SNLA340 October   2022 DP83TC811R-Q1 , DP83TC811S-Q1 , DP83TC812R-Q1 , DP83TC812S-Q1 , DP83TC814R-Q1 , DP83TC814S-Q1 , DP83TG720R-Q1 , DP83TG720S-Q1

 

  1.   DP83TC811, DP83TC812, DP83TC814, DP83TG720 Hardware Rollover Document
  2.   Trademarks
  3. 1Introduction
  4. 2Device Comparison
    1. 2.1 Pin Map Comparison
      1. 2.1.1 DP83TC811S
      2. 2.1.2 DP83TC811R
      3. 2.1.3 DP83TC812S
      4. 2.1.4 DP83TC812R
      5. 2.1.5 DP83TC814S
      6. 2.1.6 DP83TC814R
      7. 2.1.7 DP83TG720S
      8. 2.1.8 DP83TG720R
    2. 2.2 Feature Comparison
    3. 2.3 Pin Comparison Table
      1. 2.3.1 Strap Comparison
        1. 2.3.1.1 PHY Address Straps
        2. 2.3.1.2 MAC Interface, Master/Slave, Autonomous Strap
    4. 2.4 Power Supply Comparison
    5. 2.5 Design Parameters
    6. 2.6 MDI Comparison
    7. 2.7 CMC Comparison
    8. 2.8 SGMII Reference Schematics
    9. 2.9 RGMII Reference Schematics
  5. 3Summary

2.3.1.1 PHY Address Straps

Table 2-3 shows the PHY address strap comparison between DP83TC811, DP83TC812, DP83TC814, and DP83TG720.

DP83TC811 can support 16 PHY addresses from 0x00 to 0x0F. DP83TC812, DP83TC814, and DP83TG720 can support 9 PHY addresses: 0x00, 0x04, 0x05, 0x08, 0x0A, 0x0C, 0x0D, 0x0E, 0x0F. By provisioning for a pull up and pull down resistor on pin 14 and 15 of the PHY, all four devices can be supported by simply changing the resistor combination.

Table 2-3 PHY Address Strap Comparison Table
PIN NO. PIN NAME DP83TC811 DP83TC812, DP83TC814, DP83TG720
STRAP MODE Table 2-4 STRAP STRAP MODE Table 2-5 STRAP
15 RX_DV/CRS_DV/RX_CTRL (DP83TC81x)RX_CTRL (DP83TG720) PHYADD[0] PHYADD[2] PHYADD[0] PHYADD[2]
Mode 1 0 0 Mode 1 0 0
Mode 2 0 1 Mode 2 0 1
Mode 3 1 0 NA NA NA
Mode 4 1 1 Mode 3 1 1
14 RX_ER

(DP83TC81x)

STRAP_1 (DP83TG720)		 PHYADD[1] PHYADD[3] PHYADD[1] PHYADD[3]
Mode 1 0 0 Mode 1 0 0
Mode 2 0 1 Mode 2 0 1
Mode 3 1 0 NA NA NA
Mode 4 1 1 Mode 3 1 1

Table 2-4 shows strap resistor values for DP83TC811 and Table 2-5 show the recommended strap resistor values for DP83TC812, DP83TC814, and DP83TG720. RH are pull-up resistors and RL are pull down resistors.

Table 2-4 Recommended 4-level Strap Resistor Ratios For DP83TC811
MODE IDEAL RH (kΩ) IDEAL RL (kΩ)
1 OPEN OPEN
2 10 2.49
3 5.76 2.49
4 2.49 OPEN
Table 2-5 Recommended 3-level Strap Resistor Ratios for DP83TC812/814, DP83TG720
MODE IDEAL RH (kΩ)
for VDDIO = 3.3 V		 IDEAL RH (kΩ)
for VDDIO = 2.5 V		 IDEAL RH (kΩ)
for VDDIO = 1.8V
1 OPEN OPEN OPEN
2 13 12 4
3 4.5 2 0.8