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Title:
COUNTER CIRCUIT AND LAYOUT METHOD THEREOF
Document Type and Number:
Japanese Patent JP2008301325
Kind Code:
A
Abstract:

To prevent timing of output signals from being deviated in a synchronous type counter circuit by taking layout into account.

A counter circuit outputs count values Q0-Q15 of MN bits using M (e.g., four) pieces of N-bit (e.g., 4-bit) synchronous counters BLK1-BLK4 and comprises a coincidence detection circuit 30 which outputs a coincidence detection signal DET when the count value becomes a predetermined value of S0-S15. In such a counter circuit, the M pieces of N-bit synchronous counters BLK1-BLK4 are adjacently disposed in parallel and the coincidence detection circuit 30 is disposed adjacently to terminal portions of these N-bit synchronous counters BLK1-BLK4 disposed in parallel.


Inventors:
SEKIYA YUICHI
YAMADA TOSHIMI
Application Number:
JP2007146597A
Publication Date:
December 11, 2008
Filing Date:
June 01, 2007
Export Citation:
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Assignee:
OKI ELECTRIC IND CO LTD
OKI MICRO DESIGN CO LTD
International Classes:
H03K21/40; H03K23/40
Domestic Patent References:
JPH09289445A1997-11-04
JP2001336679A2001-12-07
JPH0472815A1992-03-06
Attorney, Agent or Firm:
Kakimoto Yasunari