SPEAR300 datasheet(69/83 Pages) STMICROELECTRONICS

部件名	SPEAR300

功能描述	Embedded MPU with ARM926 core, flexible memory support, powerful connectivity features and human machine interface

PDF	83 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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69 / 83 page

SPEAr300

Timing requirements

Doc ID 16324 Rev 2

69/83

6.5

Ether MAC 10/100 Mbps timing characteristics

The characterization timing is given for an output load of 5 pF on the MII TX clock and 10 pF

on the other pads. The operating conditions are in worst case V=0.90 V T=125° C and in

best case V=1.10 V T= 40° C.

6.5.1

MII transmit timing specifications

Figure 31.

MII TX waveforms

Figure 32.

Block diagram of MII TX pins

Note:

To calculate the tSETUP value for the PHY you have to consider the next tCLK rising edge, so

you have to apply the following formula: tSETUP = tCLK - tmax

Table 37.

MII TX timings

Parameter

Value using MII 10 Mb [tCLK

period = 40 ns 25 MHz]

Value using MII 100 Mb [tCLK

period = 400 ns 2.5 MHz]

tmax= t2max- t3min

6.8 ns

tmin= t2min- t3max

2.9 ns

tSETUP

33.2 ns

393.2 ns

Tmin

Tmax

MIITX_CLK

MII_TXD0-MII_TXD3,

MII_TXEN, MII_TXER

Tclock

SET

CLR

MII_TXCLK

MII_TX[0..3],

MII_TXEN, MII_TXER

CLK

MII_TX[0..3],

MII_TXEN, MII_TXER

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