ml7084-001 Oki Semiconductor, ml7084-001 Datasheet - Page 38

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

D.
E.
OKI Semiconductor
from the MCU side is automatically switched at every buffering time or by the completion of reading or writing
of the specified number of words. Therefore, when accessing from the MCU side, the transmit or receive buffer
can be accessed as one buffer.
Select the data width used to access the transmit and receive buffers for CH0a/CH1a (TX-FIFOa/RX-FIFOa)
with the MCU interface data width selection register_a (BW_SELa), and the transmit/receive buffer for
CH0b/CH1b (TX-FIFOb/RX-FIFOb) with the MCU interface data width selection register_b (BW_SELb).
In the 8-bit mode, the transmit and receive data are input or output to D7 to D0. During the 8-bit access mode,
the bits D15 to D8 will always be in the input state.
Structure of Transmit and Receive Buffers
Examples of timings of accessing the transmit and receive buffers are shown in Figure 13.
Although both the transmit and the receive buffers have a double buffer structure, the buffer to be accessed
Data Width Selection (16-Bit Mode, 8-Bit Mode)
As for the data width used to access the transmit and receive buffers, either 16 bits or 8 bits can be selected.
During the 16-bit mode, the access is made with a data width of 16 bits and the data bits D15 to D0 are accessed.
Figure 13 Timings of Accessing the Transmit and Receive Buffers (Example)
Transmit buffer
Transmit buffer
Receive buffer
Receive buffer
Switching from TX-FIFO0 to TX-FIFO1 and from RX-FIFO0 to RX-FIFO1 is automatically
made by the completion of reading or writing of the specified number of words . Switching from
TX-FIFO1 to TX-FITO0 and from RX-FIFO1 to RX-FIFO0 is automatically made by a lapse of
buffering time (10 ms/20 ms).
(1) For single-channel operation
(2) For 2-channel operation
Switching between TX-FIFO0 and TX-FITO1 and between RX-FIFO0 and RX-FIFO1 is
automatically made at every buffering time (10 ms/20 ms).
Read from the MCU
FIFO0
TX-
FIFO0
10 ms/20 ms
10 ms/20 ms
RX-
RX-FIFO0
TX-FIFO0
Read from the MCU
Write from the MCU
Write from the MCU
FIFO1
TX-
FIFO1
RX-
FIFO0
TX-
FIFO0
RX-
TX-FIFO1
RX-FIFO1
FIFO1
TX-
FIFO1
RX-
FIFO0
TX-
FIFO0
RX-
RX-FIFO0
TX-FIFO0
FIFO1
TX-
FIFO1
FEDL7224-001FULL-01
RX-
ML7224-001TC
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