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Version 1.01.00 r0.04 2-Apr-2009 DRAFT MIPI Alliance Specification for CSI-2
Copyright © 2005-2009 MIPI Alliance, Inc. All rights reserved.
MIPI Alliance Member Confidential.
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2 Terminology 386
The MIPI Alliance has adopted Section 13.1 of the IEEE Standards Style Manual, which dictates use of the 387
words “shall”, “should”, “may”, and “can” in the development of documentation, as follows: 388
The word shall is used to indicate mandatory requirements strictly to be followed in order 389
to conform to the standard and from which no deviation is permitted (shall equals is 390
required to). 391
The use of the word must is deprecated and shall not be used when stating mandatory 392
requirements; must is used only to describe unavoidable situations. 393
The use of the word will is deprecated and shall not be used when stating mandatory 394
requirements; will is only used in statements of fact. 395
The word should is used to indicate that among several possibilities one is recommended 396
as particularly suitable, without mentioning or excluding others; or that a certain course 397
of action is preferred but not necessarily required; or that (in the negative form) a certain 398
course of action is deprecated but not prohibited (should equals is recommended that). 399
The word may is used to indicate a course of action permissible within the limits of the 400
standard (may equals is permitted). 401
The word can is used for statements of possibility and capability, whether material, 402
physical, or causal (can equals is able to). 403
All sections are normative, unless they are explicitly indicated to be informative. 404
2.1 Definitions 405
Lane: A differential conductor pair, used for data transmission. For CSI-2 a data Lane is unidirectional. 406
Packet: A group of two or more bytes organized in a specified way to transfer data across the interface. All 407
packets have a minimum specified set of components. The byte is the fundamental unit of data from which 408
packets are made. 409
Payload: Application data only – with all sync, header, ECC and checksum and other protocol-related 410
information removed. This is the “core” of transmissions between application processor and peripheral. 411
Sleep Mode: Sleep mode (SLM) is a leakage level only power consumption mode. 412
Transmission: The time during which high-speed serial data is actively traversing the bus. A transmission 413
is comprised of one or more packets. A transmission is bounded by SoT (Start of Transmission) and EoT 414
(End of Transmission) at beginning and end, respectively. 415
Virtual Channel: Multiple independent data streams for up to four peripherals are supported by this 416
specification. The data stream for each peripheral is a Virtual Channel. These data streams may be 417
interleaved and sent as sequential packets, with each packet dedicated to a particular peripheral or channel. 418
Packet protocol includes information that links each packet to its intended peripheral. 419