Browse Prior Art Database

S-register Retention Method at Suspend Resume Operation for Internal Modems

IP.com Disclosure Number: IPCOM000109872D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Aruga, N: AUTHOR

Abstract

Disclosed is a circuit for retaining parameters such as an S-register for internal modems in a suspend condition. This method can minimize power consumption for a internal modem. There is no need for a DTE (Data Terminal Equipment) to retain MODEM parameters into memory in the DTE.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

S-register Retention Method at Suspend Resume Operation for Internal Modems

       Disclosed is a circuit for retaining parameters such as
an S-register for internal modems in a suspend condition.  This
method can minimize power consumption for a internal modem.  There is
no need for a DTE (Data Terminal Equipment) to retain MODEM
parameters into memory in the DTE.

      The figure shows this circuit.  When the system enters into
suspend mode, the DTE such as a PC (personal computer) makes the
"Wake-up" signal inactive.  Then the internal MODEM controller stores
its modem parameters in a CMOS static RAM (Random Access Memory).
After that, the modem controller sets switch-1 off through the signal
(a).  In this way the parameters of the internal modem are retained
in suspend condition with the minimum power consumption.

      When there is an incoming call or when the DTE starts to
operate, the switch-1 is set on through an R-S Latch or Flip-Flop.
Then the modem controller restores the previous parameters.  In this
way, resume operation starts properly, because the parameters revive
with the same values as prior to entering the suspend mode.