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Browse Prior Art Database

Architected Pseudo Slots for Additional Planar Functions On Micro Channel Systems

IP.com Disclosure Number: IPCOM000120651D
Original Publication Date: 1991-May-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Kelley, RA: AUTHOR [+3]

Abstract

This article describes a mechanism which allows for additional planar functions to be added to personal computer Micro Channel* systems and for set up, utilities and diagnostics to treat these functions as I/O adapters in pseudo I/O slots.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 79% of the total text.

Architected Pseudo Slots for Additional Planar Functions On Micro
Channel Systems

      This article describes a mechanism which allows for
additional planar functions to be added to personal computer Micro
Channel* systems and for set up, utilities and diagnostics to treat
these functions as I/O adapters in pseudo I/O slots.

      In some Micro Channel system units ports 94H and 96H are used
to put the plannar board functions and I/O slots in set-up mode as
illustrated in Fig. 1.  Accessing the programmable option select
(POS) registers for the second serial port on these 4-slot Micro
Channel systems by putting pseudo slot 6 in set-up mode can cause
future problems, such as what happens when it is desired to put this
second port on an 8-slot system.  An architected solution that
eliminates this problem is described herein.  This solution allows
for future additional planar functions to be added to Micro Channel
systems.

      Eight pseudo slots can be allowed in the Micro Channel
architecture, and these pseudo slots can be placed in set-up mode in
a similar fashion as is currently done for the I/O slots through port
96H, except that the enable/set-up bit would be inverted (for
compatibility with the current use of PORT 94H).  The new definition
for PORT 94H is illustrated in Fig. 2.

      Each planar function that is accessed as a pseudo slot would
then implement all of the POS registers just like an I/O adapter
(i.e., each would have an unique adapt...