SPEAR320S-2 datasheet(85/113 Pages) STMICROELECTRONICS

部件名	SPEAR320S-2

功能描述	Embedded MPU with ARM926 core for industrial and consumer applications

PDF	113 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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85 / 113 page

SPEAr320S

Timing requirements

Doc ID 022508 Rev 2

85/113

5.7

Ethernet MII timing characteristics

The timing characterization is performed assuming an output load capacitance of 5 pF on

the MII TX clock (MII#_TXCLK) and 10 pF on the other pads.

5.7.1

MII transmit timing characteristics

Figure 17.

MII TX waveform

Note:

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

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

Table 58.

EMI signals timing requirements

Direction

Signal name

Max

Min

Unit

EMI_A0-EMI_A23

8.612293

1.93584

EMD0-EMID15

9.471291

2.260195

EMI_CE0

8.764648

2.90581

EMI_CE1

7.977348

2.636304

EMI_CE2

9.027624

2.930175

EMI_CE3

9.29631

3.006315

EMI_BYTEN0

9.554388

3.092855

EMI_BYTEN1

9.233592

3.038856

EMI_RE

8.193018

2.680564

EMI_WE

8.172619

2.80189

EMI_D0-EMI_D15

10.8188

1.30245

Table 59.

MII TX timing requirements

Symbol

Description

Min

Max

Unit

tCK

MII#_TXCLK clock period

MII#_TXCLK to MII output data delay

3.34

11.86

MII#_TXCLK

MII#_TXD0-MII#_TXD3,

MII#_TXEN, MII#_TXER

tck

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