VSC8504-02 datasheet(51/131 Pages) MICROSEMI

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Functional Descriptions

VMDS-10507 VSC8504-02 Datasheet Revision 4.2

3.17.10 Boundary Scan Register Cell Order

All inputs and outputs are observed in the boundary scan register cells. All outputs are additionally driven

by the contents of boundary scan register cells. Bidirectional pins have all three related boundary scan

The complete boundary scan cell order is available as a BSDL file format on the Microsemi Web site at

www.Microsemi.com.

3.18

100BASE-FX Halt Code Transmission and Reception

The VSC8504-02 device supports transmission and reception of halt code words in 100BASE-FX mode.

There are three separate scripts provided to initiate transmission of halt code words, stop transmission of

halt code words and detect reception of halt code words. Use the following scripts to implement each of

these functions:

Sending the HALT codeword:

PhyWrite(<phy>, 31, 0x52b5);

PhyWrite(<phy>, 16, 0xac82);

reg18 = PhyRead(<phy>, 18);

reg18 = (reg18 & 0xf0) | 0x0c;

PhyWrite(<phy>, 18, reg18);

PhyWrite(<phy>, 17, 0xe739);

PhyWrite(<phy>, 16, 0x8c82);

PhyWrite< <phy>, 16, 0xbe80);

reg17 = PhyRead(<phy>, 17);

reg18 = PhyRead(<phy>, 18);

reg17 = reg17 | 0x0040;

PhyWrite(<phy>, 18, reg18);

PhyWrite(<phy>, 17, reg17);

PhyWrite(<phy>, 16, 0x9e80);

PhyWrite(<phy>, 31, 0);

Stop sending the HALT codeword:

PhyWrite(<phy>, 31, 0x52b5);

PhyWrite< <phy>, 16, 0xbe80);

reg17 = PhyRead(<phy>, 17);

reg18 = PhyRead(<phy>, 18);

reg17 = reg17 & ~0x0040;

PhyWrite(<phy>, 18, reg18);

PhyWrite(<phy>, 17, reg17);

PhyWrite(<phy>, 16, 0x9e80);

PhyWrite(<phy>, 31, 0);

Detecting whether the HALT codeword is being sent by the link partner:

long patternset[5] = {

0xce739,

0xe739c,

0x739ce,

0x39ce7,

0x9ce73

};

Turning on the pattern checker:

PhyWrite(<phy>, 31, 0x52b5);

PhyWrite(<phy>, 16, 0xbe80);

reg18 = PhyRead(<phy>, 18);

reg17 = PhyRead(<phy>, 17);

reg17 = reg17 | 4;

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