XC4VFX12-11FFG668C Xilinx Inc, XC4VFX12-11FFG668C Datasheet - Page 248

• Manufacturer Part Number: XC4VFX12-11FFG668C
• Description: IC FPGA VIRTEX-4 FX 12K 668FCBGA
• Manufacturer: Xilinx Inc
• Series: Virtex™-4r

Specifications of XC4VFX12-11FFG668C

• Number Of Logic Elements/cells: 12312
• Number Of Labs/clbs: 1368
• Total Ram Bits: 663552
• Number Of I /o: 320
• Voltage - Supply: 1.14 V ~ 1.26 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 668-BBGA, FCBGA
• For Use With: HW-V4-ML403-UNI-G - EVALUATION PLATFORM VIRTEX-4HW-AFX-FF668-400 - BOARD DEV VIRTEX 4 FF668
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -

Chapter 6: SelectIO Resources
248
IOBUF
IBUFDS and IBUFGDS
OBUFDS
The IOBUF primitive is needed when bidirectional signals require both an input buffer and
a 3-state output buffer with an active High 3-state pin.
FPGA IOBUF.
The usage and rules corresponding to the differential primitives are similar to the single-
ended SelectIO primitives. Differential SelectIO primitives have two pins to and from the
device pads to show the P and N channel pins in a differential pair. N channel pins have a
“B” suffix.
Figure 6-21
Figure 6-22
Figure 6-21: Differential Input Buffer Primitive (IBUFDS/IBUFGDS)
shows the differential input buffer primitive.
shows the differential output buffer primitive.
Figure 6-22: Differential Output Buffer Primitive (OBUFDS)
Figure 6-20: Input/Output Buffer (IOBUF) Primitive
3-state input
from FPGA
O (Output)
to FPGA
I (Input)
www.xilinx.com
Input from
Device Pads
Inputs from
T
FPGA
IB
I
I
IOBUF
IBUFDS/IBUFGDS
+
–
+
–
OBUFDS
OB
UG070_6_21_031108
O
O
UG070_6_22_031108
Figure 6-20
Output to
FPGA
Output to
Device Pads
I/O
to/from Device Pad
UG070_6_20_031108
UG070 (v2.6) December 1, 2008
Virtex-4 FPGA User Guide
shows a generic Virtex-4
R