CS7410-CM Cirrus Logic, CS7410-CM Datasheet - Page 23

• Manufacturer Part Number: CS7410-CM
• Description: CD/MP3/WMA Audio Controller
• Manufacturer: Cirrus Logic

3. FUNCTIONAL DESCRIPTION
3.1
The CS7410 includes a powerful, proprietary 32-
bit RISC processor backed by powerful software
development tools. The RISC-32 has a MAC en-
gine which performs multiply/accumulate in 2 cy-
cles with C support, effectively achieving single
cycle throughput.
There are other instructions that are designed to
help with performing audio decoding. The RISC
processor coordinates on-chip multi-threaded
tasks, as well as supervises system activities such
as keypad and front panel display control.
3.2
The CS7410 contains a proprietary digital signal
processor (DSP) called DSP-16, which is opti-
mized for audio and sound applications. In the
CS7410, the DSP-16 assists with audio decoding
and provides added functions such as surround
sound and equalization. The DSP performs 16-bit
simple integer operations, and has a 16-bit fixed
point logic unit with a 32-bit accumulator.
There are 24 general-purpose registers, and eight
independent address generation registers, featur-
ing: post-increment ALU, linear and circular buffer
operations, bit reverse ALU operations, and dual
operand read from memory. The multiply-accumu-
lator has single-cycle throughput, with two cycle
latency. The DSP is optimized for bit packing and
unpacking operations. The interface to main mem-
ory is designed for bursting flexible block sizes and
skip counts.
3.3
The Memory Controller performs the arbitration
functions for all the other modules in the CS7410,
allowing access to internal ROM and SRAM, and
to external ROM and DRAM. The Memory Con-
troller services and arbitrates a number of clients
and stores their code and/or data within the local
DS553PP1
RISC-32 Processor
DSP-16 Processor
Memory Control
memory. This arbitration and scheduling guaran-
tees the allocation of sufficient bandwidth to the
various clients. An optimal application will use
only internal ROM and SRAM for code and data
storage, which results in the best timing and lowest
power consumption.
External DRAM may be used for runtime code
storage or for ESP RAM. In both of these applica-
tions, the data throughput requirement is low, and
the Memory Controller acts as a DMA engine to
move data between external and internal memory
with minimal power consumption. The internal
ROM contains most of the code required for audio
decoding and system functions.
Additional code can be stored in external ROM
(managed by the Memory Controller) or a small se-
rial ROM (controlled by GPIOs). The CS7410 also
supports code storage in external FLASH with in-
system write capability for customer code updates.
Future firmware releases will provide a complete
solution requiring no external ROM.
3.4
The CD Interface receives compressed or uncom-
pressed (direct audio) data from the CD servo/read
channel chip, performs descrambling and CRC
checking, and writes the data to an internal FIFO.
Additional C3 error decoding is done in software.
The CD interface is compatible with all commonly
used CD formats.
The CS7410 contains a hardware pattern matching
circuit to scan the incoming CD data for a pattern
of up to 64 bytes. This circuit is used to assist the
Electronic Shock Protection function by quickly lo-
cating and matching the incoming data with data
stored in the ESP RAM.
3.5
The system control functions are used to coordinate
the activities of the multiple processors, and to pro-
vide the supporting system operations. Two 32-bit
communication registers are available for inter-
CD Interface
System Control Functions
CS7410
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