VSC8540RT datasheet(52/87 Pages) MICROCHIP

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VSC8540RT

DS60001603E-page 52

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6.4

Extended Page 2 Registers

To access the extended page 2 registers (16E2–30E2), enable extended register access by writing 0x0002 to register

31. For more information, see Table 6-27.

When extended page 2 register access is enabled, reads and writes to registers 16–30 affect the extended registers

16E2–30E2 instead of those same registers in the IEEE-specified register space. Registers 0–15 are not affected by

the state of the extended page register access.

Writing 0x0000 to register 31 restores the main register access.

The following table lists the addresses and register names in the extended register page 2 space. These registers are

accessible only when the device register 31 is set to 0x0002.

6.4.1

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 set-

tings 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 Microchip

representative

TABLE 6-35:

EXTENDED REGISTERS PAGE 2 SPACE

Address

Name

16E2

Cu PMD Transmit Control

17E2

EEE Control

18E2–19E2

Reserved

20E2

RGMII Control

21E2

Wake-on-LAN MAC Address [15:0]

22E2

Wake-on-LAN MAC Address [31:16]

23E2

Wake-on-LAN MAC Address [47:32]

24E2

Secure-On Password [15:0]

25E2

Secure-On Password [31:16]

26E2

Secure-On Password [47:32]

27E2

Wake-on-LAN and MAC Interface Control

28E2

Extended Interrupt Mask

29E2

Extended Interrupt Status

30E2

Reserved

TABLE 6-36:

CU PMD TRANSMIT CONTROL, ADDRESS 16E2 (0X10)

Bit

Name

Access

Description

Default

15:12 Reserved

Reserved

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