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Method of Monitoring Serial Data Being Transferred Across the Enhanced Small Device Interface

IP.com Disclosure Number: IPCOM000057489D
Original Publication Date: 1988-May-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Carpenter, B [+details]

Abstract

When testing hard files and hard file controller adapters with the system shown in Fig. 1, a problem arises that involves trying to monitor all the serial data being transferred across the interface. This problem is more difficult across the ESDI (enhanced small device interface) because data is transferred at such high speed (10 million bits per second). To examine what is going on across the interface, a timing analyzer was used and 17 single pulses were examined to determine commands and status. After the value of the 17 bits was determined, they would have to be translated into the actual command or status. For example, the command 00000000001110110 would be translated to SEEK to cylinder 59. With the new method employing the ESDI monitor card shown in Fig.