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參數(shù)資料
| 型號： | 21050-AA |
| 英文描述： | PCI Bus Interface/Controller |
| 中文描述： | PCI總線接口/控制器 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大小： | 92K |
| 代理商： | 21050-AA |
21050 PCI-to-PCI Bridge Hardware Implementation
12
Application Note
5.2
Controlling Write Posting
You can also configure the 21050 to always enable or always disable write posting.
For example:
If s_bufne_l status is not used and write posting is always enabled:
— Tie s_dispst_l high through a 1K resistor.
— Leave s_bufne_l floating.
If s_bufne_l status is not used and write posting is always disabled:
— Tie s_dispst_l low through a 1K resistor.
— Leave s_bufne_l floating.
— Set the Disable Posting bit in the 21050 configuration space [Cfg Addr 40 (hex), bit 1].
5.3
Interrupt Binding on Option Cards
When PCI-PCI Bridges are used in option cards, a binding is required by the
PCI-to-PCI Bridge
Architecture Specification
between the device number (as given in the Type 1 configuration
address and, therefore, the IDSEL line) and the INTx# line it uses when requesting an interrupt.
The PCI connector has only four interrupt lines assigned to it: INTA#, INTB#, INTC#, and INTD#.
Multiple devices might have to share these lines.
Since only the BIOS knows how the PCI INTx# lines are routed to the system interrupt controller,
a mechanism is required to inform the device driver of which IRQ its device will request an
interrupt on. The interrupt line register stores this information. The BIOS code assumes the binding
as listed in
Table 2
behind a PCI-PCI Bridge and writes the IRQ number in each device. The
interrupt binding defined in
Table 2
is mandatory for option cards utilizing PCI-PCI Bridges.
Table 2. Interrupt Binding on Option Cards
Device Number on Secondary Bus
Interrupt Pin on Device
Interrupt Pin on Connector
0, 4, 8, 12, 16, 20, 24, 28
INTA#
INTB#
INTC#
INTD#
INTA#
INTB#
INTC#
INTD#
1, 5, 9, 13, 17, 21, 25, 29
INTA#
INTB#
INTC#
INTD#
INTB#
INTC#
INTD#
INTA#
2, 6, 10, 14, 18, 22, 26, 30
INTA#
INTB#
INTC#
INTD#
INTC#
INTD#
INTA#
INTB#
3, 7, 11, 15, 19, 23, 27, 31
INTA#
INTB#
INTC#
INTD#
INTD#
INTA#
INTB#
INTC#
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 21052-AA | PCI Bus Interface/Controller |
| 21052-AB | PCI Bus Interface/Controller |
| 210600 | KABEL PROFI 3FACH KOAX 75 OHM SW 100M |
| 210602 | KABEL PROFI 3FACH KOAX 75 OHM GRAU 100M |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 21050AB | 功能描述:IC PCI-PCI BRIDGE 208QFP RoHS:否 類別:集成電路 (IC) >> 接口 - 專用 系列:- 特色產(chǎn)品:NXP - I2C Interface 標準包裝:1 系列:- 應用:2 通道 I²C 多路復用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
| 21050-AB | 制造商:Intel 功能描述:IC,BUS CONTROLLER,CMOS,QFP,208PIN |
| 21050D401R00JE | 制造商:OHMITE 制造商全稱:Ohmite Mfg. Co. 功能描述:Dividohm? Vitreous Enamel Adjustable Power |
| 21050D401R00KE | 制造商:OHMITE 制造商全稱:Ohmite Mfg. Co. 功能描述:Dividohm? Vitreous Enamel Adjustable Power |
| 21050D40250RJE | 制造商:OHMITE 制造商全稱:Ohmite Mfg. Co. 功能描述:Dividohm? Vitreous Enamel Adjustable Power |
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