XC5VLX220T-2FF1738C Xilinx Inc, XC5VLX220T-2FF1738C Datasheet - Page 122
![IC FPGA VIRTEX-5 220K 1738FBGA](/photos/6/73/67306/xilinx-_1136-fbga_sml.jpg)
XC5VLX220T-2FF1738C
Manufacturer Part Number
XC5VLX220T-2FF1738C
Description
IC FPGA VIRTEX-5 220K 1738FBGA
Manufacturer
Xilinx Inc
Series
Virtex™-5 LXTr
Datasheets
1.XC5VLX30-1FFG324C.pdf
(91 pages)
2.XC5VLX30-1FFG324C.pdf
(13 pages)
3.XC5VLX30-1FFG324C.pdf
(385 pages)
Specifications of XC5VLX220T-2FF1738C
Number Of Logic Elements/cells
221184
Number Of Labs/clbs
17280
Total Ram Bits
7815168
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
For Use With
HW-AFX-FF1738-500-G - BOARD DEV VIRTEX 5 FF1738
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Number Of Gates
-
Available stocks
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Part Number
Manufacturer
Quantity
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Company:
Part Number:
XC5VLX220T-2FF1738C
Manufacturer:
Xilinx Inc
Quantity:
10 000
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Chapter 4: Block RAM
122
Cascadable Block RAM
Byte-wide Write Enable
In the Virtex-5 block RAM architecture, two 32K x 1 RAMs can be combined to form one
64K x 1 RAM without using local interconnect or additional CLB logic resources. Any two
adjacent block RAMs can be cascaded to generate a 64K x 1 block RAM. Increasing the
depth of the block RAM by cascading two block RAMs is available only in the 64K x 1
mode. Further information on cascadable block RAM is described in the
RAMB18 and RAMB36 Primitive Design Considerations
deeper sizes, consult the
block RAM with the appropriate ports connected in the Cascadable mode.
X-Ref Target - Figure 4-7
The byte-wide write enable feature of the block RAM gives the capability to write eight bit
(one byte) portions of incoming data. There are four independent byte-wide write enable
inputs to the RAMB36 true dual-port RAM. There are eight independent byte-wide write
enable inputs to block RAM in simple dual-port mode (RAMB36SDP).
summarizes the byte-wide write enables for the 36K and 18K block RAM. Each byte-wide
write enable is associated with one byte of input data and one parity bit. All byte-wide
write enable inputs must be driven in all data width configurations. This feature is useful
when using block RAM to interface with a microprocessor. Byte-wide write enable is not
available in the multirate FIFO or ECC mode. Byte-wide write enable is further described
in the
Figure 4-8
Table 4-4: Available Byte-wide Write Enables
Interconnect
RAMB36
RAMB36SDP
Primitive
Additional RAMB18 and RAMB36 Primitive Design Considerations
WE[3:0]
WE[3:0]
A[14:0]
A[14:0]
A15
A15
DI
DI
shows the byte-wide write-enable timing diagram for the RAMB36.
Block RAM
RAM_EXTENSION =
RAM_EXTENSION =
LOWER(1)
UPPER(0)
Maximum Bit Width
0
1
0
1
Creating Larger RAM Structures
Figure 4-7: Cascadable Block RAM
www.xilinx.com
36
72
D Q
D Q
D Q
D Q
D Q
D Q
D Q
D Q
DI
A[14:0]
A15
WE
DI
A[14:0]
A15
WE
Number of Byte-wide Write Enables
D0
D0
section. For other wider and/or
Optional
Output FF
Optional
Output FF
section.
Connect to logic High or Low
Virtex-5 FPGA User Guide
UG190 (v5.3) May 17, 2010
4
8
CASCADEOUT
Figure 4-7
(No Connect)
CASCADEIN
Table 4-4
CASCADEIN of Top
CASCADEOUT of Bottom
Additional
section.
1
0
1
0
shows the
ug190_4_07_071607
D0
D0
Not Used
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