Product manual

Spinpoint M9TU-USB 3.0 Product Manual REV 1.0

USB INTERFACE AND USB COMMANDS

6.2.1.3 Cable

USB cable consists of four conductors, two power conductors, and two signal conductors. High-/full-speed

cable consists of a signaling twisted pair, V

BUS, GND, and an overall shield. High-/full speed cable must be

marked to indicate suitability for USB usage. High-/full-speed cable may be used with either low-speed, full-

speed, or high-speed devices. When high-/full-speed cable is used with low-speed devices, the cable must meet

all low-speed requirements. Low-speed recommends, but does not require the use of a cable with twisted

signaling conductors.

6.2.1.4 Cable Assembly

This chapter describes three USB cable assemblies: standard detachable cable, high-/full-speed

captive cable, and low-speed captive cable.

A standard detachable cable is a high-/full-speed cable that is terminated on one end with a Series “A” plug and

terminated on the opposite end with a series “B” plug. A high-/full-speed captive cable is terminated on one end

with a Series “A” plug and has a vendor-specific connect means (hardwired or custom detachable) on the

opposite end for the high-/full-speed peripheral. The low-speed captive cable is terminated on one end with a

Series “A” plug and has a vendor-specific connect means (hardwired or custom detachable) on the opposite end

for the low-speed peripheral. Any other cable assemblies are prohibited.

6.2.1.4.1 Standard Detachable Cable Assemblies

High-speed and full-speed devices can utilize the “B” connector. This allows the device to have a standard

detachable USB cable. This eliminates the need to build the device with a hardwired cable and minimizes

end user problems if cable replacement is necessary.

Devices utilizing the “B” connector must be designed to work with worst case maximum length detachable

cable. Standard detachable cable assemblies may be used only on high-speed and full-speed devices. Using a

high-/full-speed standard detachable cable on a low-speed device may exceed the maximum low speed cable

length. Figure 6-7 illustrates a standard detachable cable assembly.

Figure 6-7: USB Standard Detachable Cable Assembly