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32.5.13.3 User CSEc command interface and command set
The following sections will describe the SHE compliant commands implemented in the
CSEc command set, The command interface, data structure and protocol related to all
operations.
The commands follow a similar protocol to the CCOB commands in that once a
command has started the CCOB interface will be locked and no further commands may
be initiated until completion of the ongoing command.
This results in one SHE command (CMD_CANCEL) not being implemented in the CSE
command feature set of this module. Also, the CMD_STATUS isn’t strictly supported as
we may not interrupt an ongoing command. But the intent of the CMD_STATUS
command is met by a user accessible status (FCSESTAT) register
All cryptographic functions are processed by an AES-128 engine. Encryption and
decryption of data are supported by Electronic Cipher Book (ECB) mode for single
blocks (128-bits) of data, and by Cipher Block Chaining (CBC) mode for Integer
Multiples of 128-bit block sized data.
Cipher-based Message Authentication Code (CMAC) generation and verification is also
supported by the AES-128 engine, in addition with use of Miyaguchi-Prenell
compression function.
Usage of (most of) the CSEc command set is constructed by writing the data (plain text
or cipher text) to the CSE_PRAM followed by writing the command word to the
CSE_PRAM at address offsets as specified below. The act of writing the ‘Command
Header’ word to the CSE_PRAM will trigger the CCOB interface to be locked down and
the command operation execution to start.
NOTE
1. The usage model requires writing the CSE_PRAM data
contents BEFORE writing the command header contents.
Write the Command Header LAST!
2. Writes to any Byte (bytes 0-3) in the Command Header will
lock out the interface.
3. In general, commands that start with Byte[2] of the
Command Header (continue) but is the first call to that
command, will result in a Sequence Error
(ERC_SEQUENCE_ERROR).
4. For continued commands (Command Header Byte[2]
=0x01) will ignore any data changes in Byte[1] (data type),
Byte[3] (key slot) and any MESSAGE_LENGTH,
Functional description
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
784
NXP Semiconductors
Summary of Contents for MWCT101 S Series
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Page 50: ...Conventions MWCT101xS Series Reference Manual Rev 3 07 2019 50 NXP Semiconductors...
Page 70: ...Aliased bit band regions MWCT101xS Series Reference Manual Rev 3 07 2019 70 NXP Semiconductors...
Page 78: ...Pinout diagrams MWCT101xS Series Reference Manual Rev 3 07 2019 78 NXP Semiconductors...
Page 96: ...WCT101xS safety concept MWCT101xS Series Reference Manual Rev 3 07 2019 96 NXP Semiconductors...
Page 130: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 130 NXP Semiconductors...
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Page 430: ...Functional Description MWCT101xS Series Reference Manual Rev 3 07 2019 430 NXP Semiconductors...
Page 472: ...Application Information MWCT101xS Series Reference Manual Rev 3 07 2019 472 NXP Semiconductors...
Page 528: ...Module clocks MWCT101xS Series Reference Manual Rev 3 07 2019 528 NXP Semiconductors...
Page 634: ...SRAM configuration MWCT101xS Series Reference Manual Rev 3 07 2019 634 NXP Semiconductors...
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Page 992: ...ADC calibration scheme MWCT101xS Series Reference Manual Rev 3 07 2019 992 NXP Semiconductors...
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Page 1726: ...Debug and security MWCT101xS Series Reference Manual Rev 3 07 2019 1726 NXP Semiconductors...
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