參數(shù)資料
型號: 82815EM
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): 54/163頁
文件大?。?/td> 1049K
代理商: 82815EM
Intel
82815EM GMCH
R
54
Datasheet
3.6.17.
DRAMT—DRAM Timing Register (Device 0)
Address Offset:
53h
Default Value:
00h
Access:
Read/Write
Size:
8 bits
This register controls the operating mode and the timing of the DRAM Controller.
7
5
4
3
2
1
0
SDRAM Mode Select
DRAM
Cycle
Time
Reserved
Latency
SDRAM
RAS# to
CAS# Dly
SDRAM
RAS#
Precharge
Bit
Description
7:5
SDRAM Mode Select (SMS).
These bits select the operational mode of the GMCH2-M DRAM
interface. The special modes are intended for initialization at power up.
000 =
DRAM in Self-Refresh Mode
, Refresh Disabled (Default)
001 =
Normal
Operation
, 100Mhz System memory - Refresh interval 15.6 uSec
010 =
Normal
Operation
, 100Mhz System memory - Refresh interval 7.8
011 =
Normal
Operation
, 100Mhz System memory - Refresh interval 1.28 uSec
100 =
NOP Command Enable.
In this mode all processor cycles to SDRAM result in a NOP
Command.
101 =
All Banks Precharge Enable.
In this mode all processor cycles to SDRAM result in an All
Banks Precharge Command on the SDRAM interface.
110 =
Mode Register Set Enable.
In this mode all processor cycles to SDRAM result in a mode
register set command on the SDRAM interface. The Command is driven on the MA[12:0] lines. MA[2:0]
must always be driven to 010 for burst of 4 mode. MA3 must be driven to 1 for interleave wrap type.
MA4 needs to be driven to the value programmed in the CAS# Latency bit. MA[6:5] should always be
driven to 01. MA[12:7] must be driven to 00000. BIOS must calculate and drive the correct host
address for each row of memory such that the correct command is driven on the MA[12:0] lines.
Note
that MAB[7:4]# are inverted from MAA[7:4]; BIOS must account for this.
111 =
CBR Enable.
In this mode all processor cycles to SDRAM result in a CBR cycle on the SDRAM
interface.
4
DRAM Cycle Time (DCT).
This bit controls the number of SCLKs for an access cycle.
0 = Tras = 5 SCLKs & Trc = 7 SCLKs (Default)
1 = Tras = 7 SCLKs & Trc = 9 SCLKs.
3
Intel
Reserved.
2
CAS# Latency (CL).
This bit controls the number of CLKs between when a read command is sampled
by the SDRAMs and when GMCH2-M samples read data from the SDRAMs. 0 = CAS# latency is 3
SCLKs.
1 = CAS# latency is 2 SCLKs.
1
SDRAM RAS# to CAS# Delay (SRCD).
This bit controls the number of SCLKs from a Row Activate
command to a read or write command.
0 = 3 clocks will be inserted between a row activate command and either a read or write command.
1 = 2 clocks will be inserted between a row activate and either a read or write command.
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