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CLK3_1N 参数 Datasheet PDF下载

CLK3_1N图片预览
型号: CLK3_1N
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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9–64  
Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family  
Configuration Features  
ACTIVE_ENGAGE  
The ACTIVE_ENGAGEinstruction allows you to re-engage a disengaged active controller.  
You can issue this instruction any time during configuration or user mode to re-  
engage an already disengaged active controller as well as trigger reconfiguration of  
the Cyclone III device family in the active configuration scheme specified by the  
MSEL pin settings.  
The ACTIVE_ENGAGEinstruction functions as the PULSE_NCONFIGinstruction when the  
device is in passive configuration schemes (PS or FPP). The nCONFIGpin is disabled  
when the ACTIVE_ENGAGEinstruction is issued.  
1
Altera does not recommend using the ACTIVE_ENGAGEinstruction but it is provided as  
a fail-safe instruction for re-engaging the active configuration (AS or AP) controllers.  
Changing the Start Boot Address of the AP Flash  
In the AP configuration scheme, for Cyclone III devices only, you can change the  
default configuration boot address of the parallel flash memory to any desired  
address using the APFC_BOOT_ADDR JTAG instruction.  
APFC_BOOT_ADDR  
The APFC_BOOT_ADDRinstruction is for Cyclone III devices only and allows you to  
define a start boot address for the parallel flash memory in the AP configuration  
scheme.  
This instruction shifts in a start boot address for the AP flash. When this instruction  
becomes the active instruction, the TDIand TDOpins are connected through a 22-bit  
active boot address shift register. The shifted-in boot address bits get loaded into the  
22-bit AP boot address update register, which feeds into the AP controller. The content  
of the AP boot address update register can be captured and shifted-out of the active  
boot address shift register from TDO  
.
The boot address in the boot address shift register and update register are shifted to  
the right (in the LSB direction) by two bits versus the intended boot address. The  
reason for this is that the two LSB of the address are not accessible. When this boot  
address is fed into the AP controller, two 0s are attached in the end as LSB, thereby  
pushing the shifted-in boot address to the left by two bits, which become the actual  
AP boot address the AP controller gets.  
If you have enabled the remote update feature, the APFC_BOOT_ADDRinstruction sets  
the boot address for the factory configuration only.  
1
The APFC_BOOT_ADDRinstruction is retained after reconfiguration while the system  
board is still powered on. However, you must reprogram the instruction whenever  
you restart the system board.  
Device Configuration Pins  
Table 9–21 through Table 9–23 describe the connections and functionality of all the  
configuration-related pins on Cyclone III device family.  
Cyclone III Device Handbook  
Volume 1  
August 2012 Altera Corporation  
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