Patents Assigned to Metalink Corporation
  • Patent number: 4939637
    Abstract: An emulator circuit utilizes an Intel 8031 microprocessor with external address and data buses to emulate an Intel 8051 single chip microcomputer with no external buses by providing external registers into which the contents of the internal 8031 "Port 0" and "Port 2" registers are output and functionally "recreated". An internal emulation mode is generated in the 8031 wherein internal SFR latch contents are output to the port leads during one state and the port drivers are tri-stated to allow in-level reading of the levels of the port leads during another state. The emulator circuit generates a "Force Ports" pulse that causes the "recreated" port registers of the external circuitry to "force" external "logic" levels onto the 8031" Port 0 and Port 2 leads.
    Type: Grant
    Filed: August 24, 1988
    Date of Patent: July 3, 1990
    Assignee: Metalink Corporation
    Inventor: Martin B. Pawloski
  • Patent number: 4809167
    Abstract: An emulator circuit utilizes an Intel 8031 microprocessor with external address and data buses to emulate an Intel 8051 single chip microcomputer with no external buses by providing external registers into which the contents of the internal 8031 "Port 0" and "Port 2" registers are output and functionally "recreated". The external access (EA) lead is toggled to make the 8031 function as an 8051 during the states in which the 8051 samples its logic levels and destroys port 0 latches if configured as an 8031. Toggling the EA lead to a high level causes outputting the contents of the Port 0 and Port 2 latches to their respective leads. The emulator circuit generates a "Force Ports" pulse that causes the "recreated" port registers or the external circuitry to "force" external logic levels onto the 8031 Port 0 and Port 2 leads.
    Type: Grant
    Filed: February 10, 1988
    Date of Patent: February 28, 1989
    Assignee: Metalink Corporation
    Inventors: Martin B. Pawloski, Shekhar Y. Borkar