Xilinx M401 User Manual - Www.Bdtic.Com/xilinx

ML401/ML402/ML403 Evaluation Platform

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15

UG080 (v2.5)  May 24, 2006

Detailed Description

R

Digitally Controlled Impedance (DCI)

Some FPGA banks can support the DCI feature in Virtex-4 FPGAs. Support for DCI is 

summarized in 

Table 2

.

Table 2:

DCI Capability of FPGA Bank

FPGA Bank

DCI Capability

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,  49.9

Ω

 resistors are installed.

9

a

a. Bank 9 and 10 are non-connected pins in the case of the ML403 board with XC4VFX12-FF668.

Yes, 49.9

Ω

 resistors are installed.

10

a

Not supported.

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