bcm-v4

[Specification] 

Measuring feedthrough

G Mode Measurement Value (PHY Revision 2 or greater)

The G Mode Measurement value is constructed as follows:

Mask

Contents

0x8000

Set if BFL_EXTLNA is set in Board Flags and the PHY Revision is greater than 6

0x7000

Passed in LNA value

0x0F00

Passed in PGA value

0x0010

Always set

0x00E0

Passed in TRSW RX value

0x0003

Bandwidth Flags

Bandwidth Flags

Value

Usage

0x0001

Low Pass Filter

0x0002

Low Bandwidth (when set) / High Bandwidth (when unset)

Non G Mode

Mask

Usage

0x8000

Low Pass Filter

0xEFA0

Always set

0x0020

Low Bandwidth (when set) / High Bandwidth (when unset)

0x000F

Passed in PGA value

Measuring

  1. If the PHY Revision is 2 or greater:

    1. Write 0xE300 to PHY register 0x15

    2. Write the constructed value to the extended G PHY register 0x12

    3. Delay 10 microseconds

    4. Write the constructed value ORed with 2 to the extended G PHY register 0x12

    5. Delay 10 microseconds

    6. Write the constructed value ORed with 3 to the extended G PHY register 0x12

    7. Delay 10 microseconds

    8. Write 0xF300 to PHY register 0x15

  2. Otherwise:

    1. Write the passed in PGA value ORed with 0xEFA0 to PHY register 0x15

    2. Delay 10 microseconds

    3. Write the passed in PGA value ORed with 0xEFE0 to PHY register 0x15

    4. Delay 10 microseconds

    5. Write the passed in PGA value ORed with 0xFFE0 to PHY register 0x15

  3. Delay 21 microseconds

  4. Current feed-through value is available in PHY register 0x2D

Exported/Archived from the wiki to HTML on 2016-10-27