Multimode scan apparatus
US4819166A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1987 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | Apr 15, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2268
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a scan apparatus which provides an interface and control signals between a secondary computer and data locations in a host computer. The scan apparatus functions independently of the normal operation of the host computer. Scan-out is performed transparently to the operation of the host computer. The host computer is organized into a plurality of functional units. Each functional unit is constructed of circuits on semiconductor chips. The semiconductor chips are organized in blocks. In the present invention, each block within the host computer includes a multimode scan apparatus which controls the scan operations in connection with that block. The scan apparatus in each block is connected to the secondary computer by clock and scan lines. The scan apparatus on each block includes a multimode sequencer which is controlled by the secondary computer and independently of the operation of the host computer, executes the scan sequences for performing the scan operations associated with the block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.