Browse Prior Art Database

Reading Rate Control

IP.com Disclosure Number: IPCOM000093667D
Original Publication Date: 1966-Jan-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Ridings, CL: AUTHOR

Abstract

Data is processed continuously by a typical receiver such as transmitting serializer 10. This has a characteristic cycle time slower than a typical source such as tape reader 11. The source and receiver are interfaced with buffer 12. The operation of source reader 11 is cyclically interrupted only as required to prevent loss of data.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 80% of the total text.

Page 1 of 2

Reading Rate Control

Data is processed continuously by a typical receiver such as transmitting serializer 10. This has a characteristic cycle time slower than a typical source such as tape reader 11. The source and receiver are interfaced with buffer 12. The operation of source reader 11 is cyclically interrupted only as required to prevent loss of data.

The timing chart shows that for several cycles buffer 12 can store data from the time it is generated, i.e., reader strobe time until the time it is to be used, i.e., call time. After a number of cycles, however, reader 11 produces data before the previous data is cleared from buffer 12. If this situation is allowed to occur, data is lost. Instead, various cycle times are considered and the point of buffer overrun is anticipated.

The point of overrunning is anticipated by comparing relative cycle times of reader 11 and serializer 10. Conveniently, the reader 11 strobe time can be compared, in the example shown, with the time during which serializer 10 is processing the second bit. A coincidence of these times indicates, by design, that a further cycle of reader 11 would cause overrun of buffer 12.

Accordingly, this coincidence is employed in And 13 to reset reader control flip-flop 14. The next call time of serializer 10 indicates emptying of buffer 12 and thus is conveniently employed to set flip-flop 14 to initiate further operation of reader 11. The timing chart shows continuous operation of serializer 10 and ...