ml7084-001 Oki Semiconductor, ml7084-001 Datasheet - Page 49

• Manufacturer Part Number: ml7084-001
• Description: 4ch Voip Codec
• Manufacturer: Oki Semiconductor

2) Operating
3) Stop
4) Error processing (receive error)
5) Activation interval
Valid write period
Note:
This operational description is pertaining to the case of the 10 ms mode; in the 20 ms mode, the valid read period and
valid write period are as follows:
Valid read period:
Valid write period:
OKI Semiconductor
The data written by the MCU in the valid write period WE_SCn is output in decode output segment Rn_CH0.
This operation is repeated until stopping. (n = 1, 2, 3, 4, ...)
Set SC_CH0EN “1” → “0” and DEC_OUTON “1” → “0”.
Decoding after stop is invalid.
Within a maximum of 250 μs after SC_CH0EN has been set to "0", the decoder stops and outputs silence data.
An example of receive error occurrence is shown in the valid write period WE_SC6.
If writing of data is not finished within the valid write period, RXERR_CH0 becomes "1".
The state of RXERR_CH0 is maintained during and after the next valid write period until immediately before
the frame during which data is normally written to the receive buffer is terminated.
If an error has occurred in the valid write period WE_SC6, generated data is output according to the PLC
(Packet Loss Concealment) algorithm defined in G.711 Appendix I in the decode output segment R6_CH0.
However, silence data is output if the G.711 PLC function is disabled.
An interval of 10.0 ms or more is necessary after the speech codec has stopped before it is activated again.
There is no time limit for the first valid write period WE_SC1 after starting a speech codec.
In the valid write period WE_SC2, finish a write to the receive buffer within 2.0 ms from a fall of FR1B, or after
FR1 changes from “0” to “1”.
In the valid write period WE_SC3 and succeeding segments, finish a write to the receive buffer within 9.0 ms
from a fall of FR1B, or after FR1 changes from “0” to “1”.
Finish a read from the transmit buffer within 18.0 ms from a fall of FR0B, or after FR0_CH0 changes from “0”
to “1”.
There is no time limit for the first valid write period WE_SC1 after starting a speech codec.
In the valid write period WE_SC2, finish a write to the receive buffer within 12.0 ms from a fall of FR1B, or
after FR1 changes from “0” to “1”.
In the valid write period WE_SC3 and succeeding segments, finish a write to the receive buffer within 18.0 ms
from a fall of FR1B, or after FR1 changes from “0” to “1”.
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