參數資料
型號: TSC21020F-20MB
英文描述: FPGA, CYCLONE III, 16K LE, 256UBGA Programmable Logic Type:FPGA; Logic IC function:FPGA; Logic IC family:Cyclone III; Logic IC Base Number:3; I/O lines, No. of:168;
中文描述: 數字信號處理器| 32位|的CMOS | RAD數據通信硬| QFL | 256PIN |陶瓷
文件頁數: 41/51頁
文件大小: 763K
代理商: TSC21020F-20MB
41
TSC21020F
4153F
AERO
06/03
Figure 14.
Equivalent Device Loading for AC Measurements (Includes all Fixtures)
Example System Hold
Time Calculation
To determine the data output hold time in a particular system, first calculate t
DECAY
using
the above equation. Choose
V to be the difference between the TSC21020F
s output
voltage and the input threshold for the device requiring the hold time. A typical
V will be
0.4V. C
L
is the total bus capacitance (per data line), and I
L
is the total leakage or three-
state current (per data line). The hold time will be t
DECAY
plus the minimum disable time
(i.e. t
HDWD
for the write cycle).
Figure 15.
Voltage Reference Levels for AC Measurements (Except Output
Enable/Disable)
Capacitive Loading
Output delays are based on standard capacitive loads: 100 pF on address, select, page
and strobe pins, and 50 pF on all others (see Figure 14). For different loads, these tim-
ing parameters should be derated. See the Hardware Configuration chapter of the
ADSP-21020 User
s Manual from Analog Devices for further information on derating of
timing specifications.
Figures 16 and 17 show how the output rise time varies with capacitance. Figures 18
and 19 show how output delays vary with capacitance. Note that the graphs may not be
linear outside the ranges shown.
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