XC5VLX220T-1FFG1738C Xilinx Inc, XC5VLX220T-1FFG1738C Datasheet - Page 224

• Manufacturer Part Number: XC5VLX220T-1FFG1738C
• Description: IC FPGA VIRTEX-5 220K 1738FBGA
• Manufacturer: Xilinx Inc
• Series: Virtex™-5 LXTr

Specifications of XC5VLX220T-1FFG1738C

• Total Ram Bits: 7815168
• Number Of Logic Elements/cells: 221184
• Number Of Labs/clbs: 17280
• Number Of I /o: 680
• Voltage - Supply: 0.95 V ~ 1.05 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 1738-BBGA, FCBGA
• No. Of Logic Blocks: 17280
• No. Of Macrocells: 220000
• Family Type: Virtex-5
• No. Of Speed Grades: 1
• No. Of I/o's: 680
• Clock Management: DCM, PLL
• Core Supply: RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Chapter 6: SelectIO Resources
224
Controlled Impedance Driver (Source Termination)
Controlled Impedance Driver with Half Impedance (Source Termination)
1.
2.
Alternatively, bidirectional point-to-point lines can use controlled-impedance drivers
(with 3-state buffers) on both ends.
Some I/O standards, such as LVCMOS, must have a drive impedance matching the
characteristic impedance of the driven line. DCI can provide controlled impedance output
drivers to eliminate reflections without an external source termination. The impedance is
set by the external reference resistors with resistance equal to the trace impedance.
The DCI I/O standards supporting the controlled impedance driver are: LVDCI_15,
LVDCI_18, LVDCI_25, LVDCI_33, HSLVDCI_15, HSLVDCI_18, HSLVDCI_25, and
HSLVDCI_33.
X-Ref Target - Figure 6-6
DCI also provides drivers with one half of the impedance of the reference resistors. This
doubling of the reference resistor value reduces the static power consumption through
these resistors by a factor of half. The DCI I/O standards supporting controlled impedance
drivers with half-impedance are LVDCI_DV2_15, LVDCI_DV2_18, and LVDCI_DV2_25.
Figure 6-7
reference resistors R must be 2 × Z
X-Ref Target - Figure 6-7
Driver with termination to V
Driver with termination to V
illustrates a controlled driver with half impedance inside a Virtex-5 device. The
Figure 6-7: Controlled Impedance Driver with Half Impedance
Figure 6-6
Figure 6-6: Controlled Impedance Driver
illustrates a controlled impedance driver in a Virtex-5 device.
www.xilinx.com
Virtex-5 DCI
CCO
CCO
Virtex-5 DCI
0
R/2
R
in order to match the impedance of Z
/2 (Split Termination, Thevenin equivalent)
(Single Termination)
IOB
IOB
UG190_6_04_012706
UG190_6_05_021206
Z
Z
0
0
Virtex-5 FPGA User Guide
UG190 (v5.3) May 17, 2010
0
.