CY28401
Table 2. Block Read and Block Write Protocol (continued)
Block Write Protocol
Block Read Protocol
Description
Acknowledge from slave
Bit
10
Description
Acknowledge from slave
Bit
10
11:18
Command Code – 8 bits
'00000000' stands for block operation
11:18
Command Code – 8 bits
'00000000' stands for block operation
19
20:27
28
Acknowledge from slave
Byte Count from master – 8 bits
Acknowledge from slave
Data byte 0 from master – 8 bits
Acknowledge from slave
Data byte 1 from master – 8 bits
Acknowledge from slave
Data bytes from master/Acknowledge
Data Byte N – 8 bits
19
20
Acknowledge from slave
Repeat start
21:27
28
Slave address – 7 bits
Read = 1
29:36
37
29
Acknowledge from slave
Byte count from slave – 8 bits
Acknowledge from host
Data byte 0 from slave – 8 bits
Acknowledge from host
Data byte 1 from slave – 8 bits
Acknowledge from host
Data bytes from slave/Acknowledge
Data byte N from slave – 8 bits
Acknowledge from host
Stop
38:45
46
30:37
38
....
39:46
47
....
....
Acknowledge from slave
Stop
48:55
56
....
....
....
....
....
Table 3. Byte Read and Byte Write Protocol
Byte Write Protocol
Byte Read Protocol
Description
Bit
1
Description
Bit
Start
1
2:8
9
Start
2:8
9
Slave address – 7 bits
Write = 0
Slave address – 7 bits
Write = 0
10
Acknowledge from slave
10
Acknowledge from slave
11:18
Command Code – 8 bits
11:18 Command Code – 8 bits
'100xxxxx' stands for byte operation, bits[6:0]
'100xxxxx' stands for byte operation, bits[6:0] of the
command code represents the offset of the byte to be
accessed
of the command code represents the offset of
the byte to be accessed
19
20:27
28
Acknowledge from slave
Data byte from master – 8 bits
Acknowledge from slave
Stop
19
20
Acknowledge from slave
Repeat start
21:27 Slave address – 7 bits
29
28
29
Read = 1
Acknowledge from slave
30:37 Data byte from slave – 8 bits
38
39
Acknowledge from master
Stop
Byte 0: Control Register 0
Bit
@pup
Name
Description
7
0
PWRDWN# drive mode
0 = Driven when stopped, 1 = Three-state
6
0
SRC_STOP# drive mode
0 = Driven when stopped, 1 = Three-state
Rev 1.0,November 21, 2006
Page 3 of 13
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