发明名称 |
Peripheral device controller with an EEPROM with microinstructions for a RAM control store |
摘要 |
A peripheral device controller has an EEPROM which stores microinstructions to be placed in a random access memory control store. The EEPROM also stores peripheral configuration information. This information is obtained by polling the peripheral devices connected to the controller and storing the resulting information in the EEPROM. Upon powering up, the microinstructions stored in the EEPROM are transferred to the control store via execution of instructions held in a boot PROM. The controller, therefore, provides a fast control store while maintaining permanence of the microinstructions after power is extinguished. Means are also provided to update the control store and EEPROM. The EEPROM may upon CPU command be updated with new microinstructions held in main memory or obtained from peripheral devices.
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申请公布号 |
US5101490(A) |
申请公布日期 |
1992.03.31 |
申请号 |
US19890295318 |
申请日期 |
1989.01.10 |
申请人 |
BULL HN INFORMATION SYSTEMS INC. |
发明人 |
GETSON, JR., EDWARD F.;BRADLEY, JOHN W.;GARDNER, JOSEPH P.;VOTOLATO, ALFRED F. |
分类号 |
G06F3/06;G06F9/24;G06F9/445;G06F15/177 |
主分类号 |
G06F3/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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