DP83848C: PHYIDR Register Contents

Russ Meyer

Part Number: DP83848C

I am attempting to differentiate between the DP83848VV VBI and DP83848KSQ PHY chips. To do this, I am reading the PHYIDR registers. When I read the PHYIDR2 register on my DP83848VV VBI, I get the value 0x5C90. Looking at bits 9 through 4, I see the value 0x09 (0b00 1001). However, the datasheet section 6.6.1.1.4 PHY, "Identifier Register #2 (PHYIDR2)," seems to indicate this value should be 0x0A (0b001010). What am I missing?

Datasheet Used: "DP83848C/I/VYB/YB PHYTER™ QFP Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver," SNLS266E – MAY 2007 – REVISED MARCH 2015

Summing up:

Chip: DP83848VV VBI
Datasheet PHYIDR2[9:4]: 0x0A
Actual Value Read: 0x09 <-- HUH? Does not match datasheet. What am I missing?

Chip: DP83848KSQ
Datasheet PHYIDR2[9:4]: 0x09
Actual Value Read: 0x09 <-- Matches Datasheet. Looks good.

over 6 years ago

0 Geet Modi over 6 years ago

TI__Mastermind 26320 points

Hello Mr. Meyer,

Give me few days to get the details on this.

Regards,
Geet

0 Geet Modi over 6 years ago in reply to Geet Modi

TI__Mastermind 26320 points

Hello Mr. Meyer,

Further, please rely on the values read on actual device. We have taken a note to update datasheet.

Regards,
Geet

0 Russ Meyer over 6 years ago in reply to Geet Modi

Prodigy 20 points

If PHYIDR2[9:4] are identical on both the DP83848VV VBI and DP83848KSQ, how can the type of chip be identified programmatically?

0 Ross Pimentel over 6 years ago in reply to Russ Meyer

TI__Mastermind 23675 points

Hi Russ,

There are no registers to distinguish the two devices.

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DP83848C: PHYIDR Register Contents