CS48500

` Cost-effective, High-performance 32-bit DSP
- 300,000,000 MAC/S (multiply accumulates per second)
- Dual MAC cycles per clock
- 72-bit accumulators are the most accurate in the industry
- 24k x 32 SRAM, 2k blocks - assignable to data or program
- Internal ROM contains a variety of configurable sound enhancement feature sets
- 8-channel internal DMA
- Internal watch-dog DSP lock-up prevention
` DSP Tool Set w/ Private Keys for Protecting Customer IP
` Configurable Serial Audio Inputs/Outputs
- Configurable for all input/output types
- Maximum 32-bit @ 192 kHz
- Supports 32-bit audio sample I/O between DSP chips
- TDM input modes (multiple channels on same line)
- 192 kHz SPDIF transmitter
- Multi-channel DSD direct stream digital SACD input
` Supports Two Different Input Fs Sample Rates
- Output can be master or slave
- Dual processing path capability
- Input supports dual domain slave clocking
- Hardware assist time sampling for sample rate conversion
` Integrated Clock Manager/PLL
- Can operate from external crystal, external oscillator
` Input Fs Auto Detection
` Host & Boot via Serial Interface
` Configurable GPIOs and External Interrupt Input
` 1.8V Core / 3.3V I/O that are +5V Tolerant
` Low-power Mode
- "Energy-Star Ready" via low-power mode, 350uW in standby Differentiating from the legacy Cirrus multi-standard, multichannel decoders, this new CS48500 family is still based on the same high-performance 32-bit fixed point DSP Digital Signal Processor core but instead is equipped with much less memory, tailoring it for more cost-effective applications associated with multi-channel and virtual-channel sound enhancements. Target applications are:
- Digital Televisions
- Multimedia Peripherals
- iPod® Docking Stations
- Automotive Head Units
- Automotive Outboard Amplifiers
- HD-DVD & Blu-ray Disc DVD Receivers
- PC Speakers
In these applications there are a wide variety of licensable DSP IP codes available today from:Cirrus also has developed, or is developing their own royaltyfree versions of popular features sets like Cirrus Bass Manager, Cirrus Dynamic Volume Leveler, Cirrus Original Multichannel Surround, Cirrus Virtual Speaker & Cirrus 3DAudio.

The CS48500 is programmed using the Cirrus proprietary DSP Composer™ GUI development tool. Processing chains may be designed using a drag-and-drop interface to place/utilize functional macro audio DSP primitives. The end result is a software image that is down-loaded to the DSP via serial host or serial boot modes.

The external program code may be encrypted by the programmer to protect any intellectual property it may contain. A secret, customer-specific key is used to encrypt the program code that is to be stored external to the device. Please contact your local Cirrus representative for details.

Multiplexed Pins
Many of the CS48500 pins are multi-functional. For details on pin functionality please refer to the CS48500 Hardware User's Manual.
Termination Requirements
Open-drain pins on the CS48500 must be pulled high for proper operation. Please refer to the CS48500 Hardware User's Manual to identify which pins are open-drain and what value of pull-up resistor is required for proper operation.

Mode select pins on the CS48500 are used to select the boot mode upon the rising edge from reset. A detailed explanation of termination requirements for each communication mode select pin can be found in the CS48500 Hardware User's Manual.
Pads
The CS48500 I/Os operate from the 3.3 V supply and are 5 V tolerant.