11

Timing Information

Fig.6 Codec Direct Access Timing

NOT TO SCALE

DECODER TIMING

ENCODER CLOCK

ENCODER DATA

BITS OUT

t

PCO

t

CH

t

CL

DECODER CLOCK

DECODER DATA

BITS IN

t

CH

t

CL

ENCODER TIMING

t

SU

Data True Time

Data Clocked

Data Clocked

Fig.5 “C-BUS” Timing Information

NOT TO SCALE

Direct Access Timing – Figure 6

Parameter

Min.

Typ

Max.

Unit

t

CH

1.0

–

–

µs

t

CL

1.0

–

–

µs

t

SU

450

–

–

ns

t

H

600

–

–

ns

t

PCO

–

–

750

ns

t

= Data True Time

“C-BUS” Timing – Figure 5

Parameter

Min.

Max.

Unit

abc

t

CSE

2.0

4.0

8.0

–

µs

t

CSH

4.0

4.0

8.0

–

µs

t

HIZ

–––

2.0

µs

t

CSOFF

2.0

4.0

8.0

–

µs

t

NXT

4.0

8.0

16.0

–

µs

t

CK

2.0

4.0

8.0

–

µs

Notes

(1)

Minimum Timing Values

(a)

For all commands except “Read Data” and “Write Data” commands.

(b)

For “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, LSB

(bit0) last. Reply Data is read from the peripheral MSB (bit7) first, LSB (bit0) last.

(3)

To allow for differing

µController serial interface formats “C-BUS” compatible ICs are able to work with either polarity

Serial Clock pulses.

(4)

Data sent from the

µController is clocked into the FX802 on the rising edge of the Serial Clock pulses. Reply Data

sent from the FX802 to the

µController is clocked into the µController when the Serial Clock is “high.”

(5)

Loaded commands are acted upon at the end of each command.

Direct Access

SERIAL CLOCK

COMMAND DATA

t

CSE

t

CSOFF

t

HIZ

ADDRESS/COMMAND

BYTE

FIRST DATA BYTE

LAST DATA BYTE

7

6

5

4321

0

7

65

4321

0

7

6

5

4

321

0

76

5

4

321

0

MSB

LSB

CHIP SELECT

LAST REPLY DATA BYTE

t

CK

REPLY DATA

MSB

LSB

FIRST REPLY DATA BYTE

Logic level is not important

76

5

4321

0

t

NXT