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Browse Prior Art Database

Method for Providing Two Power-On Setup Options for Adapter Cards

IP.com Disclosure Number: IPCOM000103902D
Original Publication Date: 1993-Feb-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Clark, GL: AUTHOR [+4]

Abstract

Disclosed is a programmable feature in an I/O controller circuit for providing a first option in which as many as five adapter cards can be set up during a power-on sequence, or a second option in which as many as sixteen cards can be set up.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 69% of the total text.

Method for Providing Two Power-On Setup Options for Adapter Cards

      Disclosed is a programmable feature in an I/O controller
circuit for providing a first option in which as many as five adapter
cards can be set up during a power-on sequence, or a second option in
which as many as sixteen cards can be set up.

      As shown in the figure, bits 0 through 4 in a port 96H register
10 are used to set up adapter cards by means of a setup circuit 12.
In register 10, bits 0, 1, 2, and 4, which are enabled by switching
from a 1 to a 0 level, are used to provide SET 0, SET 1, SET 2, and
SET 3 signals, respectively.  Bit 3, which is enabled by switching
from a 0 to a 1 level, is used to provide an ENBC signal, which
enables the card setup operation.  The output selected through
circuit 12, which is provided on outputs of selection circuits 14,
strobes negative for the duration of the unlatched address whenever
an address decode 100H through 107H is decoded, as indicated by the
ీ ULA 100-107 signal supplied as an input to circuit 12 on line
16.  The output of AND circuit 17 is used to provide the timing of
this strobe signal.

      The determination between these setup options is made in
accordance with the level of the 16 SLOTS signal brought as an
input to circuit 12 on line 18.  If this signal is high, the output
of each selection circuit 14 is set according to the inputs of an
associated NAND circuit 20, so that up to five adapter cards can be
set up direct...