cy28551-3 Cypress Semiconductor Corporation., cy28551-3 Datasheet - Page 5

• Manufacturer Part Number: cy28551-3
• Description: Universal Clock Generator For Intel, Via And Sis
• Manufacturer: Cypress Semiconductor Corporation.

Document #: 001-05677 Rev. *D
The block write and block read protocol is outlined in Table 2
while Table 3 outlines the corresponding byte write and byte
read protocol. The slave receiver address is 11010010 (D2h).
Table 1. Command Code Definition
Table 2. Block Read and Block Write Protocol
Table 3. Byte Read and Byte Write Protocol
18:11
27:20
36:29
45:38
18:11
27:20
(6:0)
8:2
8:2
Bit
Bit
Bit
10
19
28
37
46
....
....
....
....
10
19
28
29
1
9
1
9
7
Start
Slave address – 7 bits
Write
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Byte Count – 8 bits
(Skip this step if I
Acknowledge from slave
Data byte 1 – 8 bits
Acknowledge from slave
Data byte 2 – 8 bits
Acknowledge from slave
Data Byte/Slave Acknowledges
Data Byte N – 8 bits
Acknowledge from slave
Stop
Start
Slave address – 7 bits
Write
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Data byte – 8 bits
Acknowledge from slave
Stop
0 = Block read or block write operation, 1 = Byte read or byte write operation
Byte offset for byte read or byte write operation. For block read or block write operations, these bits should be
'0000000'
Block Write Protocol
Byte Write Protocol
2
C_EN bit set)
Description
Description
Description
27:21
37:30
46:39
55:48
18:11
27:21
18:11
Bit
8:2
10
19
20
28
29
38
47
56
....
....
....
....
8:2
Bit
10
19
20
28
1
9
1
9
Acknowledge
Start
Slave address – 7 bits
Write
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Repeat start
Slave address – 7 bits
Read = 1
Acknowledge from slave
Byte Count from slave – 8 bits
Data byte 1 from slave – 8 bits
Acknowledge
Data byte 2 from slave – 8 bits
Acknowledge
Data bytes from slave/Acknowledge
Data Byte N from slave – 8 bits
NOT Acknowledge
Stop
Start
Slave address – 7 bits
Write
Acknowledge from slave
Command Code – 8 bits
Acknowledge from slave
Repeated start
Slave address – 7 bits
Read
Block Read Protocol
Byte Read Protocol
Description
Description
CY28551-3
Page 5 of 29
[+] Feedback