Browse Prior Art Database

Parallel Hardware Initialization From a Single Service Processor

IP.com Disclosure Number: IPCOM000101116D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 3 page(s) / 89K

Publishing Venue

IBM

Related People

Burke, KC: AUTHOR [+2]

Abstract

Disclosed is a hardware access method which permits parallel initialization to multiple elements, where an element can be any entity (processor, chip, etc.) addressed from a central control point.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 58% of the total text.

Parallel Hardware Initialization From a Single Service Processor

       Disclosed is a hardware access method which permits
parallel initialization to multiple elements, where an element can be
any entity (processor, chip, etc.) addressed from a central control
point.

      Many mainframe designs use a service processor to reset and
test system hardware.  Commands from the service processor contain an
address which identifies an element to be accessed.  The command is
decoded at a central control point (CCP) and sent to one of the
elements.

      In this design, the CCP allows more than one element to be
accessed at a time.  New address decodes are used to indicate
multi-port driving.  Fig. 1 shows the CCP design to support a machine
with 10 elements.  As Fig. 1 indicates, when address bit 0 is off,
the remaining bits of the address register are filtered through AND
gates to activate the required element ports. An address of '50'x
drives Element 1.  An address of '70'x drives Elements 1 and 6.  An
address of '7F'x drives all ten elements.  The element 'drive'
signals are used to send data to the appropriate elements where the
data is decoded, and an acknowledgment sent back to the CCP
indicating the data was received.

      Since the data is now being sent out in parallel, the CCP is
designed to verify all addressed elements and respond with an
acknowledge.  Fig. 2 contains the section of the CCP design which is
used to consolidate each element...