XC4VFX20-10FFG672C Xilinx Inc, XC4VFX20-10FFG672C Datasheet - Page 63

• Manufacturer Part Number: XC4VFX20-10FFG672C
• Description: IC FPGA VIRTEX-4 FX 20K 672-FBGA
• Manufacturer: Xilinx Inc
• Series: Virtex™-4r

Specifications of XC4VFX20-10FFG672C

• Total Ram Bits: 1253376
• Number Of Logic Elements/cells: 19224
• Number Of Labs/clbs: 2136
• 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: 672-BBGA, FCBGA
• No. Of Logic Blocks: 19224
• No. Of Macrocells: 19224
• No. Of Speed Grades: 10
• No. Of I/o's: 320
• Clock Management: DCM
• I/o Supply Voltage: 3.45V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: HW-V4-ML405-UNI-G - EVALUATION PLATFORM VIRTEX-4
• Number Of Gates: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Virtex-4 FPGA User Guide
UG070 (v2.6) December 1, 2008
Status and Data Output Ports
R
2x Output Clock, 180° Phase Shift — CLK2X180
Frequency Divide Output Clock — CLKDV
Frequency-Synthesis Output Clock — CLKFX
Frequency-Synthesis Output Clock, 180° — CLKFX180
Locked Output — LOCKED
Phase-Shift Done Output — PSDONE
The CLK2X180 output clock provides a clock with the same frequency as the DCM’s
CLK2X only phase-shifted by 180°.
The CLKDV output clock provides a clock that is phase aligned to CLK0 with a frequency
that is a fraction of the effective CLKIN frequency. The fraction is determined by the
CLKDV_DIVIDE attribute. Refer to the
The CLKFX output clock provides a clock with the following frequency definition:
In this equation, M is the multiplier (numerator) with a value defined by the
CLKFX_MULTIPLY attribute. D is the divisor (denominator) with a value defined by the
CLKFX_DIVIDE attribute. Specifications for M and D, as well as input and output
frequency ranges for the frequency synthesizer, are provided in the
The rising edge of CLKFX output is phase aligned to the rising edges of CLK0, CLK2X, and
CLKDV. When M and D to have no common factor, the alignment occurs only once every
D cycles of CLK0.
The CLKFX180 output clock provides a clock with the same frequency as the DCM’s
CLKFX only phase-shifted by 180°.
The LOCKED output indicates whether the DCM clock outputs are valid, i.e., the outputs
exhibit the proper frequency and phase. After a reset, the DCM samples several thousand
clock cycles to achieve lock. After the DCM achieves lock, the LOCKED signal is asserted
High. The DCM timing parameters section of the
locking times.
To guarantee an established system clock at the end of the start-up cycle, the DCM can
delay the completion of the device configuration process until after the DCM is locked. The
STARTUP_WAIT attribute activates this feature. The
description provides further information.
Until the LOCKED signal is asserted High, the DCM output clocks are not valid and can
exhibit glitches, spikes, or other spurious movement. In particular, the CLK2X output
appears as a 1x clock with a 25/75 duty cycle.
The phase-shift done (PSDONE) output signal is synchronous to PSCLK. At the
completion of the requested phase shift, PSDONE pulses High for one period of PSCLK.
This signal also indicates a new change to the phase shift can be initiated. The PSDONE
output signal is not valid if the phase-shift feature is not being used or is in fixed mode.
CLKFX frequency = (M/D) × effective CLKIN frequency
www.xilinx.com
CLKDV_DIVIDE Attribute
Virtex-4 Data Sheet
STARTUP_WAIT Attribute
for more information.
provides estimates for
Virtex-4 Data
DCM Ports
Sheet.
63