DXP technology and Dragon Core 3A machine

time is running so fast! To the company has been more than half a month! The thought of a daily stroke, but repeatedly delayed, until today to write. All right, no more nonsense. Write some of the things you do these days. Let's have a reason. Also hope that we supervise, due to the level of limited, there is not the right place, also look correct!

The first thing to do is to make a circuit board diagram. Using the DXP 2004. One of the drawings is a motherboard diagram of the FPGA. It took a whole week. It's a sort of a. I spent the layout and wiring. Before the PCB import was done by other colleagues in the company. At first, that was uncomfortable. Hell, even though I used to paint in school, I've learned a little bit about the software. But when you get this picture. was blindfolded. Do not know how to do, and later with the help of colleagues to complete the job. Some of the knowledge of DXP is now summarized below. Hehe, can not be called summary, that is, some knowledge points to a reason

PCB Design Flow: Drawing schematic-Import schematic-Setup rules-layout-cabling-DRC inspection-Copper-DRC inspection

layout : 1. Component layout and cabling is very time-consuming. In general, if the board to be installed on the chassis, it means that there are many connectors on the PCB board. Therefore, the preferred location and orientation of the connector should be fixed first. Then lock the device.

2. After the connector position is fixed, then determine the location of the master device, such as CPLD, FPGA, godson 33 a device position. Let's think about it. Most external devices are connected to the MCU. So this is important.

3. Some big chips don't know when to put that place. You figure out what this chip is for. Input, the output of what, the chip itself connection diagram in the Manual check. General Board on the power supply circuit, the power chip put together. Keep distance from other devices

4. In short, a word. Device layout, first understand the device, chip function, first roughly determine the location, to the later wiring, then transferred to. Objective point, the layout conforms to the electrical characteristics, beautiful, convenient welding.

cabling : 1. Wiring is the same as drawing, drawing lines, it is so simple, casually even. How to learn how to practice. No technical content. Casual practice, but there are some tricks.

2. Signal line, ground, power cord. The total comes to these three kinds of lines. Order: Connect the signal line, power line, ground wire first.

3. Signal line, first connect a direction of the line. That is the bus. Even before the drop planning, from which to go, whether to live other lines, ground, power lines how to go. Shift + dots/vias/pads available. Highlight to see how the line is going.

4. Check the signal, side by step, the crystal vibration is not allowed to follow the line, the general between the pads do not directly connected;

Note: The screen printing layer device name must be sorted well! Post-welding and commissioning. Otherwise, the problem is handled, and debugging is not jumping out. was blindfolded.

The second thing: the Installed box, in fact, is a godson 3 a motherboard and FPGA, the power of an assembly. Fool-like, who will, some of the details summarized as follows:

1. The welding must be firm, voltmeter Test, and immediately after the glue gun with glue fixed.

2. Connect all the device lines, and in the case of the chassis, the motherboard must be taken down carefully. Prevent it from being broken. Mat Cardboard.

3. No metal is allowed in the chassis. For example, accidentally falling into a spiral to prevent a short circuit.

4. Install the test after testing, various interfaces. For example, the network port, RS232 serial port, 15-pin VGA interface test. Test to check whether the function is normal, there are many methods of testing.

(1). RS232 serial Debugging Assistant test: There is a display, the serial read function is normal, after the system up, input commands, check whether the write is normal, note: With serial serial Assistant is, must be the flow control before the tick removed, otherwise, the serial port can not be written.

(2). Network port test: To find a network cable, in the serial debugging assistant Ping whether the net pass. If a motherboard has 2, 4 network ports, then its IP should be located in different network segments, for example: Ifconfig em0 192.168.1.25 The other one is located in the 192.168.2.25

(3). VGA video Communication interface test: Directly unplug the computer main box VGA cable, access. The display shows that the VGA interface is normal. The VGA interface has 15 feet generally 7 wires access. VGA 15-pin D-type, male , 1,2,3,10,13,14,15 access.

DXP technology and Dragon Core 3A machine