Xilinx Virtex-5 FPGA的DCI问题

在Xilinx Virtex-5 FPGA中Bank1和Bank2是没有专用的DCI控制VRN和VRP管脚，但是在用户手册上说是可以通过DCI级联来实现Bank1和Bank2的DCI
这种通过级联来实现Bank1和Bank2的DCI具体应该怎么做?

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    我也遇到同样的问题。手册中只说同列中相邻bank，可以使用DCI级联。看手册中关于同列、相邻bank的定义没说清楚。还有差分和单短的连接方式有没有区别也没说清楚。

1. DCI CASCADE is only supported in Virtex-5 (the newest Virtex family as of the creation of this Answer Record).
2. DCI CASCADE is enabled by putting the following constraint in the design constraint file (.ucf file).
a. Config DCI_CASCADE = "master_bank_number slave1_bank number slave2_bank_number ?";
3. DCI banks cascaded together must be in the same column.
4. DCI compatibility rules apply across all DCI CASCADED banks. For example:
a. Same VCCO on all cascaded banks if applicable.
b. Same VREF on all cascaded banks if applicable.
c. No more than one I/O standard using Split Termination across cascaded banks.
d. No more than one I/O standard using Single Termination across cascaded banks.
e. Please refer to Chapter 6 of the user guide for a completed understanding of all DCI related compatibility banking rules.
5. DCI banks cascaded together must be consecutive (no bank skipping is allowed).
6. Banks 1 & 2 can only be used as slave banks since there are no VRP & VRN pins available for these two banks.
7. DCI CASCADE cannot across bank 0 which is located in between band 1 & 2 in the center column.
8. DCI CASCADE cannot across Clock Management Tiles (CMT) which are located in between bank 3 & 4 and bank 4 & 6 in the center column for some Virtex-5 devices (NOTE: ISE 9.2i or older version may miss this hardware limitation).
9. There must be at least one DCI I/O (even a dummy one) instantiated in the master bank, and this DCI I/O must require the use of VRP and VRN reference resistors for DCI termination referencing.
10. NOTE: For a complete understanding on all DCI and DCI CASCADE related rules, please consult Chapter 6 of the latest Virtex-5 User Guide and the latest software constraint guide.
11. When running bitgen via a command line or script, it is required to include the .pcf file. The .PCF file is read into bitgen to include DCI_CASCADE attributes. This is the default attribute for bitgen, but the .pcf must be present.希望对大家有帮助

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