XC4VFX40-10FFG1152C Xilinx Inc, XC4VFX40-10FFG1152C Datasheet - Page 239

• Manufacturer Part Number: XC4VFX40-10FFG1152C
• Description: IC FPGA VIRTEX-4 FX 40K 1152FBGA
• Manufacturer: Xilinx Inc
• Series: Virtex™-4r

Specifications of XC4VFX40-10FFG1152C

• Number Of Logic Elements/cells: 41904
• Number Of Labs/clbs: 4656
• Total Ram Bits: 2654208
• Number Of I /o: 448
• Voltage - Supply: 1.14 V ~ 1.26 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 1152-BBGA, FCBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -

Virtex-4 FPGA User Guide
UG070 (v2.6) December 1, 2008
R
Input Termination to V
Some I/O standards (e.g., HSTL Class I and II) require an input termination voltage of
V
This is equivalent to having a split termination composed of two resistors. One terminates
to V
V
resistors, i.e., the resistors to V
Both HSTL and SSTL standards need 50Ω external reference resistors. The DCI I/O
standards supporting split termination are: HSTL_I_DCI, HSTL_I_DCI_18, HSTL_II_DCI,
HSTL_II_DCI_18, DIFF_HSTL_II_DCI, DIFF_HSTL_II_DCI_18, SSTL2_I_DCI,
SSTL2_II_DCI, SSTL18_I_DCI, SSTL18_II_DCI, DIFF_SSTL2_II_DCI, and
DIFF_SSTL18_II_DCI.
Figure 6-9
CCO
CCO
CCO
/2 (see
/2 using split termination. The termination resistance is set by the external reference
Figure 6-9: Input Termination to V
, the other to ground. The resistor values are 2R. DCI provides termination to
illustrates split termination inside a Virtex-4 device.
Figure
Figure 6-8: Input Termination to V
6-8).
CCO
www.xilinx.com
/2 (Split Termination)
Z
0
Z
CCO
0
SelectIO Technology Resources General Guidelines
V
and ground are each twice the reference resistor value.
CCO
Virtex-4 FPGA DCI
IOB
R
V
/2
CCO
Virtex-4 FPGA
IOB
2R
2R
V
CCO
REF
V
/2 Using DCI Split Termination
REF
CCO
UG070_6_09_030708
UG070_6_08_030708
/2 without DCI
239