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參數(shù)資料
| 型號： | AM79Q062JC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 編解碼器 |
| 英文描述： | A/MU-LAW, PCM CODEC, PQCC32 |
| 封裝： | PLASTIC, LCC-32 |
| 文件頁數(shù)： | 66/95頁 |
| 文件大?。?/td> | 1399K |
| 代理商： | AM79Q062JC |
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SLAC Products
69
Programming with the Monitor Channel
The QSLAC device uses the monitor channel for the transfer of status or mode information to and from higher
level processors.
The messages transmitted in the monitor channel have different data structures. The first byte of monitor channel data
indicates the address of the device either sending or receiving the data.
All Monitor channel messages to and from the QSLAC device begin with the following address byte::
A = 0; Channel 1 is the source (upstream) or destination (downstream)
A = 1; Channel 2 is the source (upstream) or destination (downstream)
B = 0; Data destination determined by A
B = 1; Both channels, 1 and 2, receive the data
C = 0; Address for channel identification command
C = 1; Address for all other commands
The monitor channel address byte is followed by a command byte. If the command byte specifies
a write, then from 1 to 14 additional data bytes may follow (see Table 4). If the control byte
specifies a read, additional data bytes may follow. The QSLAC device responds to the read
command by sending up to 14 data bytes upstream containing the information requested by
the upstream controller. Shown next is the generic byte transmission sequence over the GCI
monitor channel.
Table 4. Generic Byte Transmission Sequence
Note:
* May or may not be present
Bit
7
6
5
4
3
2
1
0
1
0
A
B
0
C
GCI Monitor Channel
Downstream
Upstream
ADDRESS
Control byte, write
Data byte 1*
Data byte m*
ADDRESS
Control byte, read
m
≤ 14
Data byte 1
Data Byte n
n
≤ 14
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