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EPM240T100C5 参数 Datasheet PDF下载

EPM240T100C5图片预览
型号: EPM240T100C5
PDF下载: 下载PDF文件 查看货源
内容描述: [最大II器件]
分类和应用: 可编程逻辑器件输入元件PC
文件页数/大小: 295 页 / 3815 K
品牌: ALTERA [ ALTERA CORPORATION ]
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11–8  
Chapter 11: In-System Programmability Guidelines for MAX II Devices  
ISP Troubleshooting Guidelines  
TDO Is Not Connected  
You will receive an error if the TDOport of one device in the chain is not connected.  
During in-system programming, data must be shifted in and out of each device in the  
JTAG chain through the JTAG pins. Therefore, each device’s TDOport must be  
connected to the subsequent device’s TDIport, and the last device’s TDOport must be  
connected to the download cable’s TDOport.  
Incomplete JTAG Chain  
You will receive an error if the JTAG chain is not complete. To check if an incomplete  
JTAG chain is causing the error, use an oscilloscope to monitor vectors coming out of  
each device in the chain. If each device’s TDOport does not toggle during in-system  
programming, your JTAG chain is not complete.  
Noisy TCK Signal  
Noise on the TCKsignal is the most common reason for in-system programming  
errors. Noisy transitions on rising or falling edges can cause incorrect clocking of the  
IEEE Std. 1149.1 TAP controller, causing the state machine to be lost and in-system  
programming to fail. For more information about dealing with noisy TCKsignals,  
refer to “TCK Signal” on page 11–4.  
Jam Player Ported Incorrectly  
You will receive an error if the Jam Player was not ported correctly for your platform.  
To check if the Jam Player is causing the error, apply the IDCODE instruction to the  
target device using a Jam file. You can use a Jam file to load an IDCODEinstruction  
and then shift out the IDCODEvalue. This test determines if the JTAG chain is set up  
correctly and if you can read and write to the JTAG chain properly.  
You can download the idcode.zip file from the Altera website to obtain the  
idcode.jam file.  
Troubleshooting Tips  
This section discusses some additional suggestions for troubleshooting ISP issues.  
Verify the JTAG Chain Continuity  
For in-system programming to occur successfully, the number of devices physically in  
the JTAG chain must match the number reported in the Quartus II software. The  
following steps show one simple way to verify that the JTAG chain is connected  
properly.  
1. Open the Programmer in the Quartus II software.  
2. Click Auto Detect in the Programmer. The Quartus II software reports the number  
of devices found on the JTAG chain. If this fails, check the JTAG chain to make sure  
it is not broken.  
MAX II Device Handbook  
© October 2008 Altera Corporation