Hardware documentation mp900c

From JLiMe.com

1 Introduction
2 Hardware inside the NEC Mobilepro 900/c
3 Memory Map
4 PXA255 pins
5 Connectors
- 5.1 Serial I/O
- 5.2 JTAG
6 Official Datasheets
7 Handmade documents

Introduction

On this page we show the hardware of the NEC Mobilepro 900/c.

Hardware inside the NEC Mobilepro 900/c

CPU : Intel PXA255 at 400MHz
ROM : Intel Strataflash 128J3C150 x2
RAM : Samsung K4S561632E-TC75 x2
User Flash : M-systems Disk On Chip MD3831-D32-V3-X
Graphics : Epson S1D13806 display controller. DTSN LCD panel
USB Host/Client : Philips ISP1161A1
Sound : Wolfson Microelectronics WM8731 audio codec
Input : Touchscreen and Keyboard controlled by PIC16LF877 chip
Compactflash & 16-bit PCMCIA: NeoMagic NMC1110 x2

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Memory Map

NOTE: this is unconfirmed information that has been gleaned from posts and pages all over the internet. So take it with a grain of salt until somebody confirms it.

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ROM

32 MB of NOR Flash Memory : 0x00000000 - 0x01FFFFFF
32 MB of NOR Flash Memory : 0x02000000 - 0x03FFFFFF

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Video

Video controller regs : 0x0C000000 - 0x0C100000
Video memory buffer : 0x0C200000 - 0x0C340000

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USB

0x0D000000 - HC data port - (R/W)
0x0D000001 - DC data port - (R/W)
0x0D000002 - HC command port - (W)
0x0D000003 - DC command port - (W)

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NeoMagic NMC1110

0x20000000 - CompactFlash slot
0x30000000 - PCMCIA slot
0x09000000 - PRS/PRC register (CF)
0x0A000000 - PRS/PRC register (PCMCIA)

see comments in pxa2xx_mp900.c for details

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PXA255 pins

GPIO0 - irq 8 - Power (input)
GPIO1 Reset (input)

GPIO2 - irq 34 - ?
GPIO3 - irq 35 - ?
GPIO4 - irq 36 - ?

GPIO16 PMW0 - ?

GPIO61 - USB INT1

GPIO5 - irq 37 - PRDY (CF ready/busy)
GPIO7 - irq 39 - PRDY (PCMCIA)
GPIO11 as nCD (CF card detect)
GPIO13 as nCD (PCMCIA card detect)
GPIO75 - irq 101 - CF (ide0)
GPIO76 - irq 103 - ethernet card (PCMCIA)

HWUART - irq 7
STUART - irq 20

I2S audio interface to Wolfson WM8731
GPIO28 I2S_BITCLK_OUT
GPIO29 I2S_SDATA_IN
GPIO30 I2S_SDATA_OUT
GPIO31 I2S_SYNC
GPIO32 I2S_SYSCLK

FFUART - irq 22 - RS232 connector
GPIO34 FFUART_RXD
GPIO35 FFUART_CTS
GPIO36 FFUART_DCD
GPIO37 FFUART_DSR
GPIO38 FFUART_RI
GPIO39 FFUART_TXD
GPIO40 FFUART_DTR
GPIO41 FFUART_RTS

BTUART - irq 21 - communication with keyboard and touchscreen controller
GPIO42 BTUART_RXD
GPIO43 BTUART_TXD

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Connectors

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Serial I/O

Honda 9-pin 0.5mm pitch connector for serial. Honda did manufacture the connector on the mp900c. It must have been a custom part as they don't have the 9-pin version in their product lineup. I contacted them about finding the 9-pin plug that goes with the socket and ~~I have yet to receive a reply.~~ it was a custom part that they no longer make. They do have a 16-pin version that is exactly the same as the connector on the mp900 mobo.

The serial I/O connector is driven by a MAX3243 chip made by Texas Instruments. The MAX3243 is designed to connect to a DB9S RS-232 connector/cable like so:

The MAX3243 is connected to the Honda serial I/O connector like so:

MAX3243           Honda Connector  DB9
RIN1  pin 4  ------- pin 4  ------- 
RIN2  pin 5  ------- pin 1  ------- 4
RIN3  pin 6  ------- pin 6  ------- 7 RTS
RIN4  pin 7  ------- pin 3  ------- 3 Rx
RIN5  pin 8  ------- pin 7  ------- 
DOUT1 pin 9  ------- pin 8  ------- 1, 6
DOUT2 pin 10 ------- pin 2  ------- 8 CTS
DOUT3 pin 11 ------- pin 5  ------- 2 Tx
GND   pin 25 ------- pin 9  ------- 5 GND

So, if we be able to get some 9-pin Honda connectors, we'll be able to create our own serial dongles. Until then, I am going to just solder a small dongle directly to the mobo. See mp900 rs232 solder points.

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JTAG

The JTAG socket on the mobo is ~~a Molex PicoBlade~~ an unknown connector. I ordered some Molex PicoBlade male connectors and they don't fit. They are too large. The JTAG page has more information on this connector and interfacing with the mp900 over JTAG.

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