
Virtex-II Platform FPGAs: Functional Description
R
DS031-2 (v3.5) November 5, 2007
Module 2 of 4
Product Specification
25
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.
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.
Figure 34: Block SelectRAM (2-column, 4-column, and 6-column)
2
CLB
columns
2
CLB
columns
2
CLB
columns
n
CLB
columns
2
CLB
columns
n
CLB
columns
2
CLB
columns
2
CLB
columns
2
CLB
columns
n
CLB
columns
n
CLB
columns
n
CLB
columns
2
CLB
columns
n
CLB
columns
SelectRAM Blocks
ds031_38_101000
2
CLB
column
2
CLB
columns
SelectRAM Blocks
2
CLB
column
2
CLB
columns
Table 19: Virtex-II SelectRAM Memory Available
Device
Total SelectRAM Memory
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
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
Table 19: Virtex-II SelectRAM Memory Available
Device
Total SelectRAM Memory
Blocks
in Kbits
in Bits