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Streaming Data Slave Control Directly From the Micro Channel Bus

IP.com Disclosure Number: IPCOM000099635D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Arimilli, R: AUTHOR [+3]

Abstract

Streaming Data protocol is a high-speed mechanism of data transfer on the MICRO CHANNEL*. To minimize critical timing paths the Bus Master that uses the Streaming data protocol is directly allowed to write in to arrays of the Slave. The signals CMD, BE(0..3), Address and Data lines control the access to the arrays. The Address and the BE(0..3) are latched using the signal ADL and then used to control the array address and the write enables. The array writes are timed using CMD as the array write clock. MICRO CHANNEL timings are maintained due to on-chip tracking.

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Streaming Data Slave Control Directly From the Micro Channel Bus

       Streaming Data protocol is a high-speed mechanism of data
transfer on the MICRO CHANNEL*.  To minimize critical timing paths
the Bus Master that uses the Streaming data protocol is directly
allowed to write in to arrays of the Slave.  The signals CMD,
BE(0..3), Address and Data lines control the access to the arrays.
The Address and the BE(0..3) are latched using the signal ADL and
then used to control the array address and the write enables.  The
array writes are timed using CMD as the array write clock.  MICRO
CHANNEL timings are maintained due to on-chip tracking.

      During boundary conditions the MICRO CHANNEL cycle is extended
by deactivating CHRDY signal until the condition has been serviced.
By allowing direct control to the Bus Master and adding wait states
at the boundary conditions, the Streaming Data function is
implemented with relaxed timings and lower logic complexity.  The
figure shows this implementation.
*  Trademark of IBM Corp.