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CLK14_6N 参数 Datasheet PDF下载

CLK14_6N图片预览
型号: CLK14_6N
PDF下载: 下载PDF文件 查看货源
内容描述: 的Cyclone III器件手册 [Cyclone III Device Handbook]
分类和应用:
文件页数/大小: 274 页 / 7302 K
品牌: ALTERA [ ALTERA CORPORATION ]
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Chapter 5: Clock Networks and PLLs in the Cyclone III Device Family  
5–31  
PLL Reconfiguration  
Table 5–7. Loop Filter Control of High Frequency Capacitor  
LFC[1]  
LFC[0]  
Setting (Decimal)  
0
0
1
0
1
1
0
1
3
Bypassing PLL Counter  
Bypassing a PLL counter results in a multiply (M counter) or a divide (N, C0 to C4  
counters) factor of one.  
Table 5–8 lists the settings for bypassing the counters in Cyclone III device family  
PLLs.  
Table 5–8. PLL Counter Settings  
PLL Scan Chain Bits [0..8] Settings  
Description  
LSB  
MSB  
(1)  
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1
PLL counter bypassed  
(1)  
0
PLL counter not bypassed  
Note to Table 5–8:  
(1) Bypass bit.  
To bypass any of the PLL counters, set the bypass bit to 1. The values on the other bits  
are then ignored.  
Dynamic Phase Shifting  
The dynamic phase shifting feature allows the output phase of individual PLL  
outputs to be dynamically adjusted relative to each other and the reference clock  
without sending serial data through the scan chain of the corresponding PLL. This  
feature simplifies the interface and allows you to quickly adjust tCO delays by  
changing output clock phase shift in real time. This is achieved by incrementing or  
decrementing the VCO phase-tap selection to a given C counter or to the M counter.  
The phase is shifted by 1/8 the VCO frequency at a time. The output clocks are active  
during this phase reconfiguration process.  
Table 5–9 lists the control signals that are used for dynamic phase shifting.  
Table 5–9. Dynamic Phase Shifting Control Signals (Part 1 of 2)  
Signal Name  
Description  
Source  
Destination  
PLL  
reconfiguration  
circuit  
Counter Select. Three bits decoded to select  
either the M or one of the C counters for  
phase adjustment. One address map to select  
all C counters. This signal is registered in the  
Logic array or I/O  
pins  
PHASECOUNTERSELECT[2:0]  
PLL on the rising edge of SCANCLK  
.
Selects dynamic phase shift direction; 1= UP,  
0 = DOWN. Signal is registered in the PLL on  
PLL  
reconfiguration  
circuit  
Logic array or I/O  
pins  
PHASEUPDOWN  
the rising edge of SCANCLK  
.
July 2012 Altera Corporation  
Cyclone III Device Handbook  
Volume 1  
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