参数资料
型号: XA3S200A-4FTG256I
厂商: Xilinx Inc
文件页数: 22/57页
文件大小: 0K
描述: IC FPGA SPARTAN-3A 200K 256-FBGA
产品培训模块: Extended Spartan 3A FPGA Family
标准包装: 90
系列: Spartan®-3A XA
LAB/CLB数: 448
逻辑元件/单元数: 4032
RAM 位总计: 294912
输入/输出数: 195
门数: 200000
电源电压: 1.14 V ~ 1.26 V
安装类型: 表面贴装
工作温度: -40°C ~ 100°C
封装/外壳: 256-LBGA
供应商设备封装: 256-FTBGA
XA Spartan-3A Automotive FPGA Family Data Sheet
DS681 (v2.0) April 22, 2011
Product Specification
29
Timing Measurement Methodology
When measuring timing parameters at the programmable I/Os, different signal standards call for different test conditions.
Table 26 lists the conditions to use for each standard.
The method for measuring Input timing is as follows: A signal that swings between a Low logic level of VL and a High logic
level of VH is applied to the Input under test. Some standards also require the application of a bias voltage to the VREF pins
of a given bank to properly set the input-switching threshold. The measurement point of the Input signal (VM) is commonly
located halfway between VL and VH.
The Output test setup is shown in Figure 9. A termination voltage VT is applied to the termination resistor RT, the other end
of which is connected to the Output. For each standard, RT and VT generally take on the standard values recommended for
minimizing signal reflections. If the standard does not ordinarily use terminations (for example, LVCMOS, LVTTL), then RT
is set to 1 M
to indicate an open connection, and V
T is set to zero. The same measurement point (VM) that was used at the
Input is also used at the Output.
X-Ref Target - Figure 9
Figure 9: Output Test Setup
FPGA Output
VT (VREF)
RT (RREF)
VM (VMEAS)
CL (CREF)
DS681_08_041111
Notes:
1.
The names shown in parentheses are
used in the IBIS file.
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