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Digitally Controlled Impedance (DCI)
Some FPGA banks can support the DCI feature in Virtex-4 FPGAs. Support for DCI is
summarized in
Table 2: DCI Capability of FPGA Bank
a. Bank 9 and 10 are non-connected pins in the case of the ML403 board with XC4VFX12-FF668.
www.BDTIC.com/XILINX
ML401/ML402/ML403 Evaluation Platform
UG080 (v2.5) May 24, 2006
Table
2.
FPGA Bank
1
Not supported.
2
Not supported.
3
Optional: User must remove resistors R234 and R235 and must install
resistors R222 and R221.
Note:
Use of DCI will disable the use of GPIO LED [2] and [3].
4
Not supported.
5
Optional: User must install resistors R224 and R225 to use DCI. In bitgen,
the switch "-g DCIUpdateMode:Quiet" must also be used.
Note:
Use of DCI will disable user control of the DDR_CS_N and DDR_CKE
signals.
6
Not supported.
7
Optional: User must install resistors R289 and R290.
Note:
This will disable the use of two I/O pins on the expansion connector J5
(pin 38 and 40).
8
Yes, 49.9Ω resistors are installed.
a
9
Yes, 49.9Ω resistors are installed.
a
10
Not supported.
www.xilinx.com
Detailed Description
DCI Capability
15
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