Browse Prior Art Database

Micro Channel Signal Drivers Isolation in Personal Computers

IP.com Disclosure Number: IPCOM000112885D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Farrell, JK: AUTHOR [+6]

Abstract

Described is an architectural implementation to provide isolation of Micro Channel* (MC) signal drivers from the local bus drivers, in Personal Computers (PCs), by means of process compensating resistors for decoupling purposes.

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Micro Channel Signal Drivers Isolation in Personal Computers

      Described is an architectural implementation to provide
isolation of Micro Channel* (MC) signal drivers from the local bus
drivers, in Personal Computers (PCs), by means of process
compensating resistors for decoupling purposes.

      Generally, MC interface chips that drive the MC signals
directly do not have slew-rate or timing independence from the
drivers on the local bus.  Chips which use a process compensation
resistor to control driver slew rate cannot independently optimize
the performance of the drivers on the MC and the local bus.  The
concept described herein for provides a means of decoupling the MC
drivers from the local bus.  A two-fold approach is used in
decoupling the MC signal drivers from the local bus signal drivers,
as follows:

o   Provide separate operating frequencies for the MC and local bus
    partitions.

o   Provide separate process compensation resistors for the MC signal
    drivers and local bus signal drivers.

      By using separate compensating resistors along with the signal
operating frequencies, the MC signal drivers are decoupled from the
local bus drivers.  Decoupling the two banks of drivers provide the
following advantages:

o   The MC drivers can be adjusted to improve the signal quality of
    the local bus signals without affecting the quality of the MC
    signals.

o   The local bus drivers can be adjusted to improve the signal
...