CXD2720Q Datasheet, PDF (20/40 Pages) Sony Corporation – Single-Chip Digital Signal Processor for Karaoke

CXD2720Q
(3) Data Structure
Data structure is classified in three types, as shown in the table below. All data communication is done with
LSB first.
Name
A0 to A7
M0 to M7
D0 to D15/SQ00 to SQ23
Bit length
8
8
16/24
Contents
Remarks
Address section
Transmission
mode section
Data section
Coefficient RAM is 16 bits; setup register is
24 bits
Table 6-2. Data Structure
(3)-1. Transmission Mode Section
The transmission mode section is 8 bits and has the following functions.
Bit Name
Function
M7 XVMT
SO Mute
0: ON (No sound)
1: OFF
M6
Reserve
M5
M4
VS1
M3
VS0
Data type
VS1 VS0
0
0 Setup register
1
0 Coefficient RAM (K-RAM)
M2
Reserve
M1
0: Receive
M0
VRD
Send/Receive _{1: Send}
Note) Polarity as seen from the CXD2720Q
Table 6-3. Transmission Mode Section
(3)-2. Address Section
The coefficient RAM has a 192-word structure, so the address section is 8 bits. The setup register has a 1-
word structure, so the address section data may be optional.
(3)-3. Data Section
Sixteen SCK are required, as the coefficient RAM has a 16-bit structure (D0 to D15). The setup register has a
24-bit structure (SQ00 to SQ23), so twenty-four SCK are required.
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