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Bi-Directional Input/Output with Controlled Receiver

IP.com Disclosure Number: IPCOM000119157D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Kimura, T: AUTHOR [+3]

Abstract

Disclosed is a Bi-Directional Input/Output (I/O) (BIDI I/O) with a controlled receiver which is designed to reduce power consumption by disabling the unnecessary receiver part during data output. Also, this I/O complies with the requirements for input and output pins of an ordinary BIDI I/O book. Therefore, this I/O can be easily applied to an existing design.

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Bi-Directional Input/Output with Controlled Receiver

      Disclosed is a Bi-Directional Input/Output (I/O) (BIDI I/O)
with a controlled receiver which is designed to reduce power
consumption by disabling the unnecessary receiver part during data
output.  Also, this I/O complies with the requirements for input and
output pins of an  ordinary BIDI I/O book.  Therefore, this I/O can
be easily applied to an  existing design.

      The BIDI I/O, shown in Fig. 1, disables the receiver part which
is controlled by the receiver disable (RcvDisable) signal during
standby mode.  This I/O needs an additional RcvDisable pin and
control circuit  for this signal.  During data output, power
consumption can be reduced by  disabling the unnecessary receiver
part of BIDI I/O.  The output enable  (OutEnable) signal which
controls the direction of data is already available inside the BIDI
I/O.  The inverted signal of the OutEnable can be used to disable the
receiver part during data output.  Then, RcvDisable pin is not
required any more, and this I/O becomes compatible  with the existing
BIDI I/O book pin requirement (Out Data, RcvData, OutEnable and PAD).

      Fig. 2 shows the receiver part with the input disable function.
By using the existing OutEnable as RcvDisable, the receiver part can
be disabled during data output.  Then, (1) reduce charge current for
initial gate capacitance.  Next, (2) stop switching of internal
circuit.  Finally, (3) stop the signal tr...