XC5VLX50T-2FFG665I Xilinx Inc, XC5VLX50T-2FFG665I Datasheet - Page 49

• Manufacturer Part Number: XC5VLX50T-2FFG665I
• Description: IC FPGA VIRTEX-5 50K 665FCBGA
• Manufacturer: Xilinx Inc
• Series: Virtex™-5 LXTr

Specifications of XC5VLX50T-2FFG665I

• Number Of Logic Elements/cells: 46080
• Number Of Labs/clbs: 3600
• Total Ram Bits: 2211840
• Number Of I /o: 360
• Voltage - Supply: 0.95 V ~ 1.05 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 665-BBGA, FCBGA
• For Use With: HW-V5-ML561-UNI-G - EVALUATION PLATFORM VIRTEX-5HW-V5-ML550-UNI-G - EVALUATION PLATFORM VIRTEX-5HW-V5-ML521-UNI-G - EVALUATION PLATFORM VIRTEX-5HW-V5GBE-DK-UNI-G - KIT DEV V5 LXT GIGABIT ETHERNET122-1508 - EVALUATION PLATFORM VIRTEX-5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -

Virtex-5 FPGA User Guide
UG190 (v5.3) May 17, 2010
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Frequency Synthesis
Separate outputs provide a doubled frequency (CLK2X and CLK2X180). Another
output, CLKDV, provides a frequency that is a specified fraction of the input
frequency.
Two other outputs, CLKFX and CLKFX180, provide an output frequency derived from
the input clock by simultaneous frequency division and multiplication. The user can
specify any integer multiplier (M) and divisor (D) within the range specified in the
DCM Timing Parameters section of the Virtex-5 FPGA Data Sheet. An internal
calculator determines the appropriate tap selection, to make the output edge coincide
with the input clock whenever mathematically possible. For example, M = 9 and D = 5,
multiply the frequency by 1.8, and the output rising edge is coincident with the input
rising edge after every fifth input period, or after every ninth output period.
Phase Shifting
The DCM allows coarse and fine-grained phase shifting. The coarse phase shifting
uses the 90°, 180°, and 270° phases of CLK0 to make CLK90, CLK180, and CLK270
clock outputs. The 180° phase of CLK2X and CLKFX provide the respective CLK2X180
and CLKFX180 clock outputs.
There are also four modes of fine-grained phase-shifting; fixed, variable-positive,
variable-center, and direct modes. Fine-grained phase shifting allows all DCM output
clocks to be phase-shifted with respect to CLKIN while maintaining the relationship
between the coarse phase outputs. With fixed mode, a fixed fraction of phase shift can
be defined during configuration and in multiples of the clock period divided by 256.
Using the variable-positive and variable-center modes the phase can be dynamically
and repetitively moved forward and backwards by 1/256 of the clock period. With the
direct mode the phase can be dynamically and repetitively moved forward and
backwards by the value of one DCM_TAP. See the DCM Timing Parameters section in
the Virtex-5 FPGA Data Sheet.
Dynamic Reconfiguration
There is a bus connection to the DCM to change DCM attributes without reconfiguring
the rest of the device. For more information, see the Dynamic Reconfiguration chapter
of the Virtex-5 FPGA Configuration Guide.
The DADDR[6:0], DI[15:0], DWE, DEN, DCLK inputs and DO[15:0], and DRDY
outputs are available to dynamically reconfigure select DCM functions. With dynamic
reconfiguration, DCM attributes can be changed to select a multiply (M) or divide (D)
from the currently configured settings.
www.xilinx.com
DCM Summary
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