RM0319 datasheet(302/368 Pages) STMICROELECTRONICS

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Security co-processor (C3)

RM0319

302/368

Doc ID 022640 Rev 3

28.4

Operation

This section outlines the main steps involved in setting up C3 for processing.

●

The host processor creates a program and stores it in memory.

●

The program contains C3 instructions and their arguments (usually pointers to data

buffers in system memory).

●

The host processor writes the base address of the program in the Instruction Pointer

●

Instruction Dispatchers (IDs) work independently from each other and each ID can

handle a C3 instruction flow.

●

From the system/software standpoint, each logical device (associated to an Instruction

Dispatcher) can be managed by an independent software task, which is to say that a

C3 with 4 dispatchers is equivalent to 4 logical co-processors.

●

The selected Instruction Dispatcher starts fetching the program from system memory

and fills its instruction queue. It then process the instruction flow sequentially, one

instruction at a time.

●

The ID either executes the instruction itself (in case of Flow Type instruction) or it

dispatches the instruction to the specified channel (in case of application specific

instruction).

●

The channel executes the instruction

●

The channel generally performs DMA access request for reading input data and

parameters from system memory, but it may be set-up to receive data from another

channel.

●

The channel Core block (CB) performs the actual data processing, which is specific to

the implemented algorithm.

●

The channel generally then performs DMA access request for writing the output data to

system memory, but it may be set-up to send data to another channel too.

●

When the ID hits the end of program it signals completion by rising an interrupt

●

Interrupt generation may be disabled, in which case polling by the host processor of the

C3 status register can be used to determine the end of processing.

28.4.1

Channel ID

Each Channel/Version is assigned a unique 32 bit Identifier that can be read in the Channel

ID register of each channel.

The upper 8 bit of the Channel ID are reserved for specific organizations. In order to

manage the situation in which different versions of the same channel are developed by

different company organizations the organization specific bit indicates which organization is

in charge of maintaining the corresponding version of the channel. In the device, the bit

mask to be used for retrieving this ID is 0x8000_0000.

Table 90.

Channel ID Table

Channel

No.

Channel Name

Function

Type

Channel ID

EMPTY_CNL

No channel

DES_CNL

DES/3DES algorithm (ECB,

CBC modes)

Cryptography

0x00002000

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