资料下载
×
介绍XC3000 XC3100中的多路复用器和桶型移位器
消耗积分:3 |
格式:rar |
大小:333 |
2009-05-15
敷衍作笑谈
分享资料个
With the possible exceptions of speed, deterministic timing, and low power, few things are as
important to programmable logic designers as reconfigurability and available I/O. In-System
Programming (ISP) has provided a flexible means of reconfigurability, but this feature mandates
the availability of at least four pins to accommodate ISP and Boundary Scan operations. Some
ISP devices provide dual configurations of the JTAG pins, where the ISP pins may be
configured as general purpose I/O if not required for ISP or Boundary Scan. In most cases,
however, the designation of JTAG pins as I/O precludes this device from future ISP operations
unless the part is bulk erased using a VPP mode of erasure. Historically, the use of ISP
techniques exacerbated the issue of insufficient device I/O, especially for smaller devices with
low I/O counts.
important to programmable logic designers as reconfigurability and available I/O. In-System
Programming (ISP) has provided a flexible means of reconfigurability, but this feature mandates
the availability of at least four pins to accommodate ISP and Boundary Scan operations. Some
ISP devices provide dual configurations of the JTAG pins, where the ISP pins may be
configured as general purpose I/O if not required for ISP or Boundary Scan. In most cases,
however, the designation of JTAG pins as I/O precludes this device from future ISP operations
unless the part is bulk erased using a VPP mode of erasure. Historically, the use of ISP
techniques exacerbated the issue of insufficient device I/O, especially for smaller devices with
low I/O counts.
声明：本文内容及配图由入驻作者撰写或者入驻合作网站授权转载。文章观点仅代表作者本人，不代表电子发烧友网立场。文章及其配图仅供工程师学习之用，如有内容侵权或者其他违规问题，请联系本站处理。 举报投诉
评论(0)
发评论
- 相关下载
- 相关文章
