參數(shù)資料
型號(hào): 82439TX
廠商: INTEL CORP
元件分類: 存儲(chǔ)控制器/管理單元
英文描述: System Controller(系統(tǒng)控制器)
中文描述: 256M X 8, DRAM CONTROLLER, PBGA324
封裝: BGA-324
文件頁數(shù): 39/83頁
文件大?。?/td> 461K
代理商: 82439TX
E
82439TX (MTXC)
39
PRELIMINARY
SIMM-0 Front
SIMM-0 Back
SIMM-1 Back
SIMM-3 Front
SIMM-3 Back
SIMM-2 Front
SIMM-2 Back
RAS3#
RAS2#
RAS1#
RAS0#
CAS7#
CAS6#
CAS5#
CAS4#
CAS3#
CAS2#
CAS1#
CAS0#
DRB1
DRB2
DRB3
SIMM-1 Front
DRB0
SIMM-5 Front
SIMM-5 Back
SIMM-4 Front
SIMM-4 Back
RAS5#
RAS4#
DRB4
DRB5
simm_drb
Figure 3. SIMMs and Corresponding DRB Registers
The following 2 examples describe how the DRB Registers are programmed for cases of single-sided and
double-sided SIMMs on a motherboard having a total of four 8-byte or eight 4-byte SIMM sockets.
Example #1
The memory array is populated with four single-sided 1 MB x 32 SIMMs, a total of 16 MBytes of DRAM. Two
SIMMs are required for each populated row making each populated row 8 Mbytes in size.
DRB0=02h
DRB1=04h
DRB2=04h
DRB3=04h
DRB4=04h
DRB5=04h
populated (2 SIMMs, 8 Mbytes this row)
populated (2 SIMMs, 8 Mbytes this row)
empty row
empty row
empty row
empty row
Example #2
As an another example, the memory array is populated with two 2 Mbytes x 32 double-sided SIMMs (one row),
and four 4 Mbytes x 32 single-sided SIMMs (two rows), yielding a total of 96 Mbytes of DRAM. The DRB
Registers are programmed as follows:
DRB0=04h
DRB1=08h
DRB2=10h
DRB3=18h
DRB4=18h
DRB5=18h
populated with 16 Mbytes, 1/2 of double-sided SIMMs
the other 16 Mbytes of the double-sided SIMMs
populated with 32 Mbytes, one of the sided SIMMs
the other 32 Mbytes of single-sided SIMMs
empty row
empty row
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參數(shù)描述
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