DP83867CS Datasheet, PDF (27/114 Pages) Texas Instruments – High Immunity, Small Form Factor 10/100/1000 Ethernet Physical Layer Transceiver

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DP83867CS, DP83867IS, DP83867E
SNLS504 – OCTOBER 2015
9.4.2.4 Write (No Post Increment) Operation
To write a register in the extended register set:
1. Write the value 0x001F (address function field = 00, DEVAD = 31) to register REGCR.
2. Write the desired register address to register ADDAR.
3. Write the value 0x401F (data, no post increment function field = 01, DEVAD = 31) to register REGCR.
4. Write the content of the desired extended register set register to register ADDAR.
Subsequent writes to register ADDAR (step 4) continue to rewrite the register selected by the value in the
address register.
Note: steps (1) and (2) can be skipped if the address register was previously configured.
9.4.2.5 Read (No Post Increment) Operation
To read a register in the extended register set:
1. Write the value 0x001F (address function field = 00, DEVAD = 31) to register REGCR.
2. Write the desired register address to register ADDAR.
3. Write the value 0x401F (data, no post increment function field = 01, DEVAD = 31) to register REGCR.
4. Read the content of the desired extended register set register to register ADDAR.
Subsequent reads from register ADDAR (step 4) continue reading the register selected by the value in the
address register.
Note: steps (1) and (2) can be skipped if the address register was previously configured.
9.4.2.6 Write (Post Increment) Operation
1. Write the value 0x001F (address function field = 00, DEVAD = 31) to register REGCR.
2. Write the register address from register ADDAR.
3. Write the value 0x801F (data, post increment on reads and writes function field = 10, DEVAD = 31) or the
value 0xC01F (data, post increment on writes function field = 11. DEVAD = 31) to register REGCR.
4. Write the content of the desired extended register set register to register ADDAR.
Subsequent writes to register ADDAR (step 4) write the next higher addressed data register selected by the
value of the address register; the address register is incremented after each access.
9.4.2.7 Read (Post Increment) Operation
To read a register in the extended register set and automatically increment the address register to the next
higher value following the write operation:
1. Write the value 0x001F (address function field = 00, DEVAD = 31) to register REGCR.
2. Write the desired register address to register ADDAR.
3. Write the value 0x801F (data, post increment on reads and writes function field = 10, DEVAD = 31) to
register REGCR.
4. Read the content of the desired extended register set register to register ADDAR.
Subsequent reads to register ADDAR (step 4) read the next higher addressed data register selected by the value
of the address register; the address register is incremented after each access.
9.4.2.8 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.
Copyright © 2015, Texas Instruments Incorporated
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