參數(shù)資料
型號(hào): 82845GL
廠商: INTEL CORP
元件分類: 外設(shè)及接口
英文描述: Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
中文描述: MULTIFUNCTION PERIPHERAL, PBGA760
封裝: 37.50 X 37.50 MM, 1 MM PITCH, FLIP CHIP, BGA-760
文件頁(yè)數(shù): 62/193頁(yè)
文件大小: 2990K
代理商: 82845GL
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Register Description
62
Intel
82845G/82845GL/82845GV GMCH Datasheet
3.5.1.18
DRT
DRAM Timing Register (Device 0)
Address Offset:
Default Value:
Access:
Size:
78–7Bh
00000000h
Read/Write
32 bits
This register controls the timing of the DRAM controller.
Bit
Description
31:18
Intel Reserved.
17:15
DRAM Idle Timer.
This field determines the number of clocks the SDRAM controller will remain in
the idle state before it begins pre-charging all pages.
000 =
Infinite
001 = 0
010 = 8 DRAM clocks
011 = 16 DRAM clocks
100 = 64 DRAM clocks
Others = reserved
14:12
Intel Reserved.
11
Activate to Precharge Delay (tRAS), MAX.
This bit controls the maximum number of clocks that a
DRAM (SDR or DDR) bank can remain open. After this time period, the DRAM controller will
guarantee to pre-charge the bank. Note that this time period may or may not be set to overlap with
time period that requires a refresh to happen.
The DRAM controller incudes a separate tRAS-MAX counter for every supported bank. With a
maximum of four row and four banks per row, there are 16 counters.
0 = 120
μ
s
1 = Reserved.
10:9
Activate to Precharge delay (tRAS), MIN.
This bit controls the number of DRAM clocks for tRAS
minimum.
00 = 8 Clocks
01 = 7 Clocks
10 = 6 Clocks
11 = 5 Clocks
8:7
Intel Reserved.
6:5
CAS# Latency (tCL).
Encoding
00
01
10
11
SDR CL
Reserved
3
2
Reserved
DDR CL
2.5
2
Reserved
Reserved
4
Intel Reserved.
3:2
DRAM RAS# to CAS# Delay (tRCD).
This bit controls the number of clocks inserted between a row
activate command and a read or write command to that row.
01 = 3 DRAM Clocks
10 = 2 DRAM Clocks
11 = Reserved
1:0
DRAM RAS# Precharge (tRP).
This bit controls the number of clocks that are inserted between a
row precharge command and an activate command to the same row.
00 = Intel Reserved
01 = 3 DRAM Clocks
10 = 2 DRAM Clocks
11 = Reserved
相關(guān)PDF資料
PDF描述
82845GV Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
82845Gx Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
82845MP Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845Mx Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845MZ Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
82845GV 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
82845GX 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
82845MP 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845MX 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)
82845MZ 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Intel 845 Family Chipset-Mobile 82845MP/82845MZ Chipset Memory Controller Hub Mobile (MCH-M)