DVSR CODEC
8
MX802
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480033.008
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
4.1
Controlling Protocol
Control of the functions of the MX802 DVSR Codec is by a group of Address/Commands (A/Cs) and
appended instructions of data to and from the system microcontroller (See Figure 4). The use and content of
these instructions is detailed in the following pages.
Command Assignment
Address/Command (A/C) byte
Data Bytes
Hex
Binary
MSB
LSB
General Reset
01
00000001
Write to Control Register
60
01100000
+2 byte instruction to Control
Register
Read Status Register
61
01100001
+1 byte reply from Status Register
Store ‘N’ pages. Start page ‘X’
62
01100010
+2 bytes command – Immediate
Store ‘N’ pages. Start page ‘X’
63
01100011
+2 bytes Command – Buffered
Play ‘N’ pages. Start page ‘X’
64
01100100
+2 bytes Command – Immediate
Play ‘N’ pages. Start page ‘X’
65
01100101
+2 bytes Command – Buffered
Write Data. Start page ‘P’
66
01100110
+2 bytes ‘P’ + Write Data
Read Data. Start page ‘P’
67
01100111
+2 bytes ‘P’ + Read Data
Write Data – continue
68
01101000
+Write Data
Read Data -- Continue
69
01101001
+Read Data
Table 3: C-BUS Address/Commands
4.1.1
Address/Commands
Instruction and data transactions to and from this device consist of an Address/Command (A/C) byte followed
by further instruction/data reply.
Control and configuration is by writing instructions form the microcontroller to the Control Register (60H).
Reporting of MX802 configurations is by reading the Status Register (61H).
4.1.2
Operation with DRAM
The MX802 can operate with up to 4Mbits of Dynamic Ram (DRAM). When used with DRAM, the MX802
performs four main functions under the control of the commands received over the C-BUS interface from the
microcontroller:
Stores Speech
The MX802 stores speech by digitally encoding the analog input signal and writing the
resulting digital data into the associated DRAM.
Plays Speech
The MX802 plays back stored speech by reading the digital data stored in the DRAM and
decoding it to provide and analog output signal.
Writes Data
The MX802 writes data sent ver the C-BUS from the microcontroller to DRAM.
Reads Data
The MX802 reads data from DRAM, sending it to the microcontroller over the C-BUS.
Data is directed to and from DRAM by the on-chip DRAM Controller.
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