The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 1982
Filed:
Mar. 07, 1980
Norman F Brickman, Potomac, MD (US);
Bruno R Graziano, Damascus, MD (US);
IBM Corporation, Armonk, NY (US);
Abstract
The invention finds application in a TDMA communications controller having a plurality of i input/output ports. The input/output ports transfer data from respective, local data users to a transmit bus and transfer data from a receive bus to respective local users on a time interleaved basis during periodic TDMA frames. Each port operates at its own data rate R.sub.i, with data ports having different data rates in the controller. The invention includes a test card which has a read-only memory (ROM) for storing test patterns for each of the data rates R.sub.i. The test card further includes a random access memory (RAM) having an input connected to the ROM, for storing one of the test patterns from the ROM. The test card further includes a processor having control outputs to the RAM and the ROM for controlling the transfer of one of the test patterns from the ROM to the RAM for the data rate R.sub.j of the data port under test. The test card further includes a direct memory access (DMA) control connected between a data output from the RAM and the transmit bus and connected between a data input to the RAM and the receive bus.