參數(shù)資料
型號(hào)： XC3S200A-4VQ100I
廠商： Xilinx Inc
文件頁數(shù)： 75/132頁
文件大?。?/td> 0K
描述： IC FPGA SPARTAN 3 100VQFP
標(biāo)準(zhǔn)包裝： 90
系列： Spartan®-3A
LAB/CLB數(shù)： 448
邏輯元件/單元數(shù)： 4032
RAM 位總計(jì)： 294912
輸入/輸出數(shù)： 68
門數(shù)： 200000
電源電壓： 1.14 V ~ 1.26 V
安裝類型： 表面貼裝
工作溫度： -40°C ~ 100°C
封裝/外殼： 100-TQFP
供應(yīng)商設(shè)備封裝： 100-VQFP（14x14）
DC and Switching Characteristics
DS529-3 (v2.0) August 19, 2010
47
Digital Clock Manager (DCM) Timing
For specification purposes, the DCM consists of three key
components: the Delay-Locked Loop (DLL), the Digital
Frequency Synthesizer (DFS), and the Phase Shifter (PS).
Aspects of DLL operation play a role in all DCM applications.
All such applications inevitably use the CLKIN and the
CLKFB inputs connected to either the CLK0 or the CLK2X
feedback, respectively. Thus, specifications in the DLL
tables (Table 36 and Table 37) apply to any application that
only employs the DLL component. When the DFS and/or the
PS components are used together with the DLL, then the
specifications listed in the DFS and PS tables (Table 38
through Table 41) supersede any corresponding ones in the
DLL tables. DLL specifications that do not change with the
addition of DFS or PS functions are presented in Table 36
Period jitter and cycle-cycle jitter are two of many different
ways of specifying clock jitter. Both specifications describe
statistical variation from a mean value.
Period jitter is the worst-case deviation from the ideal clock
period over a collection of millions of samples. In a
histogram of period jitter, the mean value is the clock period.
Cycle-cycle jitter is the worst-case difference in clock period
between adjacent clock cycles in the collection of clock
periods sampled. In a histogram of cycle-cycle jitter, the
mean value is zero.
Spread Spectrum
DCMs accept typical spread spectrum clocks as long as
they meet the input requirements. The DLL will track the
frequency changes created by the spread spectrum clock to
drive the global clocks to the FPGA logic. See XAPP469,
Spread-Spectrum Clocking Reception for Displays for
details.
Delay-Locked Loop (DLL)
Table 36: Recommended Operating Conditions for the DLL
Symbol
Description
Speed Grade
Units
-5
-4
Min
Max
Min
Max
Input Frequency Ranges
FCLKIN
CLKIN_FREQ_DLL
Frequency of the CLKIN clock input
5(2)
280(3)
5(2)
250(3)
MHz
Input Pulse Requirements
CLKIN_PULSE
CLKIN pulse width as a
percentage of the CLKIN
period
FCLKIN < 150 MHz
40%
60%
40%
60%
–
FCLKIN > 150 MHz
45%
55%
45%
55%
–
Input Clock Jitter Tolerance and Delay Path Variation(4)
CLKIN_CYC_JITT_DLL_LF
Cycle-to-cycle jitter at the
CLKIN input
FCLKIN < 150 MHz
–
±300
–±300
ps
CLKIN_CYC_JITT_DLL_HF
FCLKIN > 150 MHz
–
±150
–±150
ps
CLKIN_PER_JITT_DLL
Period jitter at the CLKIN input
–±1
ns
CLKFB_DELAY_VAR_EXT
Allowable variation of off-chip feedback delay
from the DCM output to the CLKFB input
–
±1
–
±1
ns
Notes:
1.
DLL specifications apply when any of the DLL outputs (CLK0, CLK90, CLK180, CLK270, CLK2X, CLK2X180, or CLKDV) are in use.
2.
The DFS, when operating independently of the DLL, supports lower FCLKIN frequencies. See Table 38.
3.
To support double the maximum effective FCLKIN limit, set the CLKIN_DIVIDE_BY_2 attribute to TRUE. This attribute divides the incoming
clock frequency by two as it enters the DCM. The CLK2X output reproduces the clock frequency provided on the CLKIN input.
4.
CLKIN input jitter beyond these limits might cause the DCM to lose lock.
5.
The DCM specifications are guaranteed when both adjacent DCMs are locked.
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