SNLA338A January   2020  – August 2022 DP83826E

 

  1.   KSZ8081MNX/RNB to DP83826 System Rollover
  2.   Trademarks
  3. 1Purpose
  4. 2Required Changes
    1. 2.1 Strap Resistor Value
    2. 2.2 External Capacitor on Pin 2
    3. 2.3 Duplex Strap on Pin 16 (DP83826 Basic Mode)
    4. 2.4 Selecting 10M with Auto-Negotiation Enabled (DP83826 Basic Mode)
    5. 2.5 Configuring LED_1 for Tx and Rx Activity for EtherCAT Slave (DP83826 Basic Mode)
    6. 2.6 Thermal Pad Adjustments in Layout
    7. 2.7 Physical Layer ID Register
  5. 3Potential Changes
    1. 3.1 MDIO Pull-Up Resistor on Pin 11
    2. 3.2 MDIO Register Writes
    3. 3.3 Capacitors on Center Tap of Magnetics
  6. 4Informational Changes
  7. 5Pinout Mapping
    1. 5.1 Pin Mapping
  8. 6DP83826 Strap Configurations
    1. 6.1 Bootstrap Configurations
  9. 7Revision History

2.7 Physical Layer ID Register

The PHY Identifier Register #1 (PHYIDR1) and #2 (PHYIDR2) allow system software to determine applicability of device specific software based on the vendor model number. The Identifiers Register #1 and Register #2 can be found in sections 9.5.3 and 9.5.4 of the DP83826 Datasheet. The vendor model number is represented by bits 9 to 4 in PHYIDR2 (Address 0x3) outlined below.

Table 2-5 PHYID Comparison
Register AddressRegister NameRegister DescriptionDevice
DP83826KSZ8081MNX/RNB
0x03PHYIDR2PHY ID 20x010001b - BASIC
0x010011b - ENHANCED		0x010110b