DVSR CODEC

22

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.

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.

CHIP

SELECT

SERIAL

CLOCK

COMMAND

DATA

REPLY

DATA

ADDRESS/COMMAND

BYTE

FIRST

DATA

BYTE

LAST

DATA

BYTE

FIRST

REPLY

DATA

BYTE

LAST

REPLY

DATA

BYTE

Logic

level

is

not

important

MSB

LSB

7

6

5

4

3

2

1

0

7

6

5

4321

0

7

6

5

4

32

10

MSB

LSB

7654321

0

7

6

54

32

1

0

t

t

t

CSOFF

t

CSH

HIZ

t

NXT

t

NXT

CK

t

CSE

Figure 9: C-BUS Timing Information

Figure 10: Codec Direct Access Timing