0 Preface
At present, USB has been widely used in data acquisition systems. At present, the USB2.0 specification is used more. With the continuous improvement of test and measurement requirements, USB2.0 has gradually become difficult to meet the requirements. The new USB 3.0 specification addresses some of the limitations of USB 2.0 and is ideal for modern test and measurement systems.
1 USB2.0 performance and limitations
Universal Serial Bus (USB) is a widely used system bus, which is widely used in the field of test and measurement. Currently the most widely used is the USB 2.0 standard with a communication rate of up to 480 Mbps. But at the same time, the USB2.0 standard also has the following shortcomings:
1) Half-duplex communication
USB2.0 adopts half-duplex communication, and only one direction of data transmission can be performed at the same time. It is often difficult to meet the requirements in the case where bidirectional high-speed data transmission is required.
2) Need host scheduling
The USB2.0 standard adopts a master-slave structure in transmission scheduling. The computer needs to initiate IN Token or OUT Token first, and the USB device can perform data transmission. After a data transmission is completed, it must wait for the next token, which greatly restricts the real-time data transmission. Sex.
3) Communication rate is not high compared to competitors
USB competitors include 1394 and eSATA. The newer 1394b standard data transmission speed reaches 800Mbps, almost double the USB2.0 HS. And eSATA data transfer speed is higher.
2 USB3.0SS (SuperSpeed) standard introduction
To enhance the performance and competitiveness of USB, the USB Alliance has introduced a new USB 3.0SS (SuperSpeed) standard. The standard uses two differential links for full-duplex communication at speeds up to 5.0Gps, which is not only higher than the 1394b standard, but also competitive with eSATA.
USB3.0 adds 2 pairs of differential links based on 2.0, which is specially used to transmit SS differential signals. The mechanical characteristics of the host-side interface are compatible with USB 2.0, while the device side uses a new interface form to accommodate the addition of two pairs of differential signal lines. The B-type connector of the USB2.0 interface can be plugged into the device side of the USB3.0. At this time, the device works in the USB2.0 mode; however, the USB-type B-type connector cannot be inserted into the USB2.0 device.
In addition, USB3.0's bus power supply capacity is 1A, making it suitable for power-hungry devices such as mobile hard drives without the need for an external power supply.
3 CYUSB3014 chip introduction
The CYUSB3014 is a USB 3.0 controller from Cypress, the leader in the USB industry. The controller integrates a 200MHz ARM9 controller, 512K bytes of RAM and a USB 3.0 physical layer with a programmable 100MHz GPIF II interface.
Figure 1 is a logic block diagram of the chip. The chip can be used in many fields such as digital cameras, data acquisition, test and measurement equipment.
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