Datasheet

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8
DP83620 DEMO BOARD USER GUIDE
2.7 SMA Connectors
For convenience, SMA connector J2 is provided to allow connection to the CLK_OUT pin. J2 can
be connected to the CLK_OUT pin by placing a 0 ohm resistor at R1. A 50 ohm resistor can be
placed at R2 to provide a terminating impedance for test equipment, if desired. J34 is unused
and reserved.
2.8 Table of Jumpers
Table 4. List of Jumpers
Jumper
Name
Function
Default
Setting
Power
J11/J12
Selects device 3.3 V source (Default MII_3V3)
J55
MII 5V/3V3
Bypasses 3.3 V regulator for 3.3 V MII supply
Open
MDIO/MDC Access
J3
MDC_SEL
Allows selection between USB, MII or parallel port
MDC source
Jumper to
PMDC_MII
J4
MDIO_SEL
Allows selection between USB, MII or parallel port
MDIO source
Jumper to
PMDIO_MII
J22
GND
Ground for parallel port source
Open
Address
J24
PHYAD0
PHY address strap pin
Open
J26
PHYAD1
PHY address strap pin
Open
Auto-Negotiation
J33
ACT
Force/Advertised operation mode in auto-
negotiation
Pulled High
J36
SPEED
Force/Advertised operation mode in auto-
negotiation
Pulled High
J39
LINK
Enable/Disable auto-negotiation
Pulled High
Reset
J8
RESET_N
Allows reset of DP83620
Open
J40
/RESET
Allows reset of USB interface device
Open
Function
J5
PWRDOWN/INTN
Allows for powerdown and interrupt modes
Open
J23
MII_MODE
Allows for MII_MODE strap option. Placing the
jumper forces the unit into RMII mode.
Open
J25
LED_CFG
Allows for LED configuration strap option
Open
J29
RMII_MAS
Allows for RMII_MAS strap option. Placing the
jumper forces the unit into RMII Master mode when
MII_MODE (J23) is strapped.
Open
J32
CLK_OUT_EN
Allows for CLK_OUT_EN strap option
Open
J35
PCF_EN
Allows for PCF_EN strap option
Open
J38
Reserved
Reserved
Open
J41
Reserved
Reserved
Open
J42
Reserved
Reserved
Open
J64
ALP EEPROM write control (Internal Use)
Open