公开(公告)号：JP2000056946A

公开(公告)日：2000-02-25

申请号：JP12688799

申请日：1999-05-07

Applicant: ST MICROELECTRONICS SRL

Inventor： SAVO PIERANDREA ,  ZANGRANDI LUIGI ,  MARCHESES STEFANO

IPC: G06F7/505 ,  G06F7/00 ,  G06F7/50 ,  G06F7/509

Abstract: PROBLEM TO BE SOLVED: To provide a digital accumulator operatable at a high speed in a wide dynamic range. SOLUTION: A digital accumulator 10 contains a first adder stage 15 where an input addend is added to the least significant value of the output of the accumulator at a previous clock cycle. The accumulator contains at least one second stage and it has an incremental/decremental unit means 18 for executing an incremental, decremental or identification operation on the most significant output of the accumulator. The incremental/decremental unit means contains a logic means for triggering the incremental, decremental or identification operation on the most significant output of the accumulator based on decision by a result obtained at the previous clock cycle.

公开(公告)号：DE69825558D1

公开(公告)日：2004-09-16

申请号：DE69825558

申请日：1998-03-31

Applicant: ST MICROELECTRONICS SRL

Inventor： PORTALURI SALVATORE ,  PISATI VALERIO ,  ZANGRANDI LUIGI

IPC: H03K7/08

Abstract: A device for generating pulses of high-precision programmable duration, whose particularity is the fact that it comprises: -- first pulse generator means (1) which are suitable to receive in input a pulse generation command signal (IN) and to emit in output a first pulse for loading the contents of a register in counter means (2); -- second pulse generator means (4), triggered by the first pulse in output from the first pulse generator means (1); -- third pulse generator means (6), triggered by a second pulse emitted by the second pulse generator means and suitable to generate a third pulse to restart the second pulse generator means; the second pulse emitted by the second pulse generator means (4) constituting a clock signal for the counter means (2) in order to produce a decrement in the counter means; the signal in output from the counter means (2) being the pulsed signal to be generated (OUT); the duration of the pulsed signal being determined by the content of the counter means (2).

公开(公告)号：DE69817153D1

公开(公告)日：2003-09-18

申请号：DE69817153

申请日：1998-05-08

Applicant: ST MICROELECTRONICS SRL

Inventor： SAVO PIERANDREA ,  ZANGRANDI LUIGI ,  MARCHESE STEFANO

IPC: G06F7/505 ,  G06F7/00 ,  G06F7/50 ,  G06F7/509