參數(shù)資料
型號(hào): 82443ZX
廠商: INTEL CORP
元件分類: 存儲(chǔ)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): 104/116頁
文件大?。?/td> 533K
代理商: 82443ZX
Functional Description
4-24
82443ZX Host Bridge Datasheet
4.8.2.1
CPU Reset
The CPU reset is generated by the 82443ZX in the following case:
CPURST# is always asserted if PCIRST# is asserted.
CPURST# is asserted during resume sequence from POS
CRst_En= 1.
The 82443ZX deasserts CPURST# 1 ms after detecting the rising edge of PCIRST#. The
CPURST# is synchronous to host bus clock.
4.8.2.2
CPU Clock Ratio Straps
The Pentium II processors require their internal clock ratio to be set up via strapping pins
multiplexed onto signals A20M#, IGNE#, INTR, and NMI. These signals should reflect the
strapping values during the deasserted edge of CPURST# signal and be held stable for between 2 to
20 clocks. HCLKs after CPURST# is deasserted.
The 82443ZX is designed to support CPU strapping options with external logic, when PIIX4E is
used. Figure 4-4 illustrates the strapping pin timing when using the external glue logic (necessary
for PIIX4E). The external mux is switched via the CRESET# signal which is a 2 clock delayed
version of CPURST#.
4.8.2.3
82443ZX Straps
The 82443ZX strapping options are latched in the rising edge of PCIRST#.
Figure 4-3. Reset CPURST# in a Desktop System When PCIRST# Asserted
1
....
2
HCLK
PCIRST#
PCLK
CPURST#
CRESET#
0
0
0
0
1m SEC
Figure 4-4. External Glue Logic Drives CPU Clock Ratio Straps
1
2
1 ms
1
33,333
....
2
HCLK
SUS_DIS strap
CPU strap values from external Glue Logic
Suspend disable value latched when PCIRST#
PCIRST#
PCLK
CRESET#
CPU straps
p_creset#
0
0
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