參數(shù)資料
型號： 82443ZX
廠商： INTEL CORP
元件分類： 存儲控制器/管理單元
英文描述： Intel㈢ 440ZX AGPset: Host Bridge/Controller
中文描述： DRAM CONTROLLER, PBGA492
封裝： BGA-492
文件頁數(shù)： 64/116頁
文件大?。?/td> 533K
代理商： 82443ZX
Register Description
3-40
82443ZX Host Bridge Datasheet
3.3.37
MBFS—Memory Buffer Frequency Select Register
(Device 0)
Address Offset:
Default Value:
Access:
Size:
CA–CCh
000000h
Read/Write
24 bits
The settings in this register enable the 100 MHz or 66 MHz buffers for each of the following signal
groups.
Note:
The choice of 100 MHz or 66 MHz buffer is independent of bus frequency. It is possible to select a
100 MHz memory buffer even though the bus frequency is 66 MHz (and vice versa).
Bit
Description
23
Reserved
22
MAA[13:0], WEA#, SRASA#, SCASA# (100 MHz/66 MHz buffer select bit).
This bit enables
either 100 MHz or 66 MHz buffers for MAA[13:0], WEA#, SRASA#, SCASA#.
0 = 66 MHz
1 = 100 MHz
21
Not Applicable in the 82443ZX
.
20
MD [63:0] (100 MHz/66 MHz buffer select bit [Control 2]).
This bit enables either 100 MHz or
66 MHz buffers for MD [63:0] [Control 2]. (Refer to the corresponding MBSC register for
programming details).
0 = 66 MHz
1 = 100 MHz
19
MD [63:0] (100 MHz/66 MHz buffer select bit [Control 1]).
This bit enables either 100 MHz or
66 MHz buffers for MD [63:0] [Control 1]. (Refer to the corresponding MBSC register for
programming details).
0 = 66 MHz
1 = 100 MHz
18:16
Not Applicable in the 82443ZX.
15
CSA7#/CKE3 (100 MHz/66 MHz buffer select bit).
This bit enables either 100 MHz or 66 MHz
buffers for CSA7#/CKE3.
0 = 66 MHz
1 = 100 MHz
14
Not Applicable in the 82443ZX
.
13
CSA6#/CKE2 (100 MHz/66 MHz buffer select bit).
This bit enables either 100 MHz or 66 MHz
buffers for CSA6#/CKE2.
0 = 66 MHz
1 = 100 MHz
12:11
Not Applicable in the 82443ZX.
10
CSA3#/RASA3#, CSB3#/RASB3# (100 MHz/66 MHz buffer select bit).
This bit enables either
100 MHz or 66 MHz buffers for CSA3#/RASA3#, CSB3#/RASB3#
.
0 = 66 MHz
1 = 100 MHz
9
CSA2#/RASA2#, CSB2#/RASB2# (100 MHz/66 MHz buffer select bit).
This bit enables either
100 MHz or 66 MHz buffers for CSA2#/RASA2#, CSB2#/RASB2#.
0 = 66 MHz
1 = 100 MHz
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