High Speed Serial Co-processor

With an RT302 installed in your PC you get the benefit of Motorola's industry standard 20 MHZ 68000 microprocessor core, aided by an embedded RISC processor to handle communication related overhead. By utilizing Realtime's 16-bit I/O mapped architecture and the Intel 80XXX rep insw/outsw assembler instructions to move data from and to the board, data exchange between the PC and the RT302 approaches two million bytes per second. Instead of waiting for an external processor to retrieve the next byte from its on-board queue or wait for it to put your data into its buffer, you can communicate at bus bandwidth. The following code segments illustrate the kind of communicating you will be doing when you install the RT302 in your application.

   unsigned int data_length, *data_ptr;

   while (data_length--)         /* retrieve total frame via this loop        */
      *data_prt++ = inpw(RT302); /* get frame from board                      */

or for even faster access (at bus bandtwidth speeds) use in-line assembler:

   asm mov CX, data_length       /* setup count for following rep instruction */
   asm mov SI, data_ptr          /* set the source address for data access    */
   asm rep outsw(RT302)          /* blast data onto the board                 */

	UART, SDLC / HDLC, BISYNC, and more
	Synchronous baud rates to 1 Mbps, async to 384 Kbps
	128K byte static ram on board for program and user data buffers
	Boards may be cascaded to provide up to 32 independent ports on a PC
	Bus bandwidth data exchange between PC and the RT302, approximately 1.0µs / 16-bit xfer
	Uses internal and external clocking and has the capability to synch or source clocks
	Dual port DB9 male connectors with RS-232 or multidrop cable RS485 line drivers
	Intelligent interrupt capability threshold. character / address recognition, etc.
	"C" source code available to integrate your software with the RT302 board program and to tailor your needs