Browse Prior Art Database

Prom Pulse Train Generator

IP.com Disclosure Number: IPCOM000112376D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Olsen, FW: AUTHOR

Abstract

Disclosed is a method for obtaining a programmable pulse train without any counters, or single shots with follow on logic. A Programmable Read Only Memory (PROM) provides all details after the proper programming has been done.

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This is the abbreviated version, containing approximately 100% of the total text.

Prom Pulse Train Generator

      Disclosed is a method for obtaining a programmable pulse train
without any counters, or single shots with follow on logic.  A
Programmable Read Only Memory (PROM) provides all details after the
proper programming has been done.

      This method involves programming a PROM with some of its
outputs connected back to other inputs of same, so that with an input
level change, several sequential address access steps take place.
This action creates pulses, that can be pre-programmed to suit.

      An example of this method is described for 1 to 8 sequential
pulses with pulse spacing equal to the pulse width, that is equal to
the address access time of the PROM used.

      A (512 x 8) PROM is connected up as shown with 4 of its outputs
fed back to inputs.  The PROM is programmed so that the access
(address) time serves as a clock, while the feed back data address
seeks new address as many times as it is programmed for.  Each
alternate address is at +, while others are at -.