Engineering:InterChip USB
InterChip USB (IC-USB), sometimes referred to as USB-IC or Inter-chip USB, is an addendum to the USB Implementers Forum (USB-IF) USB 2.0 specification. IC-USB is intended as a low-power variant of the standard physical USB interface, intended for direct chip-to-chip communications. The IC-USB bus's maximum length of 10 cm results in a lower inductance and capacitance and therefore allows lower power requirements. IC-USB is used primarily in embedded systems; for example, ETSI (in specification TS 102 600)[1] has standardized on IC-USB as the official high-speed interface for connections between the main chipset of a smartphone and the SIM card or UICC card.
High-Speed Inter-Chip (HSIC) is a chip-to-chip variant of USB 2.0 that eliminates the conventional analog transceivers found in normal USB. It was adopted as a standard by the USB-IF in 2007. The HSIC physical layer uses about 50% less power and 75% less board area compared to traditional USB 2.0. HSIC uses two signals at 1.2 V and has a throughput of 480 Mbit/s. Maximum PCB trace length for HSIC is 10 cm. It does not have low enough latency to support RAM sharing between two chips.[2][3]
SuperSpeed Inter-Chip (SSIC) is the USB 3.0 successor of HSIC.[4]
The USB-IF Inter-Chip USB Supplement was released in March 2006. ETSI TS 102 600,[1] which is ETSI's USB implementation requirements specification, was first released in December 2007.
References
- ↑ 1.0 1.1 "ETSI TS 102 600 v10.1.0: Smart Cards; UICC-Terminal interface; Characteristics of the USB interface (Release 10)" (PDF). September 2020. https://www.etsi.org/deliver/etsi_ts/102600_102699/102600/10.01.00_60/ts_102600v100100p.pdf. Retrieved October 7, 2021.
- ↑ "Interchip Connectivity: HSIC, UniPro, HSI, C2C, LLI... oh my!". Archived from the original on June 19, 2011. https://web.archive.org/web/20110619022557/http://info.arteris.com/blog/bid/59433/Interchip-Connectivity-HSIC-UniPro-HSI-C2C-LLI-oh-my. Retrieved June 24, 2011.
- ↑ "USB High Speed Inter-Chip Interface". Archived from the original on June 9, 2011. https://web.archive.org/web/20110609163812/http://www.interfacebus.com/hsic-bus-high-speed-inter-chip-usb.html. Retrieved June 24, 2011.
- ↑ "Transitioning from USB 2.0 HSIC to USB 3.0 SSIC". Archived from the original on October 7, 2015. https://web.archive.org/web/20151007072152/http://www.synopsys.com/Company/Publications/DWTB/Pages/dwtb-transitioning-usb-jan2013.aspx. Retrieved August 7, 2015.
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