System for programming EEPROM with data loaded in ROM by sending switch signal to isolate EEPROM from host system
US5276839A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1991 |
| Grant date | Jan 4, 1994 |
| Priority date | — |
| Expiry date | Mar 7, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/102
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An EEPROM programming circuit is disclosed which provides for the on-board rogramming of a EEPROM memory using: a microprocessor, a bootstrap ROM, a UART communications port, and a Eccles-Jordan flip flop switch system. These elements are electrically connected to a host system and the EEPROM by a central data bus. In normal operation, the host system sends a first set of data signals through the circuit to the EEPROM, which produces a set of processed signals. In operation in the programming mode the host system sends a second set of data signals to cause the microprocessor to send a switch signal to the Eccles-Jordan flip flop switch and to the bootstrap ROM. The bootstrap ROM contains the program code that forms the programs that are used to program the EEPROM. The Eccles-Jordan flip flop switch works with the communications port to serve as a means of isolating the EEPROM from the host system and directly connecting to EEPROM is the bootstrap ROM for programming when receiving the switch signal from the microprocessor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.