參數(shù)資料
型號(hào)： XC2S30-6TQ144C
廠商： Xilinx Inc
文件頁(yè)數(shù)： 25/99頁(yè)
文件大小： 0K
描述： IC FPGA 2.5V C-TEMP 144-TQFP
標(biāo)準(zhǔn)包裝： 60
系列： Spartan®-II
LAB/CLB數(shù)： 216
邏輯元件/單元數(shù)： 972
RAM 位總計(jì)： 24576
輸入/輸出數(shù)： 92
門(mén)數(shù)： 30000
電源電壓： 2.375 V ~ 2.625 V
安裝類(lèi)型： 表面貼裝
工作溫度： 0°C ~ 85°C
封裝/外殼： 144-LQFP
供應(yīng)商設(shè)備封裝： 144-TQFP（20x20）
Spartan-II FPGA Family: Functional Description
DS001-2 (v2.8) June 13, 2008
Module 2 of 4
Product Specification
31
R
Useful Application Examples
The Spartan-II FPGA DLL can be used in a variety of
creative and useful applications. The following examples
show some of the more common applications.
Standard Usage
The circuit shown in Figure 28 resembles the BUFGDLL
macro implemented to provide access to the RST and
LOCKED pins of the CLKDLL.
Deskew of Clock and Its 2x Multiple
The circuit shown in Figure 29 implements a 2x clock
multiplier and also uses the CLK0 clock output with zero ns
skew between registers on the same chip. A clock divider
circuit could alternatively be implemented using similar
connections.
Because any single DLL can only access at most two
BUFGs, any additional output clock signals must be routed
from the DLL in this example on the high speed backbone
routing.
Generating a 4x Clock
By connecting two DLL circuits each implementing a 2x
clock multiplier in series as shown in Figure 30, a 4x clock
multiply can be implemented with zero skew between
registers in the same device.
If other clock output is needed, the clock could access a
BUFG only if the DLLs are constrained to exist on opposite
edges (Top or Bottom) of the device.
When using this circuit it is vital to use the SRL16 cell to
reset the second DLL after the initial chip reset. If this is not
done, the second DLL may not recognize the change of
frequencies from when the input changes from a 1x (25/75)
waveform to a 2x (50/50) waveform. It is not recommended
to cascade more than two DLLs.
For design examples and more information on using the
DLL, see XAPP174, Using Delay-Locked Loops in Spartan-II
FPGAs.
Figure 28: Standard DLL Implementation
Figure 29: DLL Deskew of Clock and 2x Multiple
CLK0
CLK90
CLK180
CLK270
CLK2X
CLKDV
LOCKED
CLKIN
CLKFB
RST
DS001_28_061200
CLKDLL
BUFG
IBUFG
OBUF
IBUF
CLK0
CLK90
CLK180
CLK270
CLK2X
CLKDV
LOCKED
CLKIN
CLKFB
RST
DS001_29_061200
CLKDLL
BUFG
IBUFG
OBUF
BUFG
IBUF
Figure 30: DLL Generation of 4x Clock
DS001_30_061200
RST
CLKFB
CLKIN
CLKDLL
LOCKED
CLKDV
INV
BUFG
OBUF
SRL16
D
A3
A2
A1
A0
WCLK
BUFG
Q
IBUFG
CLK2X
CLK0
CLK90
CLK180
CLK270
RST
CLKFB
CLKIN
CLKDLL
LOCKED
CLKDV
CLK2X
CLK0
CLK90
CLK180
CLK270
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XC2S30-6VQ100I 制造商:XILINX 制造商全稱(chēng):XILINX 功能描述:Spartan-II 2.5V FPGA Family:Introduction and Ordering Information
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