參數(shù)資料
型號: 82803AAMRH-R
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù): 36/52頁
文件大?。?/td> 322K
代理商: 82803AAMRH-R
82803AA MRH-R
R
Datasheet
36
4.1.4.1.
SIO Request Packet for SPD Random Read
The SIO request packet format for the SPD EEPROM Random Read command is shown below.
Figure 13. SMBUS SIO Random Read Request Packet Format
smbus_rd_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
Reserved
0
ExSCK
ExSRQ
ExSA
ExSD
ExSINT
xSD[7:0] = Byte Address
After receiving the SPDR command from the MCH, the MRH-R generates two command sequences to
the addressed SPD EEPROM. The first command sequence is for writing an 8 bit address to the SPD
EEPROM specified by the slave address. The second command is to read the data from the address
written by the previous command. The data read from the SPD EEPROM is placed in the SPDRDR
register. Bit 15 of this register indicates whether data contained in the SPDRDR register is valid or not.
The BIOS can do an MRH-R register read operation to retrieve the data from the SPDRDR register. Bit
15 of the SPDRDR register is reset when the SPDRDR register is read by MCH.
The following figures show the SPDR command sequence from the MCH and the subsequent SMBUS
transactions by the MRH-R.
Figure 14. SPDR Command sequence
spdr_cmd
ExSCK
ExCmd
ExSIO
0
3
2
1
4
20
SPDR
SRA
SD
SINT
36
52
68
Figure 15. SMBUS Transactions to Read EEPROM
smbus_trans_rd
S
T
A
R
T
SMBDATA
S
T
A
R
T
S
T
A
R
T
Slave Address
(write)
Byte Address n
Slave Address
(Read)
A
C
K
A
C
K
A
C
K
S
T
O
P
N
A
C
K
S
T
O
P
Data n
MRH
EEPROM
W
R
I
T
E
R
E
A
D
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