CY28RS400
Table 4. Block Read and Block Write Protocol (continued)
Block Write Protocol
Block Read Protocol
Description
Bit
27:20
28
Description
Bit
20
Byte Count – 8 bits
Repeat start
Acknowledge from slave
Data byte 1 – 8 bits
27:21
28
Slave address – 7 bits
Read = 1
36:29
37
Acknowledge from slave
Data byte 2 – 8 bits
29
Acknowledge from slave
Byte Count from slave – 8 bits
Acknowledge
45:38
46
37:30
38
Acknowledge from slave
Data Byte /Slave Acknowledges
Data Byte N –8 bits
....
46:39
47
Data byte 1 from slave – 8 bits
Acknowledge
....
....
Acknowledge from slave
Stop
55:48
56
Data byte 2 from slave – 8 bits
Acknowledge
....
....
Data bytes from slave / Acknowledge
Data Byte N from slave – 8 bits
NOT Acknowledge
....
....
Table 5. Byte Read and Byte Write Protocol
Byte Write Protocol
Byte Read Protocol
Description
Bit
1
Description
Bit
1
Start
Start
8:2
9
Slave address – 7 bits
Write
8:2
9
Slave address – 7 bits
Write
10
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Data byte – 8 bits
Acknowledge from slave
Stop
10
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Repeated start
18:11
19
18:11
19
27:20
28
20
27:21
28
Slave address – 7 bits
Read
29
29
Acknowledge from slave
Data from slave – 8 bits
NOT Acknowledge
Stop
37:30
38
39
Rev 1.0,November 22, 2006
Page 4 of 18
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