'it-618T 'lw 618-3
USOO5661409A
Umted States Patent [191
[11] Patent Number:
Mohsen
[45] Date of Patent:
[54] FIELD PROGRAMMABLE PRINTED CIRCUIT BOARD 5
[7 1
In
t 2
Am M_ M hse , S
van or
r
0
n
t
5,661,409 Aug. 26, 1997
OTHER PUBLICATIONS Lauther, “A Min—Cut Placement Algorithm for General Cell
, Cab-i
Assemblies Based on a Graph Representation,” 16th Design
am oga
Automation Conf., Jun. 25-27, 1979, pp. 1—10, reprinted in
[73] Assignee; Ap?x Corporation, San Jose, Calif.
Comp. Paps. Design Automation Conjl, 1988, pp. 182-191. Fiduccia et al, “A Linear-Time Heuristic for vImproving
_
Network Partitions,” 19th CM/IEEE Design Automation
[21] APP1'N°"52°’326 [22] Filed: Aug. 28, 1995
Conf., Jun. 14-16, 1932, pp. 175-131 reprinted in Camp. Paps. Design Automation Conf., pp. 241-247.
Related US. Application Data _
‘
(List continued on next page‘)
.
Primary Examiner-Ernest F. Karlsen
[60] Conunuation of Ser. No. 863,460, Apr. 3, 1992, abandoned,
Attorney, Age"); 0,. pirm_skjm-Ven~ Mom-11’ Macpherson,
which is a division of Ser. No. 410,194, Sep. 20, 1989, Pat.
-
No. 5,377,124‘ [51]
[52]
Int. Cl.6 ................................................... .. G01R 31/28
Cl. ........... ..
[57]
324/765; 324/158.1; 324/763
of Search .............................. .-
-
_
-
Franklin & Fnel LLP, Ronald J. Meet1n ABSTRACT
A ?dd programmable printed circuit board is provided
158-1, 73.1,
includes a
324/537’ 765’ 763; 371/13» 22-5, 29-1
of component contacts for
making electn'cal contact to the leads of electronic compo- 1 nents to be mounted on the piinted circuit board, a corre
[56]
Refemnces cued
spending multiplicity of interconnect contacts for receipt of
Us PATENT DOCUMENTS
the leads on the package or packages of a programmable
integrated circuit-or circuits for interconnecting as desired 3,849,872
11/ 1974 Hllb?ih?' ........................... .. 324/
the electronic colnponents, and one 01' more layers of
4,124,899 4,146,902
11/1978 Birlmer et a1. . , 3/1979 Tammoto et al. .
conductive traces formed on the printed circuit board, each
conductive trace uniquely connecting electrically one com
2:123:33? 1151338 E21‘;if.if;..11:11:11111111111111111111111. 33721533‘;
Pomt Contact to
(List continued on next page.) 609-1
12 Claims, 21 Drawing Sheets CELLS
606-1,1 609-2
interconnect Contact
609.4
609-K \\
KC
\
\
D
618-1
‘it-618T 'lw 618-3 1
|
151 /-L/
I0L
-
Umted States Patent [191
[11] Patent Number:
Mohsen
[45] Date of Patent:
[54] FIELD PROGRAMMABLE PRINTED CIRCUIT BOARD 5
[7 1
In
t 2
Am M_ M hse , S
van or
r
0
n
t
5,661,409 Aug. 26, 1997
OTHER PUBLICATIONS Lauther, “A Min—Cut Placement Algorithm for General Cell
, Cab-i
Assemblies Based on a Graph Representation,” 16th Design
am oga
Automation Conf., Jun. 25-27, 1979, pp. 1—10, reprinted in
[73] Assignee; Ap?x Corporation, San Jose, Calif.
Comp. Paps. Design Automation Conjl, 1988, pp. 182-191. Fiduccia et al, “A Linear-Time Heuristic for vImproving
_
Network Partitions,” 19th CM/IEEE Design Automation
[21] APP1'N°"52°’326 [22] Filed: Aug. 28, 1995
Conf., Jun. 14-16, 1932, pp. 175-131 reprinted in Camp. Paps. Design Automation Conf., pp. 241-247.
Related US. Application Data _
‘
(List continued on next page‘)
.
Primary Examiner-Ernest F. Karlsen
[60] Conunuation of Ser. No. 863,460, Apr. 3, 1992, abandoned,
Attorney, Age"); 0,. pirm_skjm-Ven~ Mom-11’ Macpherson,
which is a division of Ser. No. 410,194, Sep. 20, 1989, Pat.
-
No. 5,377,124‘ [51]
[52]
Int. Cl.6 ................................................... .. G01R 31/28
Cl. ........... ..
[57]
324/765; 324/158.1; 324/763
of Search .............................. .-
-
_
-
Franklin & Fnel LLP, Ronald J. Meet1n ABSTRACT
A ?dd programmable printed circuit board is provided
158-1, 73.1,
includes a
324/537’ 765’ 763; 371/13» 22-5, 29-1
of component contacts for
making electn'cal contact to the leads of electronic compo- 1 nents to be mounted on the piinted circuit board, a corre
[56]
Refemnces cued
spending multiplicity of interconnect contacts for receipt of
Us PATENT DOCUMENTS
the leads on the package or packages of a programmable
integrated circuit-or circuits for interconnecting as desired 3,849,872
11/ 1974 Hllb?ih?' ........................... .. 324/
the electronic colnponents, and one 01' more layers of
4,124,899 4,146,902
11/1978 Birlmer et a1. . , 3/1979 Tammoto et al. .
conductive traces formed on the printed circuit board, each
conductive trace uniquely connecting electrically one com
2:123:33? 1151338 E21‘;if.if;..11:11:11111111111111111111111. 33721533‘;
Pomt Contact to
(List continued on next page.) 609-1
12 Claims, 21 Drawing Sheets CELLS
606-1,1 609-2
interconnect Contact
609.4
609-K \\
KC
\
\
D
618-1
‘it-618T 'lw 618-3 1
|
151 /-L/
I0L
-
