CFexpress is a standard for removable storage devices proposed by the CompactFlash Association . The standard allows you to use the PCIe bus version 3.0 with a width of 1 to 8 lines, with data transfer speeds of 1 gigabyte per second on each line. The NVMe protocol is used to provide low latency and reduce overhead. There are several CFX form factors that have varying numbers of PCIe lanes in a slot. [1] One of the goals of the standard is to unify the removable media ecosystem and use the widely used PCIe and NVMe standards. There is a wide range of controllers, drivers, and drives that use these standards.
Content
History
The CFexpress specification was announced by the CFA on September 7, 2016. The specification is based on the PCI-Express interface and the NVM express protocol.
On April 18, 2017, the CompactFlash Association published the CFexpress 1.0 specification. [2] Version 1.0 will use the XQD card form factor (38.5 mm × 29.8 mm × 3.8 mm), providing two PCIe 3.0 lanes with a total speed of up to 2 GB / s. The NVMe protocol version 1.2 is used for low latency, low overhead and high access concurrency.
Comparison
| Standard | SD cards | UFS cards | CFast Cards | Xqd | CFexpress | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Version | 3.0 | 4.0 | 6.0 | 7.0 [3] | 1.0 | 2.0 | 1.0 | 2.0 | 1.0 | 2.0 | 1.0 | ? |
| Launched | 2010 2Q | 2011 1st quarter | 2017 1st quarter | ? | Q2 2016 | ? | 2008 B3 | 2012 V3 | Q4 2011 | 2014 1st quarter | 2017 K2 | ? |
| Tire | UHS-I | UHS-II | UHS-III | PCIe slot | UFS 2.0 | UFS 3.0 | SATA-300 | SATA-600 | PCIe 2.0 x1 | PCIe 2.0 x2 | PCIe 3.0 x2 | PCIe 3.0 x8 |
| Speed, MB / s (full duplex) | 104 | 156 | 624 | 985 | 600 | 1200 | 300 | 600 | 500 | 1000 | 1970 | 7880 |
Compatible Devices
Maps
On June 13, 2017, Delkin introduced the first CFexpress cards based on the CFexpress 1.0 specification. [4] The cards are made in the XQD form factor and use two PCIe 3.0 lanes. The volume of drives - 32 GB, 64 GB, 128 GB and 256 GB, an increase in capacity is expected to 1 TB in the future.
Readers
On August 16, 2017, Atech Flash announced the first CFexpress card reader. Blackjet VX-1CXQ supports XQD (500 MB / s) and CFexpress (2 GB / s) cards and uses the Thunderbolt 3 interface to connect to a PC. The availability of the device is expected on December 1, 2017. [5]
Components
On October 2, 2017, Rego Electronics introduced the components - the CFexpress host connector and card cases. [6] [7] [8]
See also
- CompactFlash memory cards
- Memory cards
- PCI express
- NVM express
Notes
- ↑ CFA 5.1 Press Release .
- ↑ CFexpress 1.0 Press Release .
- ↑ Pinto, Yosi SD + PCIe / NVMe card New Innovations in SD Cards Lead the Way to Mobile Everything . Flash Memory Summit .
- ↑ Industrial CFexpress 1.0 and Industrial CFX 1.0 Cards (English) , Delkin Industrial .
- ↑ Atechflash Blackjet VX-1CXQ unopened (link not available) . atechflash . Date of treatment December 11, 2017. Archived on October 9, 2017.
- ↑ REGO ELECTRONICS News - CFexpress Card Connectors & Card kits . www.rego.com.tw. Date of treatment October 9, 2017.
- ↑ REGO ELECTRONICS Card Host Connectors . www.rego.com.tw. Date of treatment October 9, 2017.
- ↑ REGO ELECTRONICS CFexpress Card Cardkits . www.rego.com.tw. Date of treatment October 9, 2017.