XC5VSX50T-2FF665C Xilinx Inc, XC5VSX50T-2FF665C Datasheet - Page 25

• Manufacturer Part Number: XC5VSX50T-2FF665C
• Description: IC FPGA VIRTEX-5 50K 665FCBGA
• Manufacturer: Xilinx Inc
• Series: Virtex™-5 SXTr

Specifications of XC5VSX50T-2FF665C

• Number Of Logic Elements/cells: 52224
• Number Of Labs/clbs: 4080
• Total Ram Bits: 4866048
• Number Of I /o: 360
• Voltage - Supply: 0.95 V ~ 1.05 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 665-BBGA, FCBGA
• For Use With: HW-V5-ML506-UNI-G - EVALUATION PLATFORM VIRTEX-5
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Number Of Gates: -

Clock Resources
Global and Regional Clocks
Virtex-5 FPGA User Guide
UG190 (v5.3) May 17, 2010
Global Clocks
Regional Clocks and I/O Clocks
For clocking purposes, each Virtex®-5 device is divided into regions. The number of
regions varies with device size, eight regions in the smallest device to 24 regions in the
largest one. Global I/O and regional clocking resources manage complex and simple
clocking requirements. Non-clock resources, such as local routing, are not recommended
when performing clock functions.
Each Virtex-5 device has 32 global clock lines that can clock all sequential resources on the
whole device (CLB, block RAM, CMTs, and I/O), and also drive logic signals. Any ten of
these 32 global clock lines can be used in any region. Global clock lines are only driven by
a global clock buffer, which can also be used as a clock enable circuit, or a glitch-free
multiplexer. It can select between two clock sources, and can also switch away from a
failed clock source.
A global clock buffer is often driven by a Clock Management Tile (CMT) to eliminate the
clock distribution delay, or to adjust its delay relative to another clock. There are more
global clocks than CMTs, but a CMT often drives more than one global clock.
Each region has two regional clock buffers and four regional clock trees. A Virtex-5 I/O
bank spans exactly one region with the exception of some banks in the center column. Each
bank with the size identical to a region contains four clock-capable clock inputs. Each of
these inputs can differentially or single-endedly drive four I/O clocks and two regional
clocks in the same bank or region. In addition, regional clocks can drive regional clock trees
in the adjacent regions. When the clock-capable I/Os are driven by single-ended clocks,
then the clock must be connected to the positive (P) side of the differential “clock capable”
pin pair. The negative (N) side can be used as a general purpose I/O or left unconnected.
The regional clock buffer can be programmed to divide the incoming clock rate by any
integer number from 1 to 8. This feature, in conjunction with the programmable
serializer/deserializer in the IOB, (see
allows source-synchronous systems to cross clock domains without using additional logic
resources.
A third type of clocking resource, I/O clocks, are very fast and serve localized I/O
serializer/deserializer circuits. See
www.xilinx.com
Chapter 8, Advanced SelectIO Logic
Chapter 8, Advanced SelectIO Logic
Chapter 1
Resources.
Resources),
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