Download >>> https://tinurli.com/281uyr
This article will guide you through the different necessary components of the custom USB Mass Storage Class (MSC) device, and provide an overview of how it works. This article comes with other related tutorials, so be sure to check them out, too! Before you can make your own custom USB Mass storage device, you first need to understand the main components. These are: 1. A chip that implements IEEE 1394-1995 compatible specifications. 2. The Unique Device Identifier (UDI). The UDI is a 128 bit number that uniquely identifies each device on mass storage systems compliant with MSC standards. 3. A flash file system. Conventional flash file systems implement the FAT12 or FAT16 filesystems. The Microsoft bootable flash image standard for USB mass storage is known as SFF-2, which imitates the 1.44MB floppy disk filesystem format, but it can also be used to emulate other conventional formats for other purposes. 4. The bootloader specification, which contains all the necessary USB driver code to talk to the chip and media structure that are required by operating systems usually including Linux or Windows to access the media on a device such as a CD/DVD, hard drive or USB mass storage device class device such as a thumb drive. 5. A way to boot, including a boot device driver. This article will focus on the first component, the IEEE 1394-1995 compatible devices. The rest of the components are not required for this tutorial. The Isochronous transfer type is used to transport data at a constant bit rate with minimum latency for real time audio and video applications. It was designed for Isochronous transfer of digital audio or video streams. It provides a way to synchronize application software with the data stream by providing timestamps in each packet header. This allows applications to process packets in order, without having to resynchronize when an out of order packet arrives. Asynchronous transfers are generally used for bulk data transfers. The transfer protocol provides the packer to use this mode for transferring data without any timestamps in the header. The IEEE 1394-1995 standard does not define which packets are type isochronous or asynchronous. Most mass storage devices implement asynchronous transfers by default, so they can be used in both isochronous and asynchronous modes. A host bus adapter (HBA) connects a computer to a storage device through an industry standard connector, such as IEEE 1394 serial bus, SATA, Fibre Channel or SCSI. The host bus adapter includes a chip that implements IEEE 1394-1995 protocols. The chip implementing the IEEE 1394-1995 specification contains a microprocessor, random access memory and registers. The microprocessor is connected to an external bus, such as PCI. It also talks to the major components of the device. In this case it would talk to the flash file system and provide commands that will be used to transfer or access data from the device. The Northbridge is connected to the graphics controller through either an internal PCI bus or directly through a port on the motherboard. cfa1e77820
Comments