Cycle stealing I/O controller with programmable offline mode of

Boots – shoes – and leggings

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

G06F 922, G06F 1300, G06F 1506, G06F 1520

Patent

active

044518846

ABSTRACT:
A dual mode microprocessor acts either as a front-end IO controller processor relative to a primary host processor and device or as a secondary data processor having independent storage, processing and IO capabilities. Host software prepares a list of device control block (DCB) arrays, which contain primary commands interpretable by the microprocessor so as to evoke these modes. Each DCB contains a chaining bit permitting its interpretation sequence to be chained (or not chained) to another DCB sequence, and a mode bit defining either a high speed DI/DO (HS) mode of operation or a programmable offline (PO) mode. In HS mode the microprocessor conditions associated adapters to transfer a specified amount of data between the host memory and device, performing this transfer in an autonomous manner, i.e., without assistance from either processor. In PO mode the microprocessor directs associated elements to perform one or more programs of operations defined by secondary commands contained in a command list which is transferred to the microprocessor's memory by special PO mode "LOAD" type DCB's, and interpreted in response to special PO mode type "START" DCB's. A list transferred by one LOAD DCB may be repeatedly accessed at various positions by several START DCB's. The architecture of the command list includes commands which permit the microprocessor to exchange data with the host and/or a device, perform arithmetic operations on data, perform bit and byte manipulative operations on data, and directly control the device interface.

REFERENCES:
patent: 3223976 (1965-12-01), Abbott et al.
patent: 3475729 (1969-10-01), Porcelli et al.
patent: 3587058 (1971-06-01), Butler et al.
patent: 3599176 (1971-08-01), Cordero, Jr. et al.
patent: 3623011 (1971-11-01), Baynard, Jr. et al.
patent: 3905023 (1975-09-01), Perpiglia
patent: 4023142 (1977-05-01), Woessner et al.
patent: 4038642 (1977-07-01), Boucknecht et al.
patent: 4053950 (1977-10-01), Bourke et al.
patent: 4100601 (1978-07-01), Kaufman et al.
patent: 4246637 (1981-01-01), Brown et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Cycle stealing I/O controller with programmable offline mode of does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cycle stealing I/O controller with programmable offline mode of , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cycle stealing I/O controller with programmable offline mode of will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1401140

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.