The PCM-DOC is a PC/104-compatible, solid state disk storage module that allows a designer to substitute flash memory in applications where the environment is too harsh for mechanical hard disk or floppy disk drives. It is designed to store programs or files with data retention
valid for at least 10 years.

FUNCTIONAL CAPABILITY
WinSystems' PCM-DOC is a flash disk storage module that will store up to 288 MBytes on a single board. Two versions are available to support different packaging styles of flash memory: DIP or TSOP-II.

The first version has a 32-pin DIP socket that is populated with the DiskOnChip2000®series of flash memory. It offers a wide selection of storage from 8 to 1 GigaBytes. The PCM-DOC-DXX is also offered with either no DiskOnChip® devices installed or with a DOC preinstalled
and tested at the factory. The "D" suffix in the product order code indicates the DIP version.

The second version is populated with up to four TSOP-II parts. The benefit of TSOP-II parts are that they are soldered directly to the board making the mounting more rugged. Therefore, they can withstand more shock and vibration than a part in a socket.

The maximum amount of TSOP-II memory currently supported on the PCM-DOC-TXX is 32 MBytes. The "T" suffix indicates TSOP-II parts are installed.

DiskOnChip2000® - The PCM-DOC module is based upon the M-Systems (Newark, CA) DiskOnChip®(DOC) flash disks. The DOC is offered in standard 32-pin DIP or TSOP-II packages to allow simple and robust mounting options for embedded systems. DOC has built-in TrueFFS (True Flash File System) technology, which provides full read/write disk emulation and hard disk compatibility at both the sector and file level.

True FFS® Technology - M-Systems' patented flash file software management technology allows the DOC to emulate a hard disk interface. Plus, it simplifies and enhances flash memories by using 3rd generation wear leveling. The benefit is that it ensures that all blocks are erased an equal number of times, which increases the life of the flash device by orders of magnitude. TrueFFS tests automatically for bad blocks during write and erase cycles and automatically swaps out a bad block without losing data. It also uses virtual blocking of the flash device to make the large erase blocks transparent to the operator.

TrueFFS provides built-in, enhanced 48-bit Reed-Solomon ECC/EDC logic for detection and correction capability for each 512-byte block of data. This ensures maximum data reliability even under stressful conditions, such as power failure.

PC/104 Interface - The PCM-DOC is memory mapped on 16Kbyte boundaries from D000 to E800. The jumper selectable decoder offers 23 unique locations in the PC extended memory address space between 640K and 1M.

Software Support - TrueFFS allows broad operating systems support including Linux, MS-DOS, Windows CE/95/98/NT, QNX, VxWorks, and others. Contact WinSystems Applications Engineering for the latest list.

M-Systems Replacement Board - The PCM-DOC replaces M-Systems' PC104-FD boards that are no longer available from them. Contact WinSystems for the latest configuration and ordering information.

PCM-DOC Profile - The module measures 3.6" x 3.8" (90mm x 96mm). If a DIP DiskOnChip2000 ® of 48MB or larger is ordered, its socketed height exceeds the 0.435" primary side dimension. This requires that the device be soldered directly into the board or that the PCM-DOC be mounted on the top of the PC/104 stack.

Temperature Range Options - The PCM-DOC board is offered with a standard temperature range from 0° to +70° Centigrade. Its part number has a "-C" suffix. As an option, the board can be populated with parts that operate over an extended industrial temperature range
of -40° to +85° Centigrade. Contact WinSystems' Applications Engineering Department for pricing, availability, and ordering information.

SPECIFICATIONS
Electrical
   PC/104 Bus: 16-bit stackthrough
   Memory Capacity
   DIP package: Upto 1 GigaBytes in a 32-pin socket
   TSOP-II package: 8, 16, 24, or 32 MBytes

Data Transfer Rates
   Read: 1.2 MBytes per second
   Write: Sustained: 500KBytes/sec

Power Requirements
   Vcc = +5V ±5% at 100mA (typical)

Mechanical
   Dimensions: 3.6" x 3.8" (90mm x 96mm)

Environmental
   Operating Temperature: 0° to +70°C standard
                                          -40° to +85°C optional
   Non-condensing relative humidity: 5% to 95%