Datasheet

October 2006
Tung Ngo
v1.1
National Semiconductor Corp 5
DP83849 Demo II Specification
Overview
The DP83849 Demo II is a National Semiconductor demo platform to allow customer evaluation of our
device. While the DP83849 has many advanced and enticing features, this specific board is designed to
demonstrate only a subset of those. The features chosen are the ones that the mainstream customers will
use. Thus we have created an affordable, aesthetic platform to demonstrate the simplicity of designing in a
National Semiconductor DP83849.
Target Environment
Equipment that provides standard IEEE 802.3 MII, RMII or SNI interface; e.g. SmartBits/Netcom
Features/Goals
The DP83849 Demo II features:
o Multiple PHY Addresses – Default are 00h (Port A), 01h (Port B) with increment even values
through 30h (Port A) and odd values through 31h (Port B).
o 9 LEDs – 1 power, 2 INTERRUPT, 6 others (2 LINK, 2 SPEED, 2 ACT/COL) dependant on LED
mode selected
o Strap Options for Ports (A and B) – ED_EN, MDIX_EN, LED_CFG, Auto-Negotiation
o FX_EN jumper - Port B only
o SNI_MODE resistor – Work with MII_MODE pin to set 10 Mb SNI mode. See Strap Options of
datasheet for details.
o MII_MODE resistor – To set RMII mode. See Strap Options section of datasheet for details.
o EXTENDER_EN jumper – To set into Extender mode that DP83849IVS and DP83849IFVS
support. See each datasheet respestively for details.
o CLK2MAC_DIS jumper – To disable clock to MAC output.
o RESET_N jumper – To allow external reset.
o PWR_DWN/INT jumper – To set the device into Interrupt mode.
• Connections for the following interfaces:
o MII Interface
o 2 x RJ-45, 1 x FX (Port B)
o Header for “ribbon cable” connection to MII/RMII/SNI
o JTAG header
o CLK2MAC header
o Integrity Interface header
• Standard PCB layout considerations with regards to clock, MII, and TD/RD
• On-board clock – Crystal/Oscillator Dual Footprint – 25/50 MHz
o Crystal (default) – Should be depopulated for RMII option.
o Oscillator – Resistor stuff option for RMII to bring in external 50 MHz oscillator
• On-board power supplied by 5V/3V MII connector (A/B), or POE connector (J91)
• Dual sided component placement
• Low cost