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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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12–6  
Chapter 12: IEEE 1149.1 (JTAG) Boundary-Scan Testing for the Cyclone III Device Family  
Guidelines for IEEE Std. 1149.1 BST  
Figure 12–1 shows the JTAG chain of mixed voltages and how a level shifter is  
inserted in the chain.  
Figure 12–1. JTAG Chain of Mixed Voltages  
Must be  
3.3 V  
tolerant  
TDI  
3.3 V  
2.5 V  
V
CCIO  
V
CCIO  
Tester  
TDO  
1.5 V  
1.8 V  
V
CCIO  
Level  
Shifter  
V
CCIO  
Shift TDO to  
level accepted by  
tester if necessary  
Must be  
1.8 V  
tolerant  
Must be  
2.5 V  
tolerant  
Guidelines for IEEE Std. 1149.1 BST  
Use the following guidelines when performing BST with IEEE Std. 1149.1 devices:  
If the 10 bit checkerboard pattern (1010101010) does not shift out of the instruction  
register via the TDOpin during the first clock cycle of the SHIFT_IRstate, the TAP  
controller did not reach the proper state. To solve this problem, try one of the  
following procedures:  
Verify that the TAP controller has reached the SHIFT_IRstate correctly. To  
advance the TAP controller to the SHIFT_IRstate, return to the RESETstate and  
send the code 01100to the TMSpin.  
Check the connections to the VCC, GND, JTAG, and dedicated configuration pins  
on the device.  
Perform a SAMPLE/PRELOADtest cycle prior to the first EXTESTtest cycle to ensure  
that known data is present at the device pins when you enter the EXTESTmode. If  
the OEJupdate register contains a 0, the data in the OUTJupdate register is driven  
out. The state must be known and correct to avoid contention with other devices in  
the system.  
Do not perform EXTESTtesting during ICR. This instruction is supported before or  
after ICR, but not during ICR. Use the CONFIG_IOinstruction to interrupt  
configuration and then perform testing, or wait for configuration to complete.  
If testing is performed before configuration, hold the nCONFIGpin low.  
Cyclone III Device Handbook  
Volume 1  
December 2011 Altera Corporation  
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