cy28359 Cypress Semiconductor Corporation., cy28359 Datasheet - Page 3

• Manufacturer Part Number: cy28359
• Description: 273-mhz 6-output Buffer For Ddr400 Dimms
• Manufacturer: Cypress Semiconductor Corporation.

Document #: 38-07636 Rev. **
Table 2. Block Read and Block Write Protocol
Table 3. Byte Read and Byte Write Protocol
20:27
29:36
38:45
20:27
11:18
11:18
Bit
2:8
2:8
Bit
10
19
28
37
46
....
....
....
....
....
....
10
19
28
29
1
9
1
9
Slave address – 7 bits
Command Code – 8 bits
Byte Count – 8 bits
Data byte 1 – 8 bits
Data byte 2 – 8 bits
Start
Write = 0
Acknowledge from slave
'00000000' stands for block operation
Acknowledge from slave
Acknowledge from slave
Acknowledge from slave
Acknowledge from slave
......................
Data Byte (N–1) – 8 bits
Acknowledge from slave
Data Byte N – 8 bits
Acknowledge from slave
Stop
Start
Slave address – 7 bits
Write = 0
Acknowledge from slave
Command Code – 8 bits
'1XXxxxxx' stands for byte operation,bit[6:5] for De-
vice selection bits for multiple device selection,
bits[4:0] of the command code represents the offset
of the byte to be accessed
Acknowledge from slave
Data byte from master – 8 bits
Acknowledge from slave
Stop
Block Write Protocol
Byte Write Protocol
Description
Description
PRELIMINARY
21:27
39:46
48:55
11:18
30:37
21:27
30:37
11:18
2:8
Bit
10
19
20
28
29
38
47
56
....
....
....
Bit
2:8
10
19
20
28
29
38
40
1
9
1
9
Start
Slave address – 7 bits
Write = 0
Acknowledge from slave
Command Code – 8 bits
'00000000' stands for block operation
Acknowledge from slave
Repeat start
Slave address – 7 bits
Read = 1
Acknowledge from slave
Byte count from slave – 8 bits
Acknowledge from master
Data byte from slave – 8 bits
Acknowledge from master
Data byte from slave – 8 bits
Acknowledge from master
Data byte N from slave – 8 bits
Acknowledge from master
Stop
Start
Slave address – 7 bits
Write = 0
Acknowledge from slave
'1XXxxxxx' stands for byte operation,bit[6:5] for
Device selection bits for multiple device selection,
bits[4:0] of the command code represents the off-
set of the byte to be accessed
Acknowledge from slave
Repeat start
Slave address – 7 bits
Read = 1
Acknowledge from slave
Data byte from slave – 8 bits
Acknowledge from master
Stop
Command Code – 8 bits
Block Read Protocol
Byte Read Protocol
Description
Description
CY28359
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