Dual port ram with arbitration status register

Details Dual port ram with arbitration status register Dual port ram with arbitration status register

1988-05-13

1990-06-26

Heckler, Thomas M.

Boots, shoes, and leggings

36493701, 3649659, 36523005, G06F 1318

Patent

active

049377817

ABSTRACT:
A dual port RAM includes an arbiter (10) which interfaces between a random access memory (12) and two ports, a serial port (19) and a parallel port (21). The arbiter (10) has an internal arbitration byte (38) for storing status information. The arbiter operates in first and second modes. In the first mode, the serial port (19) is afforded priority access to the system with status information stored in the arbitration byte (38). The parallel port (21) polls the arbitration byte (38) to determine the system status. In the second mode, the first port to attempt access is provided priority and this information is stored in the arbitration byte (38). In this mode, each port attempting access must poll the arbitration byte (38) before attempting access.

REFERENCES:
patent: 4415972 (1983-11-01), Adcock
patent: 4580245 (1986-04-01), Ziegler et al.
patent: 4602253 (1986-07-01), Kreft
patent: 4616347 (1986-10-01), Bernstein
patent: 4627019 (1986-12-01), Ng
patent: 4627030 (1986-12-01), Barber
patent: 4633440 (1986-12-01), Pakulski
patent: 4660177 (1987-04-01), O'Connor
Bursky, "Talking over RF Links, Micropower ICs Transfer Data and Status", Aug. 25, 1988, issue of Electronics Design.

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