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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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Chapter 12: IEEE 1149.1 (JTAG) Boundary-Scan Testing for the Cyclone III Device Family  
12–5  
I/O Voltage Support in a JTAG Chain  
Only the three mandatory JTAG 1149.1 JTAG instructions (BYPASS  
,
SAMPLE/PRELOAD  
,
EXTEST) and the FACTORYprivate instruction are supported from  
the JTAG pins upon power up. The FACTORYinstruction (instruction code:  
10 1000 0001) must be issued before the device starts loading the core  
configuration data to enable access to all other JTAG instructions. This instruction  
also clears the device configuration data and AES volatile key.  
IDCODEinstruction is not supported upon power-up, prior to issuing the FACTORY  
instruction. However, it is the default instruction when the TAP controller is in the  
reset state. Without loading any instructions, you can go to the Shift_DRstate and  
shift out the JTAG Device ID.  
IDCODE, CONFIG_IO, ACTIVE_DISENGAGE, HIGHZ, CLAMP, USERCODEand PULSE_NCONFIG  
instructions are supported, provided that the FACTORYinstruction is executed.  
I/O Voltage Support in a JTAG Chain  
A JTAG chain can contain several different devices. However, you must be cautious if  
the chain contains devices that have different VCCIO levels. The output voltage level of  
the TDOpin must meet the specifications of the TDIpin it drives. For Cyclone III device  
family, the TDOpin is powered by the VCCIO power supply. Because the VCCIO supply is  
3.3 V, the TDOpin drives out 3.3 V.  
Devices can interface with each other although they might have different VCCIO levels.  
For example, a device with a 3.3-V TDOpin can drive to a device with a 5.0-V TDIpin  
because 3.3 V meets the minimum TTL-level VIH for the 5.0-V TDIpin. JTAG pins on  
Cyclone III device family can support the input levels of VCCIO of bank 1A.  
1
For multiple devices in a JTAG chain with 3.0-V or 3.3-V I/O standard, you must  
connect a 25-series resistor on a TDOpin driving a TDIpin.  
You can also interface the TDIand TDOlines of the devices that have different VCCIO  
levels by inserting a level shifter between the devices. If possible, the JTAG chain must  
be built in such a way that a device with a higher VCCIO level drives to a device with  
an equal or lower VCCIO level. This way, a level shifter may be required only to shift  
the TDOlevel to a level acceptable to the JTAG tester.  
December 2011 Altera Corporation  
Cyclone III Device Handbook  
Volume 1  
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