參數(shù)資料
型號: 82439TX
廠商: INTEL CORP
元件分類: 存儲控制器/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): 27/83頁
文件大?。?/td> 461K
代理商: 82439TX
E
3.1.14.
82439TX (MTXC)
27
PRELIMINARY
PCON
PCI CONTROL REGISTER
Address Offset:
Default Value:
Access:
50h
00h
Read/Write
The PCON Register enables and disables features related to the PCI bus that are not already covered in the
required PCI space.
Bit
Description
7:4
Reserved.
3
PCI Concurrency Enable (PCE).
1=CPU can access DRAM and L2 while a non-PIIX4 PCI master
is targeting Peer PCI devices. 0 (default)=CPU is held off of the bus during all PCI master cycles.
This bit should be set to 1 by BIOS during normal operation
.
2:0
Reserved.
3.1.15.
CC
CACHE CONTROL REGISTER
Address Offset:
Default Value:
Access:
52h
SSSS0010 (S=Strapping option)
Read/Write
This 8-bit register defines the secondary cache operations. The CC register enables and disables the second
level cache, adjusts cache size, selects the cache write policy, selects the caching policy when CACHE# is
negated on reads, informs the MTXC how the SRAMs are connected, and defines the cache SRAM type. After a
hard reset, CC[7:4] reflect the signal levels on the Host address lines A[31:28].
Bit
Description
7:6
Secondary Cache Size (SCS)
.
This field reflects the inverted signal level on the A[31:30] pins at the
rising edge of the RESET signal. The options are:
Bits[7:6]
Secondary Cache Size
00
01
10
11
Cache not populated
256 Kbytes
512 Kbytes
Reserved
The RESET values can be overwritten with subsequent writes to the CC Register.
NOTE
1.
2.
When bits[7:6]=00, the secondary cache is disabled.
When bits[7:6]
00, the FLCE bit must also be set to 1 (L2 cache cannot be enabled
unless the L1 cache is also enabled).
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