公开(公告)号：CA1121062A

公开(公告)日：1982-03-30

申请号：CA309826

申请日：1978-08-22

Applicant: XEROX CORP

Inventor： DAUGHTON JOHN W ,  GILLETT KENNETH ,  NELSON FRANK M

IPC: G03G21/14 ,  G05B19/042 ,  G06F13/00 ,  G06F9/22

Abstract: A data communications system having a programmable master controller including memory means and command byte generating means and a plurality of additional controllers providing input data bytes to the master controller and having means for receiving command bytes from the master controller. The additional controllers are each connected to the master controller such that corresponding data bits are ORed together and means are provided for the simultaneous transmission of data bytes from the additional controllers to the master controller such that corresponding bits of the simultaneously transmitted bytes have mutually exclusive data therein.

公开(公告)号：CA1109158A

公开(公告)日：1981-09-15

申请号：CA294574

申请日：1978-01-09

Applicant: XEROX CORP

Inventor： GILLETT KENNETH ,  CRISWELL THOMAS ,  RICHARDSON PHILIP ,  STEINER EDWARD L ,  FISKE KENTON W ,  DAVIS KENNETH A ,  KUKUCKA WILLIAM P

IPC: G06F12/16 ,  G03G21/00 ,  G03G21/14 ,  G06F1/28 ,  G06F11/16 ,  G06F13/28 ,  G06F13/00

Abstract: NON-VOLATILE STORAGE MODULE FOR A CONTROLLER A non-volatile storage module as utilized in a controller for directing a plurality of control registers of a host machine. The controller including a central processor that is communicatively coupled through a system bus having control data, and address lines to the module and host machine. The non-volatile storage module includes a data memory operative to interface with the system bus for storing data, and for input-output of the data therefrom through the system bus upon command of the central processor. In addition, the module further includes a power storage unit coupled to the data memory for distributing a plurality of power signals from the host machine through a plurality of critical and non-critical power lines to the data memory for providing a power source that may be utilized therein for a power down condition and for sensing a power down condition on the critical power line from the power storage unit for the switching thereof to the data memory. The module also includes an apparatus that is operative upon indication of a power down condition from the host machine for generating an enabling signal to the data memory while a current address signal on the system bus is being received by the data memory.

公开(公告)号：CA1100645A

公开(公告)日：1981-05-05

申请号：CA294599

申请日：1978-01-09

Applicant: XEROX CORP

Inventor： CRISWELL THOMAS ,  MAGER GEORGE E ,  NELSON FRANK M ,  GILLETT KENNETH ,  HOLT CHARLES P ,  STEINER EDWARD L ,  DAUGHTON JOHN W ,  FISKE KENTON W ,  HALL WARREN L

IPC: G03G21/14 ,  G05B19/05 ,  G06F13/12 ,  G06F13/28 ,  G06F9/16

Abstract: Direct Memory Access Refresh System In a controller for a host machine such as an electrostatographic copier having a central processing unit module connected via a system bus to an input-output processing unit module, a direct memory access system functioning as part of the input-output processing unit module and operative to provide a high-speed means of refreshing and updating control registers in the host machine by direct accessing of memory in the central processing unit module. The direct memory access system may be programmed to synchronously refresh-update the host machine's control registers as in its normal mode and also asynchronously refresh-update the control registers as in the abnormal mode of a detected electrical disturbance in the electro-sensitive periphery surrounding the control registers, thus requiring restoring thereof. High-speed movement of data by the direct memory access system is achieved through dedicating a portion of random access memory in the central processing unit module for such accessing, and transferring control of the system bus from the central processing unit module to the direct memory access system. This enables data accessed through a fixed sequence of addresses from dedicated memory to be transferred directly to the host machine's control registers without incurring time constants that would otherwise be had if the data were to be manipulated by a central processor in the central processing unit module

公开(公告)号：DE2833020A1

公开(公告)日：1979-03-15

申请号：DE2833020

申请日：1978-07-27

Applicant: XEROX CORP

Inventor： DONOHUE JAMES M ,  LING ANDREW T ,  HOLT CHARLES P ,  WILCZEK STEPHEN P ,  MALINICH RICHARD M ,  NELSON FRANK M ,  GILLETT KENNETH ,  DAUGHTON JOHN W

IPC: G03G21/00 ,  G03G15/00 ,  G03G15/041 ,  G03G15/22 ,  G03G21/14 ,  G05B15/02 ,  G05B19/042 ,  G05B19/05

公开(公告)号：DE2800855A1

公开(公告)日：1978-07-13

申请号：DE2800855

申请日：1978-01-10

Applicant: XEROX CORP

Inventor： CRISWELL THOMAS ,  MAGER GEORGE E ,  NELSON FRANK M ,  GILLETT KENNETH ,  HOLT CHARLES P ,  STEINER EDWARD L ,  DAUGHTON JOHN W ,  FISKE KENTON W ,  HALL WARREN L

IPC: G03G21/14 ,  G05B19/05 ,  G06F13/12 ,  G06F13/28 ,  G06F9/00 ,  G05B19/04 ,  G06F13/06 ,  G06F15/46

公开(公告)号：CA1116727A

公开(公告)日：1982-01-19

申请号：CA309794

申请日：1978-08-22

Applicant: XEROX CORP

Inventor： DONOHUE JAMES M ,  MALINICH RICHARD M ,  LING ANDREW T ,  NELSON FRANK M ,  HOLT CHARLES P ,  GILLETT KENNETH

IPC: G03G15/00 ,  G03G21/14 ,  G05B15/02

Abstract: An electrophotographic reproduction machine for use as a copier/duplicator having a master microprogrammed controller and a plurality of area controllers cooperatively operative to carry out a plurality of machine operation tasks. At least one of the area controllers contains a separate microprogrammed controller for controlling selected tasks and devices in the reproduction machine in synchronism with the operation of other tasks as controlled by the master controller. An optical communication link couples the master and area controllers and serves to isolate the master controller from transients and a direct I/O connection.

公开(公告)号：DE2800892A1

公开(公告)日：1978-09-21

申请号：DE2800892

申请日：1978-01-10

Applicant: XEROX CORP

Inventor： GILLETT KENNETH ,  CRISWELL THOMAS ,  RICHARDSON PHILIP ,  FISKE KENTON W ,  STEINER EDWARD L ,  DAVIS KENNETH A ,  KUKUCKA WILLIAM P

IPC: G06F12/16 ,  G03G21/00 ,  G03G21/14 ,  G06F1/28 ,  G06F11/16 ,  G06F13/28 ,  G06F13/06 ,  G06F15/46 ,  G06F9/00 ,  G05B19/04

Abstract: A non-volatile storage module as utilized in a controller for directing a plurality of control registers of a host machine. The controller includes a central processor that is communicatively coupled through a system bus having control data, and address lines to the module and host machine. The non-volatile storage module includes a data memory operative to interface with the system bus for storing data, and for input-output of the data therefrom through the system bus upon command of the central processor. In addition, the module further includes a power storage unit coupled to the data memory for distributing a plurality of power signals from the host machine through a plurality of critical and non-critical power lines to the data memory for providing a power source that may be utilized therein for a power down condition and for sensing a power down condition on the critical power line from the power storage unit for the switching thereof to the data memory. The module also includes an apparatus that is operative upon indication of a power down condition from the host machine for generating an enabling signal to the data memory while a current address signal on the system bus is being received by the data memory.