CM-X255 Computer-On-Module
Description
The CM-X255 module is a tiny “system-on-module” computer, designed to serve as a building block in embedded applications. CM-X255 is advanced and backward-compatible version of original ARMCORE module, containing several significant improvements. The CM-X255 module has all the components needed to run operating systems such as Linux and Windows CE. Ready packages for these operating systems are available from CompuLab.
The CM-X255 is both small and inexpensive. Its small size allows integration into hand-held and mobile applications, providing a powerful computing core. Its exceedingly low price makes it an ideal selection for cost-sensitive applications. Based on Intel’s XScale architecture, the CM-X255 delivers a price/performance ratio significantly better than available from x86-based counterparts.
The feature set of the CM-X255 module combines a 32-bit CPU, SDRAM, Flash Disk and vital computing peripherals. For embedded applications, the CM-X255 provides a 32-bit PCI bus, 100Mbit Ethernet, serial ports, general purpose I/O lines and many other essential functions.
Standardized CAMI (“CompuLab’s Aggregated Module Interface”) connectors of CM-X255 module allow interchangeability with other CORE modules, enabling the flexibility required in a dynamic market where application requirements can change rapidly.
Software support for the CM-X255 includes ready-to-run packages for:
* Linux
* Windows CE
Features
- Full-featured Single Board Computer on module
- Basic configuration price below $50 !
- Intel’s XScale PXA255 CPU, up to 400 MHz, 32+32 KB cache
- General purpose bus and optional PCI, LPC, AC97 busses
- 16 – 64 Mbyte SDRAM
- 1 – 512 Mbyte Flash Disk
- Graphics Controller for STN and TFT panels
see LCD panel support - PCMCIA controller
- Sound codec with speaker and microphone support (optional)
- Touchscreen Controller (optional)
- Slave and host USB ports (optional)
- Standard peripherals: serial ports, LPT port, I/O ports, FDC, PS/2 keyboard and mouse, IrDA, HDD interface (optional)
- 10/100BaseT Ethernet port (optional)
- Power consumption below 1W
- 66 x 44 mm size
- Interchangeable with other CORE modules via CAMI connectors
- SBC-X255 – turns the CM-X255 module into a PC/104+ single board computer
Block diagrams
Specifications
“Option” column specifies the configuration code required to have the particular feature. “+” means that the feature is available always.
CPU & Core logic, Memory and Busses
| Feature | Specifications | Option |
|---|---|---|
| CPU | Intel XScale PXA255, 100 - 400 MHz | + |
| Address Space | 128 MB | + |
| Internal Bus | 32-bit, 100 MHz | + |
| Cache | 32 KB I-cache and 32 KB D-cache, WB | + |
| Core Logic | DMA and Interrupt controllers, Timers | + |
| RTC | Real Time Clock, powered by external lithium battery | R |
| DRAM | 16 - 64 MB, SDRAM, 100 MHz, 32-bit | + |
| NOR Flash Disk | 1 - 4 Mbytes | + |
| NAND Flash Disk | 16 - 512 Mbytes, optional | N |
| I/O Tolerance | Local Bus - 3.3V, PCI - 5V | + |
| External Busses | Local bus / PCMCIA, PCI, LPC, AC97 | |
| External local bus | 16-bit, variable rate up to 100 MHz | + |
| AC97 | AC97 / AMC97 Rev 2.1 compliant | + |
| PCI bus | 32-bit, 2.1-compliant, 132 MB/s, arbiter for 4 masters | B |
| LPC bus | Host, 33 MHz, Intel LPC v1.0 compatible | B |
| JTAG Interface | Available | + |
Peripherals
| Feature | Specifications | Option |
|---|---|---|
| Graphics Controller | 4/8/16 bit color, TFT / STN, resolution up to 1024 x 768, frame buffer in system SDRAM. | + |
| USB | One Slave port, 12 Mbps Two Host ports, 1.5 / 12 Mbps, OHCI v1.0 compliant | + B |
| Serial Ports (UARTs) | Up to 5 UART ports, 16550 compatible, max 230 - 960 kbps COM-A - RS232 Rx/Tx, partial modem COM-B - TTL, Rx/Tx COM-C - TTL, full modem COM-D - TTL, full modem COM-E - TTL, Rx/Tx, shared with FIR COM-F - TTL, partial modem. (shared with other essential funct. | + B + B.S + + |
| General Purpose I/O | 5 dedicated lines plus about 40 lines shared with other functions. Can be also used as interrupt inputs. | + |
| Hard Disk Interface | IDE, PIO mode | + |
| LPT - Parallel Port | Bi-directional with EPP mode. | B,S |
| Floppy Disk Interface | Routed through LPT pins | B,S |
| Keyboard Interface | PS/2 or redirection from COM | B,S |
| Mouse Interface | PS/2 | B,S |
| Infrared (IrDA) Port | Up to 115Kbps in SIR mode, 4Mbps in FIR mode | + |
| Ethernet | MAC & PHY, 10/100BaseT, Activity LED's. The ethernet port is implemented differently than in the previous version: Version 2 - Realtek 8139, on PCI bus. Requires Interface Bridge Version 3 - Davicom DM9000, on local bus | B,E E |
| Audio codec | Crystal CS4299 or Phillips UCB1400, AC97 interface, mono microphone input, stereo line input and 25 mW output for active speakers | A |
| Touchscreen ctrl. | A part of the UCB1400 codec chip. Supports resistive touch panels. (This feature is not available in the previous version 2 of CM-X255) | AT |
| PCMCIA controller | Direct support for 1st slot, hooks for 2nd slot, 8/16 bit interface | + |
Electrical, Mechanical and Environmental Specifications
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