DVSR CODEC
22
MX802
Notes:
1. Minimum Timing Values
a. For all commands except “Read Data” and “Write Data” Commands.
b. For all “Read Data” and Write Data” commands when no “Speech Store” or “Speech Play” commands
are active.
c. For “Read Data” and “Write Data” commands when “Speech Store” or “Speech Play” commands are
active.
2. Depending on the command, 1 or 2 bytes of Command Data are transmitted to the peripheral MSB (bit7)
first and LSB (bit0) last. Reply data is read from the peripheral MSB (bit7) first and LSB (bit0) last.
3. To allow for different microcontroller serial interface formats, C-BUS compatible ICs are able to work with
either polarity Serial Clock pulses.
4. Data is clocked into and out of the peripheral on the rising Serial clock edge.
5. Loaded commands are acted upon at the end each command.
tCSOFF
CHIP SELECT
tCSE
tCSH
tNXT
tNXT
SERIAL CLOCK
tCK
COMMAND DATA
7
6
5
4
3
2
1
0
7
6
6
5
4
3
2
1
0
7
7
6
6
5
4
3
2
1
1
0
0
MSB
LSB
FIRST DATA BYTE
LAST DATA BYTE
ADDRESS/COMMAND
BYTE
tHIZ
REPLY DATA
7
5
4
3
2
1
0
5
4
3
2
MSB
LSB
Logic level is not important
FIRST REPLY DATA BYTE
LAST REPLY DATA BYTE
Figure 9: C-BUS Timing Information
Figure 10: Codec Direct Access Timing
ꢀ1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480033.008
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