參數(shù)資料
型號(hào): 82803AAMRH-R
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器雜項(xiàng)-數(shù)據(jù)表參考
文件頁數(shù): 37/52頁
文件大?。?/td> 322K
代理商: 82803AAMRH-R
82803AA MRH-R
R
Datasheet
37
4.1.4.2.
SIO Request Packet for SPD Write Command
The SIO request packet format for the SPD EEPROM Write command is shown below.
Figure 16. SMBUS SIO Random Write Request Packet Format
smbus_wr_req
Reserved
2
1
0
5
4
3
8
7
6
11
10
9
14
13
12
15
xSOP[3:0]
0
xC[4:0]
Reserved
xSA[7:0] = Slave Address
xSD[15:8] = Write Data
0
ExSCK
ExSRQ
ExSA
ExSD
ExSINT
xSD[7:0] = Byte Address
After receiving the SPDW command from the MCH, the MRH-R generates a write command sequence
to the addressed SPD EEPROM as shown below
.
The MRH-R sets bit 14 of the SPDRDR register when
the SPDW command is successfully completed by the MRH-R. BIOS should check this bit before
sending a new command to the SPD EEPROM.
The following figures show the SPDW command sequence from the MCH and the subsequent SMBUS
transactions by the MRH-R.
Figure 17. SPDW Command sequence
spdw_cmd
ExSCK
ExCmd
ExSIO
0
3
2
1
4
20
SPDW
SRA
SD
SINT
36
52
68
Figure 18. SMBUS Transactions to Write to EEPROM
smbus_trans_wr
S
T
A
R
T
SMBDATA
S
T
A
R
T
Slave Address
Byte Address
Data
A
C
K
A
C
K
A
C
K
S
T
O
P
S
T
O
P
MRH
EEPROM
W
R
I
T
E
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