trigonometry

trigonometry: 三角学

long lines in spice

All file lines must start in the first (left-most) column. When a line is too long to fit, break the line and use the + symbol as the first character of the extension line.
(The maximum length of a line is 132 Characters)

Bluetooth Setup in Ubuntu

https://help.ubuntu.com/community/BluetoothSetup

for me, whenever I want to connect my cordless mouse, do the following two steps:
1. sudo /etc/init.d/bluetooth restart
2. sudo hidd --search

get the system properties in matlab

For example, we have a state space system called "demo", in order to get the A, B, C, D matrices of that system, there are two ways:

1. get(demo, 'A'), get(demo, 'B')...get(demo,'D')
2. demo.A, demo.B, demo.C, demo.D

simulation when lpm_ram_dq is used

When lpm_ram_dq is used to create memory, the simulation provided by Quartus II doesn't work any more.

high impedance in vhdl

Although vhdl is case insensitive, when it comes to high impedance, "Z" must be used instead of "z".

microcomputer design

load: 1,3
-- load register 3 with the memory data whose address is stored in register 1.

store: 2,4
-- put the data stored in register 2 into the memory address stored in register 4.

brgtI: 1,7, 58
-- branch to memory 58 if data stored in register 1 is greater that register 7.