PCIe flash card

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PCIe flash card

Flash card is a memory that uses flash memory technology to store electronic information. It is generally used as a storage medium in small digital products such as digital cameras, PDAs, MP3, etc., so it looks small, like a card, so it is called flash card PCI Express is the latest bus and interface standard. Its original name is "3gio". PCIe belongs to high-speed serial point-to-point dual channel high bandwidth transmission. The connected devices are allocated with exclusive channel bandwidth and do not share resources. It mainly supports active power management, error reporting, end-to-end reliability transmission, [7] hot plug and quality of service (QoS) and other functions Yes.

The principle is based on NAND flash memory. The basic memory unit of memory and NOR flash memory is bit. Users can access any bit information at random. The basic storage unit of NAND flash memory is page (you can see that the page of NAND flash memory is similar to the sector of hard disk, and one sector of hard disk is 512 bytes). The effective capacity of each page is a multiple of 512 bytes. The so-called effective capacity refers to the part used for data storage, in fact, 16 bytes of verification information should be added, so we can see the expression of "(512 + 16) byte" in the technical data of flash memory manufacturers. The vast majority of NAND flash memory with capacity below 2GB is (512 + 16) bytes of page capacity, while NAND flash memory with capacity above 2GB expands the page capacity to (2048 + 64) bytes.

After pci-sig (PCI special interest organization) certification and release, PCIe was renamed "PCI Express" or "PCI-E" for short. This new standard will replace the current PCI and AGP, and finally realize the unification of bus standard. It is mainly used in SSD (solid-state drive) of servers. There are many suppliers of PCIe flash cards, such as ibm-tms, Intel, LSI, OCZ, Samsung (in plan), SanDisk, STEC, SuperTalent and Toshiba (in plan). The products produced by LSI are the most outstanding, with the best quality and performance. At present, the latest version is PCI-E 3.0, and there are PCI-E (i.e. version 1.0) that has not been delisted. 2.0 doubles the bandwidth of 1.0, while 3.0 doubles the bandwidth of 2.0, which is 5GHz x 4. PCI Express 2.0 specification has made a major upgrade in data transmission speed, that is, from the previous 2.5Gbps bus frequency doubling to 5.0gbps, which means that the previous PCI Express 2.0x16 interface can double to an amazing 10Gb / s bus bandwidth (1GB / S = 8gbps)