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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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11–6  
Chapter 11: In-System Programmability Guidelines for MAX II Devices  
Sequential versus Concurrent Programming  
f
For more information about disabling the IEEE 1149.1 circuitry, refer to the Disabling  
IEEE Std. 1149.1 BST Circuitry section of the IEEE 1149.1 (JTAG) Boundary-Scan Testing  
chapter in the MAX II Device Handbook.  
Working with Different Voltage Levels  
When devices in a JTAG chain operate at different voltage levels, a device’s output  
voltage specification must meet the subsequent device’s input voltage specification. If  
the devices do not meet this criteria, you must add additional circuitry, such as a level-  
shifter, to adjust the voltage levels. For example, when a 5.0-V device drives a 2.5-V  
device, you must adjust the 5.0-V device’s output voltage to meet the 2.5-V device’s  
input voltage specification.  
Because all devices in a JTAG chain are tied together, you must also ensure that the  
first device’s TDOoutput meets the subsequent device’s TDIinput voltage  
specification to program a chain of devices successfully.  
All MAX II devices include a MultiVolt I/O feature, which allows these devices to  
interface with systems that have different supply voltages. All MAX II devices can be  
set for 3.3-V, 2.5-V, 1.8-V, or 1.5-V I/O operation. The JTAG pins of MAX II devices  
support these voltage levels. Refer to the MAX II Architecture chapter in the MAX II  
Device Handbook for I/O standard compatibility for each VCCIO voltage. For example,  
V
CCIO1 at 3.3 V does not allow JTAG input pins to accept 1.8- or 1.5-V signals.  
Sequential versus Concurrent Programming  
This section describes how to program multiple devices using sequential and  
concurrent programming. The JTAG chain setup for sequential and concurrent  
programming is similar, only the programming algorithms are different.  
Sequential Programming  
Sequential programming is the process of programming multiple devices in a chain,  
one device at a time. After the first device in the chain is finished being programmed,  
the next device is programmed. This sequence continues until all specified devices in  
the JTAG chain are programmed. After a device is programmed, it will be in bypass  
mode to allow data to be passed to the subsequent devices in the chain. The devices in  
the chain do not go into user mode until all the devices are programmed.  
Concurrent Programming  
Concurrent programming is used to program devices from the same family (for  
example, the MAX II family) in parallel. The programming time is slightly longer than  
the time needed to program the largest device in the chain, resulting in considerably  
faster programming times than sequential programming (where programming time is  
equal to the sum of individual programming times for all devices). Higher clock rates  
for shifting data result in even greater time savings.  
Concurrent programming of devices can be done using Serial Vector Format files  
(.svf), Jam files, or JBC files created from the Quartus II software. See Figure 11–2.  
1. On the Tools menu, click Programmer.  
2. Click Add File and select programming files for the respective devices.  
MAX II Device Handbook  
© October 2008 Altera Corporation