Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
Chris.Loberg
User Rank
Blogger
Re: "C" does not stand for Camera
Chris.Loberg   9/2/2014 3:14:33 PM
NO RATINGS
Thank you Joe. For clarifying the "C" in CPHY. I was guessing on the naming convention given the heavy focus on CSI/DSI support in this revision to DPHY. I agree with you that CPHY offers great promise to increasing DPHY throughput without hanging more symbol-based overhead on.

JoeS37
User Rank
Rookie
"C" does not stand for Camera
JoeS37   9/2/2014 12:25:12 PM
NO RATINGS
And if it did, what would "M" in M-phy stand for?

Truth is, these letters are related to symbol rates in MHz - they are Roman numerals!.

D = 500.  the first D-PHY spec in 2009 said HS speed was intended to be 80 to 1000Mb/s. The upper limit has since been raised.

M = 1000. The first HS Gear was 1.248Gb/s (HS-G1A) or 1.4576Gb/s (HS-G1B).  Later specs added HS-G2 and HS-G3  (and stay tuned for HS-G4).

C = 100.  C-PHY is derived from D-PHY (except it doesn't forward a clock, it is embedded) but since it transfers 2.28 bits per symbol the symbol rate for the same data transmission rate can be less than half as much as D-PHY would need.  According to the latest draft C-PHY spec it is "intended to define a solution for a symbol rate range of 80 to 2500 Msps per lane, which is the equivalent of about 182.8 to 5714 Mbps per lane."

It is interesting to note that C-PHY balances the current in 3 wires, does not need an extra pair of wires for clock, and achieves speeds up to M-PHY's HS-G3 but at a symbol rate 1/2.28 of M-PHY's bit rate.  It reuses D-PHY's low speed mode ... I think in some cases C-PHY could be viewed as a substantial improvement over real D-PHY.



Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
<b><a href=Betajet">

The Circle – The Future's Imperfect in the Present Tense
Betajet
5 comments
The Circle, a satirical, dystopian novel published in 2013 by San Francisco-based writer Dave Eggers, is about a large, very powerful technology company that combines aspects of Google, ...

Max Maxfield

Recommended Reads From the Engineer's Bookshelf
Max Maxfield
27 comments
I'm not sure if I read more than most folks or not, but I do I know that I spend quite a lot of time reading. I hate to be idle, so I always have a book or two somewhere about my person -- ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...