METHOD AND APPARATUS FOR PROGRAMMABLE MEMORY CONTROL WITH ERROR REGULATION AND TEST FUNCTIONS

摘要

An electronic circuit (10) for controlling and testing up to eight banks (12) of RAMs (14l - 14n) includes a controller portion (20) for controlling accessing of the RAM banks to permit read and write operations to be carried out, and for initiating testing of the RAMs as well. The circuit (10) also includes a data path portion (22) for detecting parity errors in the data written to and read from the RAMs as well as for detecting errors which occur during testing initiated by thecontrol portion. An interface portion (24) may also be provided to allow test commands, status information and error data to be communicated to and from the circuit (10) across a four-wire boundary scan bus.