SNLA456 April   2024 DP83822H , DP83822HF , DP83822I , DP83822IF , DP83826E , DP83826I , DP83848C , DP83848H , DP83848I , DP83848J , DP83848K , DP83848M , DP83848T , DP83848VYB , DP83848YB

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Additional Benefits of DP83826
  6. 3Hardware Differences
    1. 3.1 Power Supply and Special Connection Requirements
    2. 3.2 Media Dependent Interface Requirements
    3. 3.3 Hardware Strapping
  7. 4Summary
  8. 5References

3.3 Hardware Strapping

DP83848 and DP83826 share some common strappable configurations as shown in Table 3-1. Pin numbers are shown in ( ):

Table 3-1 DP83848 and DP83826 Common Strappable Configurations
PHYDP83848 LQFPDP83848 QFNDP83826
PHY Address [0]COL (42)COL (35)LED0 (30)
PHY Address [1]RX_D0 (43)RX_D0 (36)CRS/LED3 (29)
PHY Address [2]RX_D1 (44)RX_D1 (37)COL/LED2 (28)
Auto-Negotiation EnableLED_ACT/COL (26)N/ARX_D0 (16)
Auto-MDIX EnableRX_ER (41)RX_ER (34)RX_D1 (15)
MAC InterfaceRX_DV (39)

TX_D3 (6)

RX_DV (32)RX_D2 (14) (If strapped Odd Nibble enabled)

DP83848 has some exclusive functions that can be strapped as described in Table 3-2. Pin numbers are shown in ( ):

Table 3-2 DP83848 Exclusive Functions
PHYDP83848 LQFPDP83848 QFN
PHY Address [3]RX_D2 (45)RX_D2 (38)
PHY Address [4]RX_D3 (46)RX_D3 (39)
Speed/Duplex Configuration

LED_SPEED (27)

LED_LINK (28)

LED_SPEED (21)

LED_LINK (22)

LED ConfigurationCRS (40)CRS (33)

DP83826 has some exclusive functions that can be strapped as described in Table 3-3. Pin numbers are shown in ( ):

Table 3-3 DP83826 Exclusive Functions
StrapDP83826 Pin Name (Number)
Manual MDI/MDIX Configuration (Applicable if Auto-MDIX is disabled)RX_DV (18)
CLKOUT FunctionalityRX_ER (20)
Odd Nibble EnableCLKOUT/LED1 (31)
Type of RMIITX_CLK (22)
RMII RepeaterRX_D3 (13) (if strapped to RMII)
Fast Link Drop ConfigurationRX_D3 (13) (if strapped to MII)
Signal Detect Configuration of Fast Link DropRX_D2 (14) (if strapped to Odd Nibble Disable with FLD enabled)

As there are many dependencies in DP83826 for bootstrapping, Figure 3-6 can help decipher the different configurations available.

DP83826 Enhanced Mode Strapping FlowchartFigure 3-6 DP83826 Enhanced Mode Strapping Flowchart