发明公开
EP0596658A1 Low-skew signal routing in a programmable array
失效
Leitweglenkung mit geringer在einem programmierbaren Feld的信号。
- 专利标题: Low-skew signal routing in a programmable array
- 专利标题(中): Leitweglenkung mit geringer在einem programmierbaren Feld的信号。
-
申请号: EP93308621.7申请日: 1993-10-28
-
公开(公告)号: EP0596658A1公开(公告)日: 1994-05-11
- 发明人: Britton, Barry Kevin , Hill, Dwight Douglas , Oswald, William Anthony
- 申请人: AT&T Corp.
- 申请人地址: 32 Avenue of the Americas New York, NY 10013-2412 US
- 专利权人: AT&T Corp.
- 当前专利权人: AT&T Corp.
- 当前专利权人地址: 32 Avenue of the Americas New York, NY 10013-2412 US
- 代理机构: Watts, Christopher Malcolm Kelway, Dr.
- 优先权: US971501 19921104
- 主分类号: H03K19/00
- IPC分类号: H03K19/00 ; H03K19/177
摘要:
Providing low-skew clock signals to a Field Programmable Gate Array (FPGA) chip normally requires devoting a certain number of bondpads to that purpose. However, that limits the number of clocks that may be applied, and may also limit which bondpads can be used for that purpose. In the present invention, any input/output bondpad (eg., 238 - 241; 246 - 249) may be used to supply a low-skew clock, or other global type signal, to one or more of the Programmable Function Units (PFUs) (eg., 205 - 213). This is accomplished by using a criss-crossed grid of parallel conductor groups (eg., 254, 255). Any of the conductors may be supplied by a clock from a bondpad or alternatively driven directly from a PFU, thereby allowing the distribution of internally-generated clocks. To facilitate programmable interconnects between the horizontal and vertical conductors, the outer conductor in a group crosses over the others at defined intervals, to thereby become the inner conductor. In this manner, each cell (eg., 201 - 204) may drive a subset of the conductors in a group, thereby reducing the number of drivers needed. This allows all the buffer and conductor topologies to be identical for each cell, which significantly aids in the computer-aided design of the FPGA, as well as simplifying its programming.
公开/授权文献
- EP0596658B1 Low-skew signal routing in a programmable array 公开/授权日:1998-02-25
信息查询