tm1300 NXP Semiconductors, tm1300 Datasheet - Page 139

• Manufacturer Part Number: tm1300
• Description: Tm-1300 Media Processor
• Manufacturer: NXP Semiconductors

Audio Out
9.1
The TM1300 Audio Out (AO) unit is new and contains
many features not available in the TM1100. It has up to
8 channels, and drives up to 4 external stereo D/A con-
verters through a flexible bit-serial connection.
It provides all signals to interface to high quality, low cost
oversampling D/A converters, including a precisely pro-
grammable oversampling D/A system clock. The AO unit
and external D/A’s together provide the following capa-
bilities:
• Up to 8 channels of audio output.
• 16-bit or 32-bit samples per channel.
• Programmable sampling rate.
• Internal or external sampling clock source.
• Autonomously reads processed audio data from
• Supports 16-bit mono and stereo PC standard mem-
• Supports little- and big-endian memory formats.
• Provides control capability for highly integrated PC
9.2
• Individual serial data outputs to each D/A
• 32-bit samples
• No 8-bit sample support
No support for connecting several D/As to one serial data
output.
Table 9-1. AO unit external signals
AO_OSCLK
Signal
memory using double buffering (DMA).
ory data formats.
codecs such as the AD1847, CS4218 or UAD1340.
AUDIO OUT OVERVIEW
NEW AND CHANGED FEATURES
Type
OUT
Over sampling clock. Can be pro-
grammed to emit any frequency up to 40
MHz, with sub-Hz resolution. Intended for
use as the 256 or 384f
clock by the external D/A conversion sub-
system.
Description
s
oversampling
Table 9-1. AO unit external signals
PRODUCT SPECIFICATION
AO_SCK
AO_WS
AO_SD1
AO_SD2
AO_SD3
AO_SD4
Signal
by Gert Slavenburg, Santanu Dutta
Type
OUT
OUT
OUT
OUT
IO
IO
• When AO is programmed to act as a
• When AO is programmed to act as
AO_SCK is limited to 22 MHz. The sam-
ple rate of valid samples embedded within
the serial stream is limited by the
AO_SCK maximum frequency and the
available highway bandwidth.
• When AO is programmed as the serial-
• When AO is programmed as serial-
AO_WS is the word-select or frame-sync
signal from/to the external D/A sub-
system. Each audio channel receives 1
sample for every WS period.
AO_WS can be set to change on
AO_OSCLK positive or negative edges by
the CLOCK_EDGE bit.
Serial data to stereo external audio D/A
subsystem. AO_SD1 can be set to
change on AO_OSCLK positive or nega-
tive edges by the CLOCK_EDGE bit.
Serial data to stereo external audio D/A
subsystem. AO_SD2 can be set to
change on AO_OSCLK positive or nega-
tive edges by the CLOCK_EDGE bit.
Serial data to stereo external audio D/A
subsystem. AO_SD3 can be set to
change on AO_OSCLK positive or nega-
tive edges by the CLOCK_EDGE bit.
Serial data to stereo external audio D/A
subsystem. AO_SD4 can be set to
change on AO_OSCLK positive or nega-
tive edges by the CLOCK_EDGE bit.
serial interface timing slave (RESET
default), AO_SCK acts as input. It
receives the serial clock from the
external audio D/A subsystem. The
clock is treated as fully asynchronous
to the TM1300 main clock.
serial interface timing master,
AO_SCK acts as output. It drives the
serial clock for the external audio D/A
subsystem. Clock frequency is a pro-
grammable integral divide of the
AO_OSCLK frequency.
interface timing slave (RESET default),
AO_WS acts as an input. AO_WS is
sampled on the opposite AO_SCK
edge at which AO_SDx are asserted.
interface timing master, AO_WS acts
as an output. AO_WS is asserted on
the same AO_SCK edge as AO_SDx.
Description
Chapter 9
9-1