Browse Prior Art Database

Channel Interface

IP.com Disclosure Number: IPCOM000090612D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Kuhne, R: AUTHOR

Abstract

This interface provides the connection between Control Unit 1 and one or several I/O Units 2...n by a channel using an echo technique. The channel is a set of Station Address Out lines 4, Command Out lines 5, Component Address Out lines 6, Data Out lines 7, and Gate Out lines 8 to send in parallel addresses, commands, and data from Unit 1 to I/O Units 2...n. In order to select one station, Unit 1 sends the Station Address on lines 4. The station which recognizes its address sends it back to Unit 1 on Station Address In lines 9 for checking purposes in Unit 1.

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Channel Interface

This interface provides the connection between Control Unit 1 and one or several I/O Units 2...n by a channel using an echo technique. The channel is a set of Station Address Out lines 4, Command Out lines 5, Component Address Out lines 6, Data Out lines 7, and Gate Out lines 8 to send in parallel addresses, commands, and data from Unit 1 to I/O Units 2...n. In order to select one station, Unit 1 sends the Station Address on lines 4. The station which recognizes its address sends it back to Unit 1 on Station Address In lines 9 for checking purposes in Unit 1.

Lines 6 are used by Unit 1 to specify, for a selected station, the registers to be read, written or reset in the station. The selected station sends back the Component Address on the Component Address In lines 11 for checking. Lines 5 are used to specify the type of operation, Read, Write, Reset or Unlock Keyboard, which is to be executed on the selected register. The selected station sends back the Command Code to Unit 1 on Command In lines 10.

On a Write operation, the selected station sends back the data on Data In lines 12. On a Read operation, Unit 1 sends back on lines 8 the read data in order to enable the I/O unit to check it. Gate lines 8 and 13 indicate that levels, present on data lines, are available as data. These two lines, used as interlocked lines, enable a synchronous transmission on the channel.

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