參數(shù)資料
型號(hào)： IDT821068
廠商： Integrated Device Technology, Inc.
元件分類： Codec
英文描述： OCTAL PROGRAMMABLE PCM CODEC
中文描述： 八路可編程PCM編解碼器
文件頁數(shù)： 8/45頁
文件大?。?/td> 589K
代理商： IDT821068
INDUSTRIAL TEMPERATURE RANGE
IDT821068 OCTAL PROGRAMMABLE PCM CODEC
8
Linear GCI Structure
In GCI linear mode, one GCI frame consists of 8 GCI time slots,
each GCI time slot consists of four 8-bit bytes. Four of the 8 time slots
are used as Monitor Channel and C/I octet, they have a common data
structure:
- Two Don’t Care bytes.
- One monitor channel byte, which is used for reading/writing control
data/coefficients from/to the device for channel A and B.
- One C/I byte, which contains a 6 bit width C/I channel sub-byte
together with an MX bit and an MR bit. All real time signaling
information is carried on the C/I channel sub-byte. The MX (Monitor
Figure 5. Linear GCI Frame Structure When TS Is Low
TS0
TS1
TS2
TS3
TS4
TS5
TS6
TS7
TS0
TS1
TS2
TS3
TS4
TS5
TS6
TS7
Detail A
Don't Care
Don't Care
Monitor Channel
C/I Channel
M
R
M
X
Don't Care
Don't Care
Monitor Channel
C/I Channel
M
R
M
X
125
μ
s
FSC
DCL
DD
DU
DU
DD
Detail A
Detail B
DU
DD
Detail B
16-bit Linear Voice Data for Channel A
16-bit Linear Voice Data for Channel B
16-bit Linear Voice Data for Channel A
16-bit Linear Voice Data for Channel B
TS0-3 for Monitor and C/I
TS4-7 for Linear Voice
Data
TS = 0
IDT821068
Channels
1
2
3
4
5
6
7
8
Timeslot
Timeslot0
Timeslot0
Timeslot1
Timeslot1
Timeslot2
Timeslot2
Timeslot3
Timeslot3
Monitor and C/I
A
B
A
B
A
B
A
B
Timeslot
Timeslot4
Timeslot4
Timeslot5
Timeslot5
Timeslot6
Timeslot6
Timeslot7
Timeslot7
Voice Channel
A
B
A
B
A
B
A
B
TS = 1
1
2
3
4
5
6
7
8
Timeslot4
Timeslot4
Timeslot5
Timeslot5
Timeslot6
Timeslot6
Timeslot7
Timeslot7
A
B
A
B
A
B
A
B
Timeslot0
Timeslot0
Timeslot1
Timeslot1
Timeslot2
Timeslot2
Timeslot3
Timeslot3
A
B
A
B
A
B
A
B
Transmit) bit and MR (Monitor Receive) bits are used for handshaking
functions for channel A and B. Both MX and MR bits are active low.
Other four GCI time slots are used for linear voice data (16-bit 2’s
complement). Each time slot consists of two 16-bit linear voice data
bytes: one byte contains the linear voice data for channel A, the other
byte contains the linear voice data for channel B.
The GCI time slot assignment is determined by the TS pin. When
TS is low, the linear GCI Frame Structure is shown in Figure 5.
In linear operation, total eight GCI time slots are required to access
the eight channels of IDT821068. See Table 2 for detailed information
about time slot assignment for linear mode.
Table 2 - Time Slot Selection for linear GCI
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