User`s guide
LPC3250 Developer’s Kit - User’s Guide
Page 18
Copyright 2010 © Embedded Artists AB
4 QVGA Base Board Design
Please read the QVGA Base Board schematic for information about the board. Some additional
information about the QVGA Base Board is presented below.
4.1 QVGA Base Board Schematics
The QVGA Base Board contains a number of interfaces and connectors to the LPC3250 OEM Board.
The design can be viewed as a reference schematic for custom designs around the LPC3250 OEM
Board.
4.2 Signal Mapping to QVGA Base Board
The QVGA Base Board was originally developed for the LPC2478 processor and the associated
LPC2478 OEM Board in SODIMM format. The silk screen on the base board therefore reflects
the LPC2478 signal names.
The table below lists differences between the LPC3250 and LPC2478 OEM Boards in their SODIMM
interface. The table also lists what functionality that is connected to the different signals.
SODIMM
pin
number
LPC2478 OEM
Board
LPC3250 OEM
Board
QVGA Base Board
Comment
1
ETH_TXP
ETH_TXP
Ethernet i/f
2
ETH_RXP
ETH_RXP
Ethernet i/f
3
ETH_TXN
ETH_TXN
Ethernet i/f
4
ETH_RXN
ETH_RXN
Ethernet i/f
5
ETH_VDD
ETH_VDD
Ethernet i/f
6
ETH_GND
ETH_GND
Ethernet i/f
7
ETH_LED1
ETH_LED1
Ethernet i/f
8
ETH_LED2
ETH_LED2
Ethernet i/f
9
VBAT_IN
VBAT_IN
0.33F backup cap on vbat signal
10
ALARM
ONSW
Connected to alarm-LED (active high)
ONSW functionality
not demonstrated/
supported on
QVGA Base Board.
11
RESET_IN
RESET_IN
Connects to RESET push-button and USB-to-
serial bridge (for automatic ISP functionality)
12
RESET_OUT
RESET_OUT
Connects to RESET LED indicator.
Used to reset PCA9532 and QVGA display.
13
ETH_PHY_PD
ETH_PHY_PD
Part of Ethernet i/f, can be connected to
SODIMM pin 118
14
JTAG_DBGEN
JTAG_DBGEN
Connected to ‘JTAG Enable’ jumper
15
JTAG_TCK
JTAG_TCK
Connected to standard 20 pos (2x10 pin)
JTAG connector
16
JTAG_RTCK
JTAG_RTCK
Connected to standard 20 pos (2x10 pin)
JTAG connector
17
JTAG_NTRST
JTAG_NTRST
Connected to standard 20 pos (2x10 pin)
JTAG connector
18
JTAG_TMS
JTAG_TMS
Connected to standard 20 pos (2x10 pin)