CSR8635 View Datasheet(PDF) - CSR plc

Part Name

Description

Manufacturer

CSR8635

The CSR8635 QFN single-chip Bluetooth® audio ROM device targets mid-range stereo speakers and headsets.

CSR plc 

6 Memory Interface and Management

6.1 Memory Management Unit

The MMU provides dynamically allocated ring buffers that hold the data that is in transit between the host, the air or

the Kalimba DSP. The dynamic allocation of memory ensures efficient use of the available RAM and is performed by

a hardware MMU to minimise the overheads on the processor during data/voice transfers. The use of DMA ports also

helps with efficient transfer of data to other peripherals.

6.2 System RAM

56KB of integrated RAM supports the RISC MCU and is shared between the ring buffers for holding voice/data for each

active connection and the general-purpose memory required by the Bluetooth stack.

6.3 Kalimba DSP RAM 27, 2013 Additional integrated RAM provides support for the Kalimba DSP:

ber ■ 16K x 24-bit for data memory 1 (DM1)

tem ■ 16K x 24-bit for data memory 2 (DM2)

p ■ 6K x 32-bit for program memory (PM)

6.4 Internal ROM Friday, Se Internal ROM is provided for system firmware implementation.

6.5 Serial Flash Interface t.com.cn - CSR8635 QFN supports external serial flash ICs. This enables additional data storage areas for device-specific data.

in CSR8635 QFN supports serial single I/O devices with a 1-bit I/O flash-memory interface.

lpo Figure 6.1 shows a typical connection between CSR8635 QFN and a serial flash IC.

keven.zhou - exce MCU

MCU Program

MCU Data

for qingbo Kalimba DSP Program

ared Kalimba DSP

Memory

Management

Unit

1.8V

QSPI_FLASH_CLK

QSPI_FLASH_CS#

QSPI_IO[0]

QSPI_IO[1]

Serial Quad I/O Flash

VDD

RESET#/HOLD#/IO3

WP#/IO2

CLK

CS#

DI/IO0

DO/IO1

PrepKalimba DSP Data

Figure 6.1: Serial Flash Interface

CSR8635 QFN supports Winbond, Microchip/SST, Macronix (and compatible) selected serial flash devices for PS

Key and voice prompt storage up to 16Mb, see firmware release note for up-to-date device support.

Production Information

© Cambridge Silicon Radio Limited 2013

Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement

Page 30 of 105

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