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Arasan Chip Systems, Inc.
Short Desc. :
UHS-II PHY IP Core
The rapid proliferation of high-performance mobile and handheld devices has resulted in increasing requirements for non-volatile memory. Memory interfaces with larger capacities and faster access times are needed. In response to these trends, SD 4.0 (UHS-II or UHS-ii) achieves a peak interface speed of 3.12Gb/s. Arasan’ UHS-II PHY is compliant with the draft specification of UHS-II and is an extremely area and power efficient implementation. This interface is backward compatible with legacy SD cards. Both Host and Device UHS-II PHY configurations are available.
The UHS-II PHY IP is a comprehensive, silicon-proven configurable core that has been ported to multiple process nodes and leading foundries. It uses sub-LVDS signaling consisting of one pair each for transmit, receive and an additional reference clock. This low-pin interface has reduced power consumption and low EMI. To further reduce power, the reference clock operates at 1/15 or 1/30 of the data transfer speed. This differential clock operates between 26MHz to 52MHz and is carried over the legacy SD lines DAT0, DAT1.
Arasan’s UHS-II PHY operates in both the Full-duplex and Half-duplex modes. It includes a 8b/10b encoder/decoder. The controller side interface of the UHS-II PHY operates in the range from 39MB/s to 156MB/s. The default data lane D0 is used for downstream connection and the D1 lane is used for the other direction. An 8b/10b coding scheme is used. To improve testability, the UHS-II PHY implements the standard loopback paths.
- Compliant to SD Specifications Part 1 UHS-II Specification Volume 2: PHY* and SD Specifications Part 1 UHS II Specification Volume 1: System and Protocol”
- Per lane data rate between 390Mb/s to 1.56Gb/s
- Supports peak interface speed of 3.12Gb/s (Half-duplex); 1.56Gb/s in Full-duplex mode
- Sub-LVDS Differential PHY signaling
- Low frequency differential reference clock (1/15 or 1/30) of data rate
- Supports Spread Spectrum clocking to reduce EMI
- Flexible transmission rates from 390Mb/s – 1.56Gb/s (each lane)
- Multiple power saving modes: Dormant, Line standby
- Low power, reduced EMI operation
- Integrated solution with built-in termination, no external components
- Easily ported to various process nodes and foundries
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