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XC5202-5VQ100I 参数 Datasheet PDF下载

XC5202-5VQ100I图片预览
型号: XC5202-5VQ100I
PDF下载: 下载PDF文件 查看货源
内容描述: 现场可编程门阵列(FPGA)的\n [Field Programmable Gate Array (FPGA) ]
分类和应用: 现场可编程门阵列可编程逻辑时钟
文件页数/大小: 73 页 / 583 K
品牌: ETC [ ETC ]
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XC5200 Series Field Programmable Gate Arrays  
non-zero hold, attach a NODELAY attribute or property to  
the flip-flop or input buffer.  
For XC5200 devices, maximum total capacitive load for  
simultaneous fast mode switching in the same direction is  
200 pF for all package pins between each Power/Ground  
pin pair. For some XC5200 devices, additional internal  
Power/Ground pin pairs are connected to special Power  
and Ground planes within the packages, to reduce ground  
bounce.  
IOB Output Signals  
Output signals can be optionally inverted within the IOB,  
and pass directly to the pad. As with the inputs, a CLB  
flip-flop or latch can be used to store the output signal.  
For slew-rate limited outputs this total is two times larger for  
each device type: 400 pF for XC5200 devices. This maxi-  
mum capacitive load should not be exceeded, as it can  
result in ground bounce of greater than 1.5 V amplitude and  
more than 5 ns duration. This level of ground bounce may  
cause undesired transient behavior on an output, or in the  
internal logic. This restriction is common to all high-speed  
digital ICs, and is not particular to Xilinx or the XC5200  
Series.  
An active-High 3-state signal can be used to place the out-  
put buffer in a high-impedance state, implementing 3-state  
outputs or bidirectional I/O. Under configuration control,  
the output (OUT) and output 3-state (T) signals can be  
inverted. The polarity of these signals is independently  
configured for each IOB.  
The XC5200 devices provide a guaranteed output sink cur-  
rent of 8 mA.  
Supported destinations for XC5200-Series device outputs  
are shown in Table 6.(For a detailed discussion of how to  
interface between 5 V and 3.3 V devices, see the 3V Prod-  
ucts section of The Programmable Logic Data Book.)  
XC5200-Series devices have a feature called “Soft  
Start-up,” designed to reduce ground bounce when all out-  
puts are turned on simultaneously at the end of configura-  
tion. When the configuration process is finished and the  
device starts up, the first activation of the outputs is auto-  
matically slew-rate limited. Immediately following the initial  
activation of the I/O, the slew rate of the individual outputs  
is determined by the individual configuration option for  
each IOB.  
An output can be configured as open-drain (open-collector)  
by placing an OBUFT symbol in a schematic or HDL code,  
then tying the 3-state pin (T) to the output signal, and the  
input pin (I) to Ground. (See Figure 12.)  
Table 6: Supported Destinations for XC5200-Series  
Outputs  
Global Three-State  
XC5200 Output Mode  
A separate Global 3-State line (not shown in Figure 11)  
forces all FPGA outputs to the high-impedance state,  
unless boundary scan is enabled and is executing an  
EXTEST instruction. This global net (GTS) does not com-  
pete with other routing resources; it uses a dedicated distri-  
bution network.  
5 V,  
CMOS  
Destination  
XC5200 device, V =3.3 V,  
CC  
some  
CMOS-threshold inputs  
Any typical device, V = 3.3 V,  
1
CC  
CMOS-threshold inputs  
GTS can be driven from any user-programmable pin as a  
global 3-state input. To use this global net, place an input  
pad and input buffer in the schematic or HDL code, driving  
the GTS pin of the STARTUP symbol. A specific pin loca-  
tion can be assigned to this input using a LOC attribute or  
property, just as with any other user-programmable pad. An  
inverter can optionally be inserted after the input buffer to  
invert the sense of the Global 3-State signal. Using GTS is  
similar to Global Reset. See Figure 8 on page 90 for  
details. Alternatively, GTS can be driven from any internal  
node.  
Any device, V = 5 V,  
CC  
TTL-threshold inputs  
Any device, V = 5 V,  
CC  
CMOS-threshold inputs  
1. Only if destination device has 5-V tolerant inputs  
OPAD  
Other IOB Options  
OBUFT  
X6702  
There are a number of other programmable options in the  
XC5200-Series IOB.  
Figure 12: Open-Drain Output  
Pull-up and Pull-down Resistors  
Output Slew Rate  
Programmable IOB pull-up and pull-down resistors are  
useful for tying unused pins to Vcc or Ground to minimize  
power consumption and reduce noise sensitivity. The con-  
figurable pull-up resistor is a p-channel transistor that pulls  
The slew rate of each output buffer is, by default, reduced,  
to minimize power bus transients when switching non-criti-  
cal signals. For critical signals, attach a FAST attribute or  
property to the output buffer or flip-flop.  
7-92  
November 5, 1998 (Version 5.2)