Dell Latitude 3400 Service Manual - Page 8
USB features, Memory Errors, USB 3.0/USB 3.1 Gen 1 SuperSpeed USB - drivers
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Curved edge DDR4 modules feature a curved edge to help with insertion and alleviate stress on the PCB during memory installation. Figure 3. Curved edge Memory Errors Memory errors on the system display the new ON-FLASH-FLASH or ON-FLASH-ON failure code. If all memory fails, the LCD does not turn on. Troubleshoot for possible memory failure by trying known good memory modules in the memory connectors on the bottom of the system or under the keyboard, as in some portable systems. NOTE: The DDR4 memory is imbedded in board and not a replaceable DIMM as shown and referred. USB features Universal Serial Bus, or USB, was introduced in 1996. It dramatically simplified the connection between host computers and peripheral devices like mice, keyboards, external drivers, and printers. Table 1. USB evolution Type USB 2.0 Data Transfer Rate 480 Mbps Category High Speed Introduction Year 2000 USB 3.0/USB 3.1 Gen 1 5 Gbps SuperSpeed 2010 USB 3.1 Gen 2 10 Gbps SuperSpeed 2013 USB 3.0/USB 3.1 Gen 1 (SuperSpeed USB) For years, the USB 2.0 has been firmly entrenched as the de facto interface standard in the PC world with about 6 billion devices sold, and yet the need for more speed grows by ever faster computing hardware and ever greater bandwidth demands. The USB 3.0/USB 3.1 Gen 1 finally has the answer to the consumers' demands with a theoretically 10 times faster than its predecessor. In a nutshell, USB 3.1 Gen 1 features are as follows: • Higher transfer rates (up to 5 Gbps) • Increased maximum bus power and increased device current draw to better accommodate power-hungry devices • New power management features • Full-duplex data transfers and support for new transfer types • Backward USB 2.0 compatibility • New connectors and cable The topics below cover some of the most commonly asked questions regarding USB 3.0/USB 3.1 Gen 1. 8 Technology and components