| 摘要 |
<p>An improved routing system and method allow routing pluralities of signal to circuit blocks (50) on integrated circuit chips using minimal die area. The improved routing system employs a plurality of tri-state buffers (211, 221, 231), a plurality of conductive lines (214, 212, 270, 251, 226, 236) and a controller (260). The circuit block (50) can be driven from remote locations via the tri-state buffers (211, 221, 231) and conductive lines (214, 212, 270, 251, 226, 216, 236). The tri-state buffers (211, 221, 231) are selectively enabled one at a time by the controller to prevent signal contention. The multiplexors encountered in conventional routing systems are not needed. The improved routing system and method are ideal for routing to and from large circuit blocks which have numerous terminals, such as embedded dynamic random access memory units, embedded static random access memory units, central processing units, arithmetic logic units, register files and cores generally. The improved routing system and method also allow testing of large circuit blocks with test vectors supplied by built in self test units and or off-chip tested equipment.</p> |
