR1340 datasheet(165/200 Pages) STMICROELECTRONICS

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SPEAr1340

Timing characteristics

Doc ID 023063 Rev 4

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5.7.2

GMII receive timing characteristics

The timing characterization is performed assuming an input transition of 2 ns on all the

inputs and using MAC_RXCLK as source of clock for GMII RX interface timings extraction.

Figure 26.

GMII RX timing waveform

5.7.3

MII transmit timing characteristics

The timing characterization is performed assuming an output load capacitance of 10 pF on

the output pads and using a 2 ns transition on MAC_TXCLK for interface timings extraction.

These timings are valid for 10 and 100 Mbps operation.

Figure 27.

MII TX timing waveform

Table 74.

GMII RX timing characteristics

Parameter

Description(1)

Characterizations based on external clock sources are performed assuming an ideal 50% duty cycle clock.

Min

Max

Unit

TCLK

MAC_RXCLK clock period

–

TCLKhigh

MAC_RXCLK pulse high

2.5

–

TCLKlow

MAC_RXCLK pulse low

2.5

–

tsetup (Ts)

Setup time for GMII receive data

thold (Th)

Hold time for GMII receive data

0.5

MAC_RXD0 – MAC_RXD7,

MAC_RXER, MAC_RXDV

MAC_RXCLK

(input)

TCLKhigh

TCLKlow

MAC_TXCLK

(input)

MAC_TXD0 - MAC_TXD3,

MAC_TXEN, MAC_TXER

TCLKlow

TCLKhigh

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