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參數(shù)資料
| 型號： | XA3S1400A-4FGG484Q |
| 廠商： | Xilinx Inc |
| 文件頁數(shù)： | 25/57頁 |
| 文件大小： | 0K |
| 描述： | IC FPGA SPARTAN3A 1400K 484-FBGA |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | Spartan®-3A XA |
| LAB/CLB數(shù)： | 2816 |
| 邏輯元件/單元數(shù)： | 25344 |
| RAM 位總計： | 589824 |
| 輸入/輸出數(shù)： | 375 |
| 門數(shù)： | 1400000 |
| 電源電壓： | 1.14 V ~ 1.26 V |
| 安裝類型： | 表面貼裝 |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 484-BBGA |
| 供應(yīng)商設(shè)備封裝： | 484-FBGA |
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XA Spartan-3A Automotive FPGA Family Data Sheet
DS681 (v2.0) April 22, 2011
Product Specification
31
The capacitive load (CL) is connected between the output and GND. The Output timing for all standards, as published in the
speed files and the data sheet, is always based on a CL value of zero. High-impedance probes (less than 1 pF) are used for
all measurements. Any delay that the test fixture might contribute to test measurements is subtracted from those
measurements to produce the final timing numbers as published in the speed files and data sheet.
Using IBIS Models to Simulate Load Conditions in Application
IBIS models permit the most accurate prediction of timing delays for a given application. The parameters found in the IBIS
model (VREF, RREF, and VMEAS) correspond directly with the parameters used in Table 26 (VT, RT, and VM). Do not confuse
VREF (the termination voltage) from the IBIS model with VREF (the input-switching threshold) from the table. A fourth
parameter, CREF, is always zero. The four parameters describe all relevant output test conditions. IBIS models are found in
the Xilinx development software as well as at the following link:
Delays for a given application are simulated according to its specific load conditions as follows:
1.
Simulate the desired signal standard with the output driver connected to the test setup shown in Figure 9. Use
2.
Record the time to VM.
3.
Simulate the same signal standard with the output driver connected to the PCB trace with load. Use the appropriate IBIS
model (including VREF, RREF, CREF, and VMEAS values) or capacitive value to represent the load.
4.
Record the time to VMEAS.
5.
Compare the results of steps 2 and 4. Add (or subtract) the increase (or decrease) in delay to (or from) the appropriate
Output standard adjustment (Table 25) to yield the worst-case delay of the PCB trace.
DIFF_SSTL18_II
0.9
VREF – 0.5
VREF + 0.5
50
0.9
VREF
DIFF_SSTL2_I
1.25
VREF – 0.5
VREF + 0.5
50
1.25
VREF
DIFF_SSTL2_II
1.25
VREF – 0.5
VREF + 0.5
50
1.25
VREF
DIFF_SSTL3_I
1.5
VREF – 0.5
VREF + 0.5
50
1.5
VREF
DIFF_SSTL3_II
1.5
VREF – 0.5
VREF + 0.5
50
1.5
VREF
Notes:
1.
Descriptions of the relevant symbols are as follows:
VREF – The reference voltage for setting the input switching threshold
VICM – The common mode input voltage
VM – Voltage of measurement point on signal transition
VL – Low-level test voltage at Input pin
VH – High-level test voltage at Input pin
RT – Effective termination resistance, which takes on a value of 1 M when no parallel termination is required
VT – Termination voltage
2.
The load capacitance (CL) at the Output pin is 0 pF for all signal standards.
3.
According to the PCI specification.
Table 26: Test Methods for Timing Measurement at I/Os (Cont’d)
Signal Standard
(IOSTANDARD)
Inputs
Outputs
Inputs and
Outputs
VREF (V)
VL (V)
VH (V)
RT ()VT (V)
VM (V)
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