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CS4812 Datasheet(PDF) 24 Page - Cirrus Logic

Part # CS4812
Description  Fixed Function Multi-Effects Audio Processor
PDF  36 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS4812 Datasheet(HTML) 24 Page - Cirrus Logic

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CS4812
24
DS291PP3
PROM memory mapping is handled automatically
by the development tools and is transparent to the
designer.
3.5.2.2
I2C Slave Mode
In I2C slave mode, a write sequence from an exter-
nal host controller is shown in Figure 22.. The host
controller sends a write preamble consisting of a
start condition followed by the slave address for the
CS4812. The slave address byte consists of a 7-bit
address field (00100|AD1|AD0) followed by a
Read/Write bit (set to 0). AD1 and AD0 correspond
to the logic levels applied to the these pins on the
CS4812. The host controller then sends a MAP
byte which contains the address of the control reg-
ister to be accessed followed by the actual data byte
to be written to the register designated by the MAP.
Upon completion of this, the host controller then
sends a stop condition to complete the transaction.
Figure 21 shows the I2C slave mode write flow di-
agram
In I2C slave mode, a read sequence by an external
host controller is shown in Figure 23. The host con-
troller sends a write preamble to the CS4812 which
4
5
6
7
24 25
SCL
CHIP ADDRESS (WRITE)
MAP BYTE
DATA
DATA +1
START
ACK
STOP
ACK
ACK
ACK
0
0
1
0
0 AD1 AD0 0
SDA
INCR
6
5
4
3
2
1
0
7
6
1
0
7
6
1
0
7
6
1
0
0
1
2
3
8
9
12
16 17 18
19
10 11
13 14 15
27 28
26
DATA +n
Figure 22. Control Port Timing, I2C Slave Mode Write
SCL
CHIP ADDRESS (WRITE)
MAP BYTE
DATA
DATA +1
START
ACK
STOP
ACK
ACK
ACK
0
0
1
0
0 AD1 AD0 0
SDA
0
0
1
0
0 AD1 AD0 1
CHIP ADDRESS (READ)
START
INCR
6
5
4
3
2
1
0
7
0
7
0
7
0
NO
16
8
9
12 13 14 15
4
5
6
7
0
1
20 21 22 23 24
26 27 28
2
3
10 11
17 18
19
25
ACK
REQ
DATA + n
Figure 23. Control Port Timing, I2C Slave Mode Read
SEND I2C START
WRITE ADDRESS BYTE
WITH R/W BIT = 0
GET ACK
SEND DATABYTE
MORE DATA?
N
Y
GET ACK
SEND I2C STOP
GET ACK
SEND MAP BYTE
Figure 21. I2C Slave Mode Write Flow Diagram



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