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參數(shù)資料
| 型號： | SM5902AF |
| 廠商： | Seiko NPC Corporation |
| 英文描述： | compression and non compression type shock-proof memory controller |
| 中文描述： | 壓縮和非壓縮式防震內(nèi)存控制器 |
| 文件頁數(shù)： | 31/40頁 |
| 文件大?。?/td> | 312K |
| 代理商： | SM5902AF |
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NIPPON PRECISION CIRCUITS-31
SM5902AF
Digital audio interface
When the DIT flag is set to 1, the digital audio inter-
face output from pin DIT is enabled. The output
data structure is modulated using a preamble and
biphase mark encoding.
Figure 5. Frame format
Figure 6. Subframe format
Channel 2
M
Channel 1
W
B
W
M
W
Frame 0
Frame 191
Channel 2
Channel 1
Channel 2
Channel 1
Frame 1
Sub Frame
Sub Frame
Start Block
Auxiliary
Preamble
(Sync Groupe)
Digital Audio Sample Data
V
U
C
P
0
3 4
7 8
27 28
31
M
L
M
L
Audio Sample Validity
User Bit Data
Audio Channel Status
Sub Frame Parity
Preamble
Channel coding
Leading symbol = 0
11101000
11100010
11100100
Leading symbol = 1
00010111
00011101
00011011
B
M
W
The SM5902AF starts with 0, so only the preamble patterns for leading symbol = 0 are used.
Preamble
The preamble is a particular bit pattern used to per-
form subframe and block synchronization and dis-
crimination, assigned to one of 4 time slot divisions
(0 to 3), comprising 8 continuous biphase modulat-
ed transfer rate status indicators.
There are 3 types of preamble. The leading pream-
ble pattern of all blocks is preamble pattern B,
which is then followed by preamble pattern M for
channel 1, and preamble pattern W for channel 2.
Digital audio sample data and auxiliary audio
The digital audio sample data is a 20-bit digitized
audio signal. Auxiliary audio data, on the other
hand, can be audio sample data of varying length.
The SM5902AF uses a 16-bit audio data structure
internally with audio data output bits 4 to 11 set to 0
and bits 12 to 27 output in LSB first format.
Audio sample validity
The validity flag is set to 0 when the digital audio
sample data is output correctly, or it is set to 1 if the
output is incorrect. It is also set to 1 if encoding
does not start when the device is operating in
forced mute, microcontroller forced mute, and
shockproof mode.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SM5903BF | compression and non compression type shock-proof memory controller |
| SM5903CF | compression and non compression type anti-shock memory controller |
| SM5904BF | compression and non compression type shock-proof memory controller |
| SM5904CF | compression and non compression type |
| SM5905AF | compression and non compression type shock-proof memory controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SM5903BF | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:compression and non compression type shock-proof memory controller |
| SM5903BF_00 | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:compression and non compression type shock-proof memory controller |
| SM5903CF | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:compression and non compression type anti-shock memory controller |
| SM5904BF | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:compression and non compression type shock-proof memory controller |
| SM5904CF | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:compression and non compression type |
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