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參數資料
| 型號： | TDA1315H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Digital audio input/output circuit DAIO |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 文件頁數： | 9/36頁 |
| 文件大小： | 411K |
| 代理商： | TDA1315H |
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1995 Jul 17
9
Philips Semiconductors
Product specification
Digital audio input/output circuit (DAIO)
TDA1315H
Table 1
Summary of validity and muting in the receive mode
Note
1.
X = don’t care.
INPUT CONDITIONS
(1)
OUTPUTS
PLL LOCKED
MUTE
ACTIVATED
SDAUX
SELECTED
I
2
SOUT
ENABLED
VALIDITY BIT
INVALID
SD
X
No
X
Yes
Yes
Yes
X
X
X
X
X
no
no
yes
no
yes
yes
yes
yes
yes
X
X
X
0
1
X
3-state
0
0
0
1
0
3-state
0
0
IEC
IEC
SDAUX
yes
no
no
no
When the I
2
S-bus output Port is disabled by pin I
2
SOEN in
the stand-alone mode, pins WS, SCK, SD and INVALID
will immediately become 3-state. If, however, this is
performed in the host mode via the I
2
SOEN pin or the
corresponding bit in the control register, only SD and
INVALID will become 3-state immediately. Pins WS and
SCK will only become 3-state after the rising edge of
STROBE when the STROBE pulse changes the setting
from receive to transmit mode. Thus in the host mode,
when remaining in the receive mode, I
2
SOEN only
influences the SD and INVALID pins. Pins WS and SCK
are always enabled. When the I
2
S-bus output Port is
re-enabled, data output will start with the beginning of a
new stereo sample.
Transmit mode
Although the IEC subframe format supports up to 24 bits
per audio sample, the number of significant bits can be
selected as 16, 18, 20 or 24 via the control register.
Because the I
2
S-bus Port then operates as a receiver, the
timing has to be selected so that all data bits can be
received. Any bits unused or unsupplied will be set to
logic 0.
The information regarding audio samples that may be
unreliable or invalid has to be entered at pin INVALID
simultaneously with the data input to pin SD. The timing
will be the same as in the CD decoder ICs (e.g. the EFAB
signal of the SAA7310, see Chapter “References”[5].
As the I
2
S-bus Port is used as an input, it must be disabled
by the correct combination of pin I
2
SOEN and the
corresponding bit in the control register. The pins WS and
SCK are set to 3-state on the rising edge of STROBE,
whenever the transmit mode is activated. I
2
SOEN
influences only the data pin SD. This allows for three
different configurations:
Transmit mode #1, I
2
SOEN = 1, I
2
SSEL = 1. In this
instance, I
2
S-bus timing and data are derived from an
external source and entered at pins WS, SCK and SD.
Output will be at pin IECO, if IECOEN permits.
Transmit mode #2, I
2
SOEN = 1, I
2
SSEL = 0. In this
instance, I
2
S-bus timing is derived from an external
source and entered at pins WS and SCK and is also
supplied to another I
2
S-bus source, such as an ADC.
Data from that other I
2
S-bus source is entered at pin
SDAUX. Output will be at pin IECO, if IECOEN permits.
In this instance, I
2
SSEL acts as a source selector for
pins SD and SDAUX.
Transmit mode #3, I
2
SOEN = 0, I
2
SSEL = 0. In this
instance, I
2
S-bus timing is derived from an external
source and entered at pins WS and SCK and is also
supplied to another I
2
S-bus source, such as an ADC.
Data from the other I
2
S-bus source is entered at pin
SDAUX. Output will be at pin IECO, if IECOEN permits,
and at pin SD. In this mode, SDAUX data is available
both at the IEC output (a type of digital monitor function)
and on the I
2
S-bus (e.g. for digital signal processing
purposes).
The remaining combination (I
2
SOEN = 0, I
2
SSEL = 1) is
not used. WS, SCK and SD are then 3-state.
Because the SDAUX input normally receives a signal from
an ADC, the signal at pin INVALID will not be interpreted
when this input is selected. All samples are assumed to be
valid. In all transmit modes, INVALID is an input pin.
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