DS031 Datasheet, PDF (33/318 Pages) Xilinx, Inc – Summary of Features

R
SelectRAM Blocks
Virtex-II Platform FPGAs: Functional Description
SelectRAM Blocks
SelectRAM Blocks
ds031_38_101000
Figure 34: Block SelectRAM (2-column, 4-column, and 6-column)
Total Amount of SelectRAM Memory
Table 19 shows the amount of block SelectRAM memory
available for each Virtex-II device. The 18 Kbit SelectRAM
blocks are cascadable to implement deeper or wider single- or
dual-port memory resources.
Table 19: Virtex-II SelectRAM Memory Available
Total SelectRAM Memory
Device
Blocks
in Kbits
in Bits
XC2V40
4
72
73,728
XC2V80
8
144
147,456
XC2V250
24
432
442,368
XC2V500
32
576
589,824
XC2V1000
40
720
737,280
XC2V1500
48
864
884,736
XC2V2000
56
1,008
1,032,192
Table 19: Virtex-II SelectRAM Memory Available
Total SelectRAM Memory
Device
Blocks
in Kbits
in Bits
XC2V3000
96
1,728
1,769,472
XC2V4000
120
2,160
2,211,840
XC2V6000
144
2,592
2,654,208
XC2V8000
168
3,024
3,096,576
18-Bit x 18-Bit Multipliers
Introduction
A Virtex-II multiplier block is an 18-bit by 18-bit 2’s comple-
ment signed multiplier. Virtex-II devices incorporate many
embedded multiplier blocks. These multipliers can be asso-
ciated with an 18 Kbit block SelectRAM resource or can be
used independently. They are optimized for high-speed
operations and have a lower power consumption compared
to an 18-bit x 18-bit multiplier in slices.
DS031-2 (v3.5) November 5, 2007
Product Specification
www.xilinx.com
Module 2 of 4
25