參數(shù)資料
型號： XCV405E-6FG676C
廠商： Xilinx Inc
文件頁數(shù)： 39/118頁
文件大?。?/td> 0K
描述： IC FPGA 1.8V C-TEMP 676-FBGA
產(chǎn)品變化通告： FPGA Family Discontinuation 18/Apr/2011
標準包裝： 1
系列： Virtex®-E EM
LAB/CLB數(shù)： 2400
邏輯元件/單元數(shù)： 10800
RAM 位總計： 573440
輸入/輸出數(shù)： 404
門數(shù)： 129600
電源電壓： 1.71 V ~ 1.89 V
安裝類型： 表面貼裝
工作溫度： 0°C ~ 85°C
封裝/外殼： 676-BGA
供應商設備封裝： 676-FBGA（27x27）
Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays
DS025-2 (v3.0) March 21, 2014
Module 2 of 4
23
R
— OBSOLETE — OBSOLETE — OBSOLETE — OBSOLETE —
Design Factors
Use the following design considerations to avoid pitfalls and
improve success designing with Xilinx devices.
Input Clock
The output clock signal of a DLL, essentially a delayed ver-
sion of the input clock signal, reflects any instability on the
input clock in the output waveform. For this reason the qual-
ity of the DLL input clock relates directly to the quality of the
output clock waveforms generated by the DLL. The DLL
input clock requirements are specified in the data sheet.
In most systems a crystal oscillator generates the system
clock. The DLL can be used with any commercially available
quartz crystal oscillator. For example, most crystal oscilla-
tors produce an output waveform with a frequency tolerance
of 100 PPM, meaning 0.01 percent change in the clock
period. The DLL operates reliably on an input waveform with
a frequency drift of up to 1 ns — orders of magnitude in
excess of that needed to support any crystal oscillator in the
industry. However, the cycle-to-cycle jitter must be kept to
less than 300 ps in the low frequencies and 150 ps for the
high frequencies.
Input Clock Changes
Changing the period of the input clock beyond the maximum
drift amount requires a manual reset of the CLKDLL. Failure
to reset the DLL produces an unreliable lock signal and out-
put clock.
It is possible to stop the input clock with little impact to the
DLL. Stopping the clock should be limited to less than
100
μs to keep device cooling to a minimum. The clock
should be stopped during a Low phase, and when restored
the full High period should be seen. During this time
LOCKED stays High and remains High when the clock is
restored.
When the clock is stopped, one to four more clocks are still
observed as the delay line is flushed. When the clock is
restarted, the output clocks are not observed for one to four
clocks as the delay line is filled. The most common case is
two or three clocks.
In a similar manner, a phase shift of the input clock is also
possible. The phase shift propagates one to four clocks to
the output after the original shift, with no disruption to the
CLKDLL control.
Output Clocks
As mentioned earlier in the DLL pin descriptions, some
restrictions apply regarding the connectivity of the output
pins. The DLL clock outputs can drive an OBUF, a global
clock buffer BUFG, or they can route directly to destination
clock pins. The only BUFGs that the DLL clock outputs can
drive are the two on the same edge of the device (top or bot-
tom). In addition, the CLK2X output of the secondary DLL
can connect directly to the CLKIN of the primary DLL in the
same quadrant.
Do not use the DLL output clock signals until after activation
of the LOCKED signal. Prior to the activation of the
LOCKED signal, the DLL output clocks are not valid and
can exhibit glitches, spikes, or other spurious movement.
Useful Application Examples
The Virtex-E DLL can be used in a variety of creative and
useful applications. The following examples show some of
the more common applications. The Verilog and VHDL
example files are available at:
Standard Usage
The circuit shown in Figure 27 resembles the BUFGDLL
macro implemented to provide access to the RST and
LOCKED pins of the CLKDLL.
Board Level De-Skew of Multiple Non-Virtex-E
Devices
The circuit shown in Figure 28 can be used to de-skew a
system clock between a Virtex-E chip and other non-Vir-
tex-E chips on the same board. This application is com-
monly used when the Virtex-E device is used in conjunction
with other standard products such as SRAM or DRAM
devices. While designing the board level route, ensure that
the return net delay to the source equals the delay to the
other chips involved.
Figure 26: Virtex Series DLLs
x132_14_100799
B
R
A
M
DLL-3P
DLL-1P
DLL-3S
DLL-1S
DLL-2S
DLL-0S
DLL-2P
DLL-0P
Bottom Right
Half Edge
B
R
A
M
B
R
A
M
B
R
A
M
Figure 27: Standard DLL Implementation
CLK0
CLK90
CLK180
CLK270
CLK2X
CLKDV
LOCKED
CLKIN
CLKFB
RST
ds022_028_121099
CLKDLL
BUFG
IBUFG
IBUF
OBUF
相關PDF資料
PDF描述
XC6VCX130T-1FFG484C IC FPGA VIRTEX 6 128K 484FFGBGA
AT24C02C-SSHM-T IC EEPROM 2KBIT 1MHZ 8SOIC
BQ4014MB-120 IC NVSRAM 2MBIT 120NS 32DIP
XC6VLX75T-1FFG784C IC FPGA VIRTEX 6 74K 784FFGBGA
XC4VLX40-11FFG1148C IC FPGA VIRTEX-4 LX 40K 1148FBGA
相關代理商/技術參數(shù)
參數(shù)描述
XCV405E-6FG676I 功能描述:IC FPGA 1.8V 676-BGA RoHS:否 類別:集成電路 (IC) >> 嵌入式 - FPGA（現(xiàn)場可編程門陣列） 系列:Virtex®-E EM 產(chǎn)品變化通告:Step Intro and Pkg Change 11/March/2008 標準包裝:1 系列:Virtex®-5 SXT LAB/CLB數(shù):4080 邏輯元件/單元數(shù):52224 RAM 位總計:4866048 輸入/輸出數(shù):480 門數(shù):- 電源電壓:0.95 V ~ 1.05 V 安裝類型:表面貼裝 工作溫度:-40°C ~ 100°C 封裝/外殼:1136-BBGA，F(xiàn)CBGA 供應商設備封裝:1136-FCBGA 配用:568-5088-ND - BOARD DEMO DAC1408D750122-1796-ND - EVALUATION PLATFORM VIRTEX-5
XCV405E-6FG900C 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays
XCV405E-6FG900I 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays
XCV405E-7BG404C 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays
XCV405E-7BG404I 制造商:XILINX 制造商全稱:XILINX 功能描述:Virtex-E 1.8 V Extended Memory Field Programmable Gate Arrays
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*