Roger W Peters

US Patent:

51094940, Apr 28, 1992

Filed:

Jun 22, 1990

Appl. No.:

7/541446

Inventors:

Peter N. Ehlig - Houston TX
Roger W. Peters - Houston TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G06F 1300

US Classification:

395325

Abstract:

A passive interface between a processor and a peripheral device is shown. The peripheral device could also be another processor. The interface allows asynchronous communication between the devices. Speed limitations are minimized as the processor has the ability within the interface to know when it can send data, and when it has received data. The number of interface pins is also minimized. Also, communication between devices can still be performed even if the devices have different data bus widths.

US Patent:

51014980, Mar 31, 1992

Filed:

Sep 7, 1990

Appl. No.:

7/581160

Inventors:

Peter N. Ehlig - Houston TX
Roger W. Peters - Houston TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G06F 1300
G06F 900

US Classification:

395800

Abstract:

A processor which has two different communications modes, a test mode, an an emulator mode is shown. These modes are selected by controlling inputs to two pins. More modes could be added with more pins. When a given mode is switched into, certain I/O pins instantly change function. Minimal hardware and software is required to implement a switch thus allowing rapid switches.