VSC8504-02 datasheet(78/131 Pages) MICROSEMI

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Registers

VMDS-10507 VSC8504-02 Datasheet Revision 4.2

4.4.1

Cu PMD Transmit Control

The register at address 16E2 consists of the bits that provide control over the amplitude settings for the

transmit side Cu PMD interface. These bits provide the ability to make small adjustments in the signal

amplitude to compensate for minor variations in the magnetics from different vendors. Extreme caution

must be exercised when changing these settings from the default values as they have a direct impact on

the signal quality. Changing these settings also affects the linearity and harmonic distortion of the

transmitted signals. For help with changing these values, contact your Microsemi representative.

Table 56 •

Cu PMD Transmit Control, Address 16E2 (0x10)

Bit

Name

Access Description

Default

15:12 1000BASE-T signal

amplitude trim(1)

R/W

Sticky bits.

1000BASE-T signal amplitude

1111: -1.7%

1110: -2.6%

1101: -3.5%

1100: -4.4%

1011: -5.3%

1010: -7%

1001: -8.8%

1000: -10.6%

0111: 5.5%

0110: 4.6%

0101: 3.7%

0100: 2.8%

0011: 1.9%

0010: 1%

0001: 0.1%

0000: -0.8%

0000

11:8

100BASE-TX signal

amplitude trim(2)

R/W

Sticky bits.

100BASE-TX signal amplitude

1111: -1.7%

1110: -2.6%

1101: -3.5%

1100: -4.4%

1011: -5.3%

1010: -7%

1001: -8.8%

1000: -10.6%

0111 5.5%

0110: 4.6%

0101: 3.7%

0100: 2.8%

0011: 1.9%

0010: 1%

0001: 0.1%

0000: -0.8%

0010

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