Clock synchronous memory embedded semiconductor integrated circuit device
US5991232A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 28, 1998 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Aug 28, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C29/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A semiconductor integrated circuit device includes an SDRAM module operating in synchronization with a clock signal, a logic circuit transmitting data with the SDRAM module for effecting necessary processing, a direct memory access circuit taking in and transferring an externally applied signal in synchronization with the clock signal corresponding to an operation clock of the SDRAM module, and a selector selecting either the output signal of the logic circuit and the output signal of the direct memory access circuit in accordance with a test mode instructing signal for application to the SDRAM module. A test of a synchronous memory can be performed by externally making fast and direct access to the synchronous memory without an influence of a skew in a signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.