参数资料
型号: EP2C20F256I6N
厂商: ALTERA CORP
元件分类: FPGA
英文描述: FPGA, 1196 CLBS, PBGA256
封装: LEAD FREE, FBGA-256
文件页数: 65/168页
文件大小: 2206K
代理商: EP2C20F256I6N
Altera Corporation
5–67
February 2008
Cyclone II Device Handbook, Volume 1
DC Characteristics and Timing Specifications
Duty Cycle
Distortion
Duty cycle distortion (DCD) describes how much the falling edge of a
clock is off from its ideal position. The ideal position is when both the
clock high time (CLKH) and the clock low time (CLKL) equal half of the
clock period (T), as shown in Figure 5–8. DCD is the deviation of the
non-ideal falling edge from the ideal falling edge, such as D1 for the
falling edge A and D2 for the falling edge B (Figure 5–8). The maximum
DCD for a clock is the larger value of D1 and D2.
Figure 5–8. Duty Cycle Distortion
DCD expressed in absolution derivation, for example, D1 or D2 in
Figure 5–8, is clock-period independent. DCD can also be expressed as a
percentage, and the percentage number is clock-period dependent. DCD
as a percentage is defined as:
fVCO (3)
PLL internal VCO operating range
300
1,000
MHz
tARESET
Minimum pulse width on
areset signal.
10
ns
Notes to Table 5–54:
(1)
These numbers are preliminary and pending silicon characterization.
(2)
The tJITTER specification for the PLL[4..1]_OUT pins are dependent on the I/O pins in its VCCIO bank, how many
of them are switching outputs, how much they toggle, and whether or not they use programmable current strength.
(3)
If the VCO post-scale counter = 2, a 300- to 500-MHz internal VCO frequency is available.
(4)
This parameter is limited in the Quartus II software by the I/O maximum frequency. The maximum I/O frequency
is different for each I/O standard.
(5)
Cyclone II PLLs can track a spread-spectrum input clock that has an input jitter within ±200 ps.
(6)
For extended temperature devices, the maximum lock time is 500 us.
Table 5–54. PLL Specifications Note (1) (Part 2 of 2)
Symbol
Parameter
Min
Typ
Max
Unit
CLKH = T/2
CLKL = T/2
D1
D2
Falling Edge A
Ideal Falling Edge
Clock Period (T)
Falling Edge B
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EP2C20F256I8GA 制造商:Altera Corporation 功能描述:
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