XC5VLX220T-2FF1738I Xilinx Inc, XC5VLX220T-2FF1738I Datasheet - Page 155
![FPGA Virtex®-5 Family 221184 Cells 65nm (CMOS) Technology 1V 1738-Pin FCBGA](/photos/6/73/67306/xilinx-_1136-fbga_sml.jpg)
XC5VLX220T-2FF1738I
Manufacturer Part Number
XC5VLX220T-2FF1738I
Description
FPGA Virtex®-5 Family 221184 Cells 65nm (CMOS) Technology 1V 1738-Pin FCBGA
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-2FF1738I
Package
1738FCBGA
Family Name
Virtex®-5
Device Logic Units
221184
Typical Operating Supply Voltage
1 V
Maximum Number Of User I/os
680
Ram Bits
7815168
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
-40°C ~ 100°C
Package / Case
1738-BBGA, FCBGA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With
HW-AFX-FF1738-500-G - BOARD DEV VIRTEX 5 FF1738
Number Of Gates
-
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
XC5VLX220T-2FF1738I
Manufacturer:
Xilinx Inc
Quantity:
10 000
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Virtex-5 FPGA User Guide
UG190 (v5.3) May 17, 2010
Case 4: Reading From An Empty or Almost Empty FIFO
There is minimum time between a rising read-clock and write-clock edge to guarantee that
AFULL will be deasserted. If this minimum is not met, the deassertion of AFULL can take
an additional write clock cycle.
Prior to the operations performed in
this example, the timing diagram reflects standard mode. For FWFT mode, data at DO
appears one read-clock cycle earlier.
X-Ref Target - Figure 4-24
Clock Event 1: Read Operation and Assertion of Almost EMPTY Signal
During a read operation to an almost empty FIFO, the Almost EMPTY signal is asserted.
•
•
•
Clock Event 2: Read Operation and Assertion of EMPTY Signal
The EMPTY signal pin is asserted when the FIFO is empty.
•
•
•
In the event that the FIFO is empty and a write followed by a read is performed, the
EMPTY signal remains asserted.
AEMPTY
WRCLK
RDERR
EMPTY
RDCLK
WREN
RDEN
Figure 4-24: Reading From an Empty / Almost Empty FIFO (Standard Mode)
At time T
RDEN input of the FIFO.
At time T
outputs of the FIFO.
At time T
asserted at the AEMPTY output pin of the FIFO.
Read enable remains asserted at the RDEN input of the FIFO.
At time T
the DO outputs of the FIFO.
At time T
output pin of the FIFO.
DO
FCCK_RDEN
FCKO_DO
FCKO_AEMPTY
FCKO_DO
FCKO_EMPTY
1
T
FCCK_RDEN
, after clock event 1 (RDCLK), data 00 becomes valid at the DO
, after clock event 2 (RDCLK), data 04 (last data) becomes valid at
00
T
, before clock event 1 (RDCLK), read enable becomes valid at the
FCKO_DO
, after clock event 2 (RDCLK), Empty is asserted at the EMPTY
www.xilinx.com
, one clock cycle after clock event 1 (RDCLK), Almost Empty is
01
T
FCKO_AEMPTY
Figure
T
FCKO_EMPTY
T
02
FCKO_DO
4-24, the FIFO is almost completely empty. In
T
FCKO_RDERR
FIFO Timing Models and Parameters
03
2
04
3
T
FCKO_RDERR
4
ug190_4_21_032506
T
FCCK_RDEN
155
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