DP83TG720SWRHATQ1 datasheet(51/199 Pages) TI

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7.6 Register Maps

7.6.1 Register Access Summary

There are two different methods for accessing registers within the field. Direct register access method is only

allowed for the first 31 registers (0x0h through 0x1Fh) of MMD1F register space. Registers beyond 0x1Fh must

be accessed by use of the Indirect Method (Extended Register Space) described in Section 7.4.11.

Table 7-20. MMD Register Space Division

MMD REGISTER SPACE

MMD1F

0x000 - 0x0EFD

MMD1

0x1000 - 0x1904

MMD3

0x3000 - 0x390D

MMD7

0x7000 - 0x7200

Table 7-21. Register Access Summary

0x0h through 0x1Fh

Direct Access

Indirect Access, MMD1F = '11111'

Example: to read register 0x17h in MMD1F field with no post increment

Step 1) write 0x1Fh to register 0xDh

Step 2) write 0x17h to register 0xEh

Step 3) write 0x401Fh to register 0xDh

Step 4) read register 0xEh

MMD1F Field

0x20h - 0xFFFh

Indirect Access, MMD1F = '11111'

Example: to read register 0x462h in MMD1F field with no post increment

Step 1) write 0x1Fh to register 0xDh

Step 2) write 0x462h to register 0xEh

Step 3) write 0x401Fh to register 0xDh

Step 4) read register 0xEh

MMD1 Field

0x0000h - 0x0FFFh

Indirect Access, MMD1 = '00001'

Example: to read register 0x7h in MMD1 field with no post increment

Step 1) write 0x1h to register 0xDh

Step 2) write 0x7h to register 0xEh

Step 3) write 0x4001h to register 0xDh

Step 4) read register 0xEh

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DP83TG720S-Q1

SNLS604 – SEPTEMBER 2020

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