Patent ID: 7000163
Filing Date: 2006-02-14
Classification: G01R

Abstract:
1. An apparatus comprising: one or more groups of boundary scan cells; one or more group buffers coupled to each of said groups of boundary scan cells; one or more repeater buffers coupled in series with said group buffers; a controller coupled to said groups of boundary scan cells through said group buffers and said repeater buffers, wherein (i) said apparatus is configured to buffer said groups of boundary scan cells to reflect an order of I/Os around said apparatus and (ii) said groups of boundary scan cells are routed within an I/O portion of said apparatus to avoid routing through an interior portion of said apparatus to keep said interior portion free for functional routing; one or more flip flops each configured to provide a scan enable output; and a scan enable signal configured to control a scan connection between each of said flip flops.