XC4VFX20-10FFG672C Xilinx Inc, XC4VFX20-10FFG672C Datasheet - Page 371

• 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
R
Clock Event 2
The reset pulse is deasserted on the rising edge of CLKDIV. The difference in propagation
delay between the two ISERDES causes the SR input to come out of reset in two different
CLK cycles. If there were no internal re-timing, ISERDES1 would come out of reset one
CLK cycle before ISERDES0, which would leave both ISERDES out of sync.
Clock Event 3
The release of the reset signal at the SR input is re-timed internally to CLKDIV. This brings
ISERDES 0 and 1 back into sync.
Clock Event 4
The release of the reset signal at the SR input is re-timed internally to CLK.
Figure 8-5: Two ISERDES Coming Out of Reset Synchronously with One Another
Internal Reset
Internal Reset
(CLKDIV)
Signal at
SR Input
(CLK)
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ISERDES0
ISERDES1
ISERDES0
ISERDES1
ISERDES0
ISERDES1
CLKDIV
CLK
Input Serial-to-Parallel Logic Resources (ISERDES)
Event 1
Clock
Event 2
Clock
Event 3
Clock
Clock
Event 4
UG070_c8_21_041007
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