Little Board/P5x Technical Manual
be stacked directly on top of the Little Board/P5x using its PC/104-Plusexpansion bus interface as a rugged and reliable interconnect.
The Little Board/P5x module’s on-board EIDE, video interfaces, and optional SCSI interface are internally connected to its PCI bus. In addition, you can attach PCI peripherals to the board’s stackable PCI bus expansion connector in much the same way PC/104 modules are stacked on the PC/104 connectors. The PCI expansion connector consists of 4 rows of 30 pins (120-pin header), and carries all of the appropriate PCI signals to accommodate up to 4 PCI add-on modules. The bus operates at clock speeds up to 33 MHz.
Compact Flash Disk
The Compact Flash interface allows you to substitute solid-state Flash memory for a conventional rotating-media drive. Any DOS-based application, including the operating system, utilities, drivers, and application programs, can easily be run from the Compact Flash device without modification
The Compact Flash disk is a solid-state disk system that emulates an IDE drive. It uses standard Compact Flash disk media, similar to a PCMCIA memory card, but smaller. Insert the Compact Flash disk media in the on-board Compact Flash socket, and use it in much the same way you would use a removable-media hard drive. The Compact Flash drive is architecturally equivalent to an IDE drive in your system. When installed, it becomes one of the two IDE drives supported by the primary EIDE disk controller. It can be configured as either an IDE master or slave drive.
Serial Ports
The Little Board/P5x provides four PC-compatible RS-232C serial ports, implemented using
16C550-type UARTs. These UARTs are equipped with 16-byte FIFO buffers to improve throughput.
Serial 1 through Serial 4 are configured for RS-232 operation and are compliant with standard PC serial port specifications. The ports’ RS-232 level shifters incorporate built-in voltage pumps to generate RS-232 voltage levels from the system +5V supply.
You can optionally configure Serial 1 for RS-485 operation. In addition, Serial 2 and Serial 4 provide connections for TTL-level serial signals.
Parallel Port
An enhanced bi-directional parallel port interface conforms to the IEEE-1284 standard. It provides features attractive to embedded system designers, including increased speed, an internal FIFO buffer, and DMA transfer capability.
Floppy Interface
An on-board floppy disk interface provides access to standard floppy drives. The interface supports up to two floppy drives, 5.25 inch or 3.5 inch, in any combination. All standard floppy drive types, from 360K 5.25 inch to 1.44M 3.5 inch are supported.
PCI-Bus EIDE Interfaces
On-board PCI EIDE/Ultra DMA/33 interfaces provide high-speed hard disk, IDE CD-ROM drive, and other IDE device access. The interfaces support up to four IDE devices (via primary and secondary drive interfaces). The interfaces are fully compliant with the AS/NSIS ATA Rev. 3.0
