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TDA4VM: J784S4X - SGMII Interface using DP83TC812R-Q1

Sagar Jadhav
Prodigy 70 points
Part Number: TDA4VM
Other Parts Discussed in Thread: DP83TC812R-Q1

We would like to use DP83TC812R-Q1 for SGMII interface, but TRM document shows 1Gbps bit rate and 100Mhz Clock and datasheet of DP83TC812R-Q1 shows 100Mbps bit rate and 25Mhz Clock speed. Can we use DP83TC812R-Q1 in our interface?

Reference Schematic: J784S4X Evaluation Board
Rev: E2
Ver: 3.1
File Name: PROC141E2(001)_SCH
Reference: TRM- Page 4239, Table 12-182
                   Datasheet- DP83TC812R-Q1, Page 54 & 55

  • 0
    TI__Mastermind 44120 points

    The SERDES operates at 1.25Gbaud regardless of 10/100/1G rates.  10 and 100 Mbps operation over SGMII uses symbol replication to deal with the slower rates.  At 100Mbps the symbols are sent ten times, and at 10Mbps they are sent one hundred times.  This appears to align with the DP83TC812 data sheet comments posted.