Motorola Corporation

Boaz Shahar

Udi Barel

Alon Ratinsky

Ido Reuveny

In a Plug and Play environment different kinds of EEPROMs can be used having different access protocols without having to add an additional pin to the EEPROM to indicate its type. The first type of EEPROM has a code which indicates the first type stored on a predetermined address whereas the second type of EEPROM having a different read protocol has another code which indicates the second type stored on a consecutive address. When the Plug and Play controller accesses the EEPROM for a read either the code 1 or code 2 is outputted whereby the appropriate read protocol is identified.

Method for determining a type of a serial EEPROM and plug and play

A circuit (100) comprises a built-in test circuit (150) which verifies the proper operation of input cells (130) when they receive signals at a first level (71) and at a second level (72). The test circuit (160) comprises a first and a second logic (110, 120) which receive power only when a test is performed. Thereby power consumption of the test circuit (160) is reduced. The first and the second logic (110, 120) are conveniently formed by a combination of parallel coupled transistors acting in an logical OR-function.

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Givataim, Israel

Boaz Shahar