ml7084-001 Oki Semiconductor, ml7084-001 Datasheet - Page 64

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

Serial Control Interface
(1) Overview
This LSI has two systems of serial control interfaces.
One serial control interface can control read and write operations to the control registers on the DSP_A side, and the
other can control read and write opeations to the control registers on the DSP_B side.
Each of the serial control interfaces consists of four pins: SDENB pin, SCLK pin, SDI pin and SDO pin. The
SDENB pin is a data enable signal input pin, the SCLK pin is a data shift clock signal input pin, the SDI pin is an
address and data input pin, and the SDO pin is a data output pin. To use the serial control interfaces, it is necessary to
set the SCNTEN pin to “1”.
(2) Write and Read Control Timings
Figure 27 shows write and read control timings in the serial control interfaces.
Write and read operations are controlled in units of 16 bits consisting of 2 control bits (RW and CD), a 6-bit address
(A[5:0]) and 8-bit data (D[7:0]).
• Control bit
• Address A[5:0]
• Data D[7:0]
Note: To use serial control interfaces, it is necessary to set the SCNTEN pin to “1”. However, note that the control
OKI Semiconductor
RW : “0” = At write control, ”1” = At read control
CD : “0” = Upon access to a control register, ”1” = Upon access to the register for download/GPIO
Specify the address of the control register or register for download/GPIO to which write/read control is to be
performed.
Note: Note that some of the addresses to be specified differs between parallel bus interface access and serial
control interface access.
Specify data to be written to the control register or register for download at the time of write control. The data of
the control register at the address specified is output at read control.
registers cannot be accessed via a parallel bus interface in this case. Only the transmit and receive buffers can
be accessed via a parallel bus interface.
Write control
Read control
SDENB
SDENB
SCLK
SCLK
SDI
SDO
SDO
SIN
ts2
ts2
ts1
ts1
W
ts3
ts3
R
Figure 27 Serial Control Interface Timings
Control
Control
Hi-Z
CD A5
CD A5
Hi-Z
A4
A4
Address A [5:0]
Address A [5:0]
A3
A5
ts5
A2
A2
ts4
ts6
A1
A1
A0
ts7
A0
D7
D7
ts8
D6
D6
Write data D [7:0]
Read data D [7:0]
D5
D5
D4
D4
D3
D3
D2
D2
D1
D1
ts9
ts9
D0
D0
ts10
ts11
ts11
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