Request AudioReQuest N.Series Manual descarregar pdf (Página 31)

USB Audio Design Guide 31/61

3.17 Resource Usage

The following table details the resource usage of each component of the reference

design software.

Component Cores Memory (KB) Ports

XUD library 1 9 (6 code) ULPI ports

Endpoint 0 1 17.5 (10.5 code) none

USB Buﬀering 1 22.5 (1 code) none

Audio driver 1 8.5 (6 code) See §3.8

S/PDIF Tx 1 3.5 (2 code) 1 x 1 bit port

S/PDIF Rx 1 3.7 (3.7 code) 1 x 1 bit port

ADAT Rx 1 3.2 (3.2 code) 1 x 1 bit port

Midi 1 6.5 (1.5 code) 2 x 1 bit ports

Mixer 2 8.7 (6.5 code)

ClockGen 1 2.5 (2.4 code)

Figure 23:

Resource

Usage

These resource estimates are based on the multichannel reference design with all

options of that design enabled. For fewer channels, the resource usage is likely to

decrease.

The XUD library requires an 80MIPS cores to function correctly (i.e. on a 500MHz

parts only six cores can run).

The ULPI ports are a ﬁxed set of ports on the L-Series device. When using these

ports, other ports are unavailable when ULPI is active. See the XS1-L Hardware

Design Checklist

for further details.

3.18 The USB Audio 2.0 Reference Design (L-Series) Software

The USB Audio 2.0 Reference Design is an application of the USB audio framework

speciﬁcally for the hardware described in §2.1 and is implemented on the L-Series

single tile device (500MIPS). The software design supports two channels of audio

at sample frequencies up to 192kHz and uses the following components:

· XMOS USB Device Driver (XUD)

· Endpoint 0

· Endpoint buﬀer

· Decoupler

· Audio Driver

· Device Firmware Upgrade (DFU)

http://www.xmos.com/published/xs1lcheck

REV 6.1

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 61 62

Sem comentários

Request AudioReQuest N.Series Manual Página 31