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參數(shù)資料
| 型號(hào)： | SAA2013 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Adaptive allocation and scaling for PASC coding in DCC systems |
| 中文描述： | 自適應(yīng)分配和戴納信貸混凝劑縮放系統(tǒng)編碼 |
| 文件頁(yè)數(shù)： | 13/32頁(yè) |
| 文件大?。?/td> | 137K |
| 代理商： | SAA2013 |
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May 1994
13
Philips Semiconductors
Preliminary specification
Adaptive allocation and scaling for PASC
coding in DCC systems
SAA2013
Table 5
Interface modes.
MODE
ADDRESS
INTERFACE MODE
LENGTH (BITS)
DIRECTION
BIT 1
BIT 0
Decode
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
extended settings
settings
status/peak
extended settings
allocation/scale
settings
status/peak
8
16
16 or 48
8
48
×
16
16
16 or 48
microcontroller to SAA2003
microcontroller to SAA2003
SAA2003 to microcontroller
microcontroller to SAA2003
SAA2013 to SAA2003
microcontroller to SAA2003
SAA2003 to microcontroller
Encode
P
RIORITY
Each type of transfer has a priority. The priorities are:
1.
Allocation/scale/settings (highest priority).
2.
Status read.
3.
Peak read.
4.
Extended settings (lowest priority).
A
LLOCATION AND SCALE FACTOR TRANSFER
The allocation and scale factor information sent from
SAA2013 to SAA2003 during encode has the highest
priority. The other types of transfer interleaved with the
allocation/scale information.
S
ETTINGS TRANSFER
This is a 16-bit transfer. The microcontroller sends settings
to SAA2003. SAA2013 only transfers these without taking
notice of the contents. In encode, the settings are held in
the transit registers, and sent next time that allocation is
being sent. In decode, settings are sent as soon as
possible subject to the RTRC flag from SAA2003.
Before sending settings the microcontroller should read
the status of SAA2013 to examine the Ready-To-Receive
bit Settings (RTRS). After the settings have been received
by SAA2013, RTRS will be made logic 0, until the settings
have been sent to SAA2003. Only after RTRS is logic 1
again may the microcontroller send new settings.
S
TATUS READ
Status and peak information may be read from SAA2003
by the microcontroller. The status bits are defined in
Table 6.
Table 6
Status bits.
BIT
NAME
FUNCTION
VALID IN
B15 to B12
B11 and B10
B9
B8
B7 and B6
bit rate index
sample frequency indication
RTRS (settings)
RTRE (external settings)
MODE
bit rate indication
44.1, 48, 32 kHz indication
1 = ready; 0 = not ready
1 = ready; 0 = not ready
sub-band signal mode
identification
synchronization indication
1 = OK; 0 = not OK
transparent bits
emphasis indication
encode/decode
encode/decode
encode/decode
encode/decode
encode/decode
B5
B4
B3 and B2
B1 and B0
SYNC
CLKOK
Tr0 and Tr1
EMPHASIS
encode/decode
encode/decode
encode/decode
encode/decode
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