DP83640: Register offset for PHY_LINK_PARTNER_SPD

lding

Part Number: DP83640

Hi Champs,

I have some TI EVMs using this PHY and the source code tried to access a PHY register called PHY_LINK_PARTNER_SPD via MDIO read. In older code: the PHY_LINK_PARTNER_SPD is defined as offset 10u. However, newer code this is defined as 16u.

I looked at http://www.ti.com/lit/ds/symlink/dp83640.pdf, Table 5-9. Register Map

08h-0Fh 8-15 RESERVED RESERVED
10h 16 RO PHYSTS PHY Status Register

It looks that 10u is reserved and 16u is PHY status.

Q1. Can you clarify the correct offset of this PHY_LINK_PARTNER_SPD?

Q2. Can you give the bit level explanation of the register? E.g, how do I interpret the readback value?

Regards, Eric

over 6 years ago

0 Aniruddha Khadye over 6 years ago

TI__Mastermind 18425 points

Hi Eric,

Which source code are you using? Register 0x10 is the PHY Status Register and details for this register are in the datasheet page 72-73. Maybe the code uses different number formats to refer to the same register since Hex 10 is same as Decimal 16.

-Regards

Aniruddha

0 lding over 6 years ago in reply to Aniruddha Khadye

TI__Guru* 95265 points

Hi,

The code was used for TI Hercules ARM Corex MCU. The EVMs use 83640PHY. In the source code,

@@ -29,6 +29,7 @@

#define PHY_ID2 (3u)
#define PHY_AUTONEG_ADV (4u)
#define PHY_LINK_PARTNER_ABLTY (5u)
+#define PHY_LINK_PARTNER_SPD (10u)
#define PHY_TXTS (28u)
#define PHY_RXTS (29u)

I didn't find this offset 10 from datasheet. Can you clarify what it is?

Regards, Eric

0 lding over 6 years ago in reply to lding

TI__Guru* 95265 points

Any update?

-Eric

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DP83640: Register offset for PHY_LINK_PARTNER_SPD