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ADSP-BF609BBCZ-5 Datasheet(PDF) 5 Page - Analog Devices

No. de pieza ADSP-BF609BBCZ-5
Descripción Electrónicos  Blackfin Dual Core Embedded Processor
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ADSP-BF609BBCZ-5 Datasheet(HTML) 5 Page - Analog Devices

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Rev. 0
|
Page 5 of 112
|
June 2013
ADSP-BF606/ADSP-BF607/ADSP-BF608/ADSP-BF609
a very small final memory size. The instruction set also provides
fully featured multifunction instructions that allow the pro-
grammer to use many of the processor core resources in a single
instruction. Coupled with many features more often seen on
microcontrollers, this instruction set is very efficient when com-
piling C and C++ source code. In addition, the architecture
supports both user (algorithm/application code) and supervisor
(O/S kernel, device drivers, debuggers, ISRs) modes of opera-
tion, allowing multiple levels of access to core 
processor resources.
The assembly language, which takes advantage of the proces-
sor’s unique architecture, offers the following advantages:
• Seamlessly integrated DSP/MCU features are optimized for
both 8-bit and 16-bit operations.
• A multi-issue load/store modified-Harvard architecture,
which supports two 16-bit MAC or four 8-bit ALU + two
load/store + two pointer updates per cycle.
• All registers, I/O, and memory are mapped into a unified
4G byte memory space, providing a simplified program-
ming model.
• Control of all asynchronous and synchronous events to the
processor is handled by two subsystems: the Core Event
Controller (CEC) and the System Event Controller (SEC).
• Microcontroller features, such as arbitrary bit and bit-field
manipulation, insertion, and extraction; integer operations
on 8-, 16-, and 32-bit data-types; and separate user and
supervisor stack pointers.
• Code density enhancements, which include intermixing of
16-bit and 32-bit instructions (no mode switching, no code
segregation). Frequently used instructions are encoded
in 16 bits.
PROCESSOR INFRASTRUCTURE
The following sections provide information on the primary
infrastructure components of the ADSP-BF609 processor.
DMA Controllers
The processor uses Direct Memory Access (DMA) to transfer
data within memory spaces or between a memory space and a
peripheral. The processor can specify data transfer operations
and return to normal processing while the fully integrated DMA
controller carries out the data transfers independent of proces-
sor activity.
DMA transfers can occur between memory and a peripheral or
between one memory and another memory. Each Memory-to-
memory DMA stream uses two channels, where one channel is
the source channel, and the second is the destination channel.
All DMAs can transport data to and from all on-chip and off-
chip memories. Programs can use two types of DMA transfers,
descriptor-based or register-based. Register-based DMA allows
the processor to directly program DMA control registers to ini-
tiate a DMA transfer. On completion, the control registers may
be automatically updated with their original setup values for
continuous transfer. Descriptor-based DMA transfers require a
set of parameters stored within memory to initiate a DMA
sequence. Descriptor-based DMA transfers allow multiple
DMA sequences to be chained together and a DMA channel can
be programmed to automatically set up and start another DMA
transfer after the current sequence completes.
The DMA controller supports the following DMA operations.
• A single linear buffer that stops on completion.
• A linear buffer with negative, positive or zero stride length.
• A circular, auto-refreshing buffer that interrupts when each
buffer becomes full.
• A similar buffer that interrupts on fractional buffers (for
example, 1/2, 1/4).
• 1D DMA – uses a set of identical ping-pong buffers defined
by a linked ring of two-word descriptor sets, each contain-
ing a link pointer and an address.
• 1D DMA – uses a linked list of 4 word descriptor sets con-
taining a link pointer, an address, a length, and a
configuration.
• 2D DMA – uses an array of one-word descriptor sets, spec-
ifying only the base DMA address.
• 2D DMA – uses a linked list of multi-word descriptor sets,
specifying everything.
CRC Protection
The two CRC protection modules allow system software to peri-
odically calculate the signature of code and/or data in memory,
the content of memory-mapped registers, or communication
message objects. Dedicated hardware circuitry compares the
signature with pre calculated values and triggers appropriate
fault events.
For example, every 100 ms the system software might initiate
the signature calculation of the entire memory contents and
compare these contents with expected, pre calculated values. If a
mismatch occurs, a fault condition can be generated (via the
processor core or the trigger routing unit).
The CRC is a hardware module based on a CRC32 engine that
computes the CRC value of the 32-bit data words presented to
it. Data is provided by the source channel of the memory-to-
memory DMA (in memory scan mode) and is optionally for-
warded to the destination channel (memory transfer mode).
The main features of the CRC peripheral are:
•Memory scan mode
•Memory transfer mode
•Data verify mode
• Data fill mode
• User-programmable CRC32 polynomial
• Bit/byte mirroring option (endianness)
• Fault/error interrupt mechanisms
• 1D and 2D fill block to initialize array with constants.
• 32-bit CRC signature of a block of a memory or MMR
block.


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