DP83867CS datasheet(31/129 Pages) TI2

31 / 129 page

Instruction

Example: Read register 0x0170 & 0x0171

1. Write the value 0x001F (address function field = 00, DEVAD = 31)

to register REGCR.

Write register 0x0D to value 0x001F

2. Write the desired register address to register ADDAR.

Write register 0x0E to value 0x0170

3. Write the value 0x801F (data, post increment on reads and writes

function field = 10, DEVAD = 31) to register REGCR.

Write register 0x0D to value 0x801F

4. Read the content of the desired extended register set register to

Read register 0x0E

5. Subsequent reads to register ADDAR (step 4) reads the next

higher addressed data register selected by the value of the address

Read register 0x0E

Step 4 Reads register 0x0170 and because post increment is enabled, Step 5 reads register 0x0171.

7.4.2.1.7 Example of Read Operation Using Indirect Register Access

Read register 0x0170.

1. Write register 0x0D to value 0x001F.

2. Write register 0x0E to value 0x0170

3. Write register 0x0D to value 0x401F.

4. Read register 0x0E.

The expected default value is 0x0C10.

7.4.2.1.8 Example of Write Operation Using Indirect Register Access

Write register 0x0170 to value 0x0C50.

1. Write register 0x0D to value 0x001F.

2. Write register 0x0E to value 0x0170

3. Write register 0x0D to value 0x401F.

4. Write register 0x0E to value 0x0C50.

This write disables the output clock on the CLK_OUT pin.

7.4.3 Auto-Negotiation

All 1000BASE-T PHYs are required to support Auto-Negotiation. The Auto-Negotiation function in 1000BASE-T

has three primary purposes:

• Auto-Negotiation of Speed and Duplex Selection

• Auto-Negotiation of Master or Slave Resolution

• Auto-Negotiation of Pause or Asymetrical Pause Resolution

7.4.3.1 Speed and Duplex Selection - Priority Resolution

The Auto-Negotiation function provides a mechanism for exchanging configuration information between the two

ends of a link segment. This mechanism is implemented by exchanging Fast Link Pulses (FLP). FLPs are burst

pulses that provide the signalling used to communicate the abilities between two devices at each end of a link

segment. For further details regarding Auto-Negotiation, refer to Clause 28 of the IEEE 802.3 specification. The

DP83867 supports 100BASE-TX and 1000BASE-T modes of operation. The process of Auto-Negotiation verifies

that the highest performance protocol is selected (that is, priority resolution) based on the advertised abilities of

the Link Partner and the local device.

7.4.3.2 Master and Slave Resolution

If 1000BASE-T mode is selected during the priority resolution, the second goal of Auto-Negotiation is to resolve

Master or Slave configuration. The Master mode priority is given to the device that supports multiport nodes,

such as switches and repeaters. Single node devices such as DTE or NIC card takes lower Master mode priority.

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DP83867CS, DP83867IS, DP83867E

SNLS504F – OCTOBER 2015 – REVISED JANUARY 2025

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