RM0319 datasheet(300/368 Pages) STMICROELECTRONICS

300 / 368 page

Security co-processor (C3)

RM0319

300/368

Doc ID 022640 Rev 3

C3 has two interfaces:

●

AHB Master Interface: it is used to fetch instruction flows, to access input data,

parameters and to store output data to system memory.

●

AHB Slave Interface: it is used to set-up the device and to access all the registers.

C3 has been designed to perform acceleration of data-intensive applications where

computationally expensive algorithms must operate on medium to large memory buffers.

Such applications can be found in the fields of security (data encryption, integrity check,

etc.) and networking.

There are many other fields of application for C3, such as signal processing, image

processing and in general applications that require complex mathematical computations

28.3.1

HIF (High speed bus interface)

This block implements an AMBA AHB 2.0 compliant Master interface. It receives internal

requests from all the C3 internal initiator blocks and it translates them into AHB bus

requests. The HIF is a master only and will not allow access to the C3 internal.

28.3.2

SIF (Slave bus interface)

This block implements an AMBA AHB 2.0 compliant Slave interface. This interface is used to

set-up the device and access all the memory mapped internal registers. Each channel is

allocated a 1K byte address space and the major blocks of the C3 are also allocated space

in the map.

28.3.3

IDS (Instruction dispatchers sub-system)

This block contains the instruction dispatchers (up to 4) that are in charge of fetching the

programs from memory and dispatch the instructions to the requested channels. Since the

instruction dispatchers operate in parallel up to 4 instruction flows can be executed

concurrently.

If programmed to do so the instruction dispatcher signal the end of processing to the host

processor by raising an interrupt signal.

Each Instruction Dispatchers (ID) can handle two types of instructions:

●

Flow Type Instructions: these are C3 control instructions and are executed by the ID

itself

●

Application Specific Instructions: these are processing instructions that are directly

dispatched by the ID to the right channel that will perform decoding and execution.

28.3.4

Channel

A Channel is a specific function or set of similar functions and a wrapper to provide data flow

management, instruction handling and interface to the various parts of C3. Channels

implement the data processing. Total number of channels available in this version of C3 is 3.

Channels operate in parallel and contend the access to the system bus through the HIF

arbitration mechanism. Channels are designed to efficiently support the data-flow model of

computation.

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