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TDA1315H 데이터시트(Datasheet) 10 Page - NXP Semiconductors

부품명 TDA1315H
상세내용  Digital audio input/output circuit DAIO
PDF  36 Pages
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제조사  PHILIPS [NXP Semiconductors]
홈페이지  http://www.nxp.com
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 10 page
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1995 Jul 17
10
Philips Semiconductors
Product specification
Digital audio input/output circuit (DAIO)
TDA1315H
Whenever MUTE is activated in any of the transmit modes, the audio data of the IEC output signal will be muted and the
validity bit set to logic 0, regardless of the INVALID input value. When SDAUX is selected, MUTE will also affect the
output at pin SD.
Table 2
Summary of validity and muting in the transmit mode
Note
1. X = don’t care.
INPUT CONDITIONS(1)
IEC OUTPUT SIGNAL
MUTE ACTIVATED
SDAUX SELECTED
INVALID INPUT
VALIDITY BIT
AUDIO BITS
No
no
0
0
from SD
No
no
1
1
from SD
No
yes
X
0
from SDAUX
Yes
X
X
0
0
NON-AUDIO SECTION
In the non-audio section, the first 30 channel status bits
are taken from each block of data. A selection of 16 bits is
then assembled as two bytes and transferred to the user
interface. In the event of an incorrect IEC signal, i.e. no
consumer mode, an error will be flagged at pin CHMODE.
The error signal will return to its passive state after a full
block of consumer mode data has been received. The user
data bits are searched for the beginning of a ‘message’
(see Section “User data”), which is then stored bytewise in
a buffer that can be read by an external microcontroller via
the user interface. In the transmit mode, channel status
and user data bits are taken from an internal buffer that
has been written to by an external microcontroller via the
user interface. These bits are required for frame
composition in the biphase modulator.
The non-audio section supports only the consumer mode
of the
“IEC 958” specification and handles the channel
status and user data information.
The non-audio section can be operated in the stand-alone
mode (receive only) and the host mode (transmit/receive).
In the stand-alone mode, a few bits from the channel
status are brought out to pins, the user data is not
available. In the host mode, channel status and user data
are exchanged using a microcontroller. After a RESET in
the host mode, the TDA1315H provides general format by
default.
Channel status
The channel status consists of 30 bits, a number of which
are reserved for future standardization. The 16 most
significant bits (MSBs), arranged as two bytes, are
exchanged using an external microcontroller. The
mapping of the channel status bits into these two bytes is
given in Tables 3 and 4. All SCMS operations (Serial Copy
Management System) will be performed in the
microcontroller and no manipulation in the TDA1315H is
possible. Bit 0 is always the first bit on the user interface.
In the receive mode, an error signal is generated at pin
CHMODE if a professional mode signal is received. Even
then, two bytes of information, mapped as defined in
Tables 3 and 4, are generated for output. Although there
are two bytes of channel status available for output, only
the first byte can be read. To identify future modes of the
channel status, both mode bits (bits 6 and 7 in the channel
status) are available (inverted) from the TDA1315H status
register. The channel status is created from the left
channel subframes of the IEC signal (preambles ‘B’
and ‘M’).
Whenever the channel status, as defined in
Tables 3 and 4 (16 bits), differs from the previously
received channel status, a bit will be set in the TDA1315H
status register. This helps to reduce the data traffic by
enabling the microcontroller to read the channel status
only after it has changed.
In the transmit mode, the microcontroller supplies
consumer mode (Mode 0) channel status data as
described in Table 3. Both bytes need to be transferred.




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