SAM5708B datasheet(4/89 Pages) ETC1

4 / 89 page

SAM5708B

SAM5708B.pdf

– Rev 14/05/2018

1.3.

DSP Array

– 8 * P24XT

The SAM5708B is built around an Array of 8 new 24-bit DSP cores (P24XT).

Similarly to previous generation, each P24XT DSP core includes a 2k x 24 RAM and a 2k x 24

ROM. The RAM contains both data and DSP instructions, while the ROM contains typical

coefficients such as FFT cosines and windowing and micro-code for hardware accelerated micro-

instructions.

The P24 sends and receives audio samples through the Sync Bus at the frame rate (typically,

48kHz frame period = 2048 cycles at 98.8 MHz). For the transfer of all other data, the P24XT is

able to communicate in an asynchronous way through Async Busses. P24XT memories can be

accessed through the Async Bus by others.

A lot of operations can be performed with much more precision with new P24XT core.

For single-precision operations:

 Programmable 24-bit fixed format: 1.0.23, 1.2.21, 1.8.15 or 1.15.8

 56-bit MAC unit with 24-bit x 24-bit multiplication + 8 guard bits to prevent overflow issues

For double-precision operations:

 Programmable 48-bit fixed format: 1.0.47, 1.2.45, 1.8.39 or 1.15.32

 Large set of 48-bit Double Precision (DP) operations

The P24XT DSP core also offers hugely improved performances with a new and rich set of

hardware accelerated macro-instructions:

ADD, MUL, MAC operations on vectors can be performed with only one macro-

instruction, address pointers being self-incremented

ring buffer structures are supported in several vector instructions

several arithmetic operations are available: SIN, COS, DIV, LN, EXP, …

Operations on complex values in single and double precision

Polynomial calculation in single and double precision

Optimized filtering instructions: 1

st & 2nd order filters, programmable number of taps,

single or double precision

Based on polynomial interpolation, up to 24 sounds (at typical 48kHz frame clock) with high quality

filtering can be synthesized within one P24XT and up to 50M of 56-bit MAC operations can be

performed per second.

1.4.

Sync Bus

The Sync Bus transfers audio samples on a frame basis, typical frame rates being 44.1, 48, 96 &

192 kHz. Each frame is divided into 32 time slots. Each slot is divided into 8 bus cycles. Each

P24XT is assigned a hardwired time slot (16 to 31), during which it may provide 24-bit data to the

bus (up to 8 data samples). Each P24 can read data on the bus at any time, allowing inter P24

communication at the current sampling rate. Slots 0 to 15 are reserved for a specific router DSP,

which also handles audio out, audio in, and remix send.

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