ml7033 Oki Semiconductor, ml7033 Datasheet - Page 29

• Manufacturer Part Number: ml7033
• Description: Dual-channel Line Card Codec
• Manufacturer: Oki Semiconductor

CR3 (Time slot assignment control)
* CR3 is a write only register.
B7
B6
B5 to B0
1 Semiconductor
default
CR3
BCLK
XSYNC
PCMOUT/
PCMIN
PCMOSY
Figure 12 Example of Time Slot Assignment: CH1 = Slot 0, CH2 = Slot 3
TSAE
… Time slot assignment customization enable
… Time slot assignment channel select
… Assigned time slot select
B7
0
0 : Default time slot assignment
The default time slot assignment is CH1 for Slot 0 and CH2 for Slot 2.
This bit is used to specify the channel for which the accompanied TSAn
(CR3-B5 to B0) bits are going to assign a time slot. Hence, when a customized time slot
assignment is enabled, CR3 should be written twice; once for CH1 and another for CH2.
Each time slot consists of 8 BCLK cycles. The number of time slots available for time slot
assignment depends upon the applied BCLK frequency, and can be calculated in the
following equations;
Number of time slots available for time slot assignment
= (BCLK frequency)/(SYNC frequency)/8
= (BCLK frequency)/64k
For instance, when the BCLK frequency is 4096 kHz, time slots that can be assigned are
from 0 (000000) to 63 (111111). The specification of a time slot beyond 63 is prohibited.
Note that in 14-bit linear PCM (2’s complement) mode, specified when the LIN bit (CR0-
B3) is set, only even numbered time slots (0, 2, 4, … 62) can be assigned.
In any mode, the assigned time slot for a channel is common both for transmit and receive,
and different time slots cannot be assigned for transmit and receive. When the TSAE bit
(CR3-B7) is cleared, the time slot assignment specified by these bits is ignored, and the
default time slots are assigned (CH1 for Time Slot 0 and CH2 for Time Slot 2). Figure 12
shows an example of how CH1 is assigned for Time Slot 0 (000000) and CH2 is assigned
for Time Slot 3 (000011) in 8-bit PCM mode.
1
CH1 PCM DATA
Slot 0
TSAC
B6
0
9
TSA5
B5
0
Slot 1
TSA4
B4
0
1 : Customized time slot assignment
17
0 : CH1
Slot 2
TSA3
B3
0
25
1 : CH2
CH2 PCM DATA
TSA2
B2
0
Slot 3
TSA1
B1
0
33
FEDL7033-02
TSA0
ML7033
B0
0
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