XC4VFX12-11FFG668C Xilinx Inc, XC4VFX12-11FFG668C Datasheet - Page 297
XC4VFX12-11FFG668C
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
-
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Virtex-4 FPGA User Guide
UG070 (v2.6) December 1, 2008
BLVDS (Bus LVDS)
CSE Differential LVPECL (Low-Voltage Positive Emitter-Coupled Logic)
R
LVPECL Transceiver Termination
Table 6-35: Allowed Attributes of the LDT I/O Standard
Since LVDS is intended for point-to-point applications, BLVDS is not an EIA/TIA standard
implementation and requires careful adaptation of I/O and PCB layout design rules. The
primitive supplied in the software library for bidirectional LVDS does not use the Virtex-4
FPGA LVDS current-mode driver. Therefore, source termination is required.
shows the BLVDS transmitter termination.
Table 6-36
Table 6-36: Available BLVDS Primitives
LVPECL is a very popular and powerful high-speed interface in many system applications.
Virtex-4 FPGA I/Os are designed to comply with the EIA/TIA electrical specifications for
2.5V LVPECL to make system and board design easier.
The Virtex-4 FPGA LVPECL transmitter and receiver requires the termination shown in
Figure
50Ω transmission lines. The LVPECL driver is composed of two LVCMOS drivers that
IOSTANDARD
CAPACITANCE
DIFF_TERM
IOSTANDARD
CAPACITANCE
BLVDS_25
BLVDS_25
Attributes
Attributes
6-77, illustrating a Virtex-4 FPGA LVPECL transmitter and receiver on a board with
summarizes all the possible BLVDS I/O standards and attributes supported.
IOB
Figure 6-76: BLVDS Transmitter Termination
Specific Guidelines for Virtex-4 FPGA I/O Supported Standards
IBUFDS/IBUFGDS
www.xilinx.com
LOW, NORMAL,
DONT_CARE
165Ω
165Ω
R
R
IBUFDS/IBUFGDS
S
S
LOW, NORMAL,
TRUE, FALSE
DONT CARE
R DIV
140Ω
Z 0 = 50Ω
Z 0 = 50Ω
R DIFF = 100Ω
OBUFDS/OBUFTDS
Primitives
Primitives
BLVDS_25
NORMAL
LDT_25
INX
IN
OBUFDS/OBUFTDS
NORMAL
Unused
IOB
LOW, NORMAL,
DONT_CARE
IOBUFDS
BLVDS_25
+
-
Figure 6-76
ug070_6_74_071904
Data in
297
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