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參數(shù)資料
| 型號： | Z684 |
| 英文描述： | FUSE 3A/125V SUB-MINIATURE PICO |
| 中文描述： | 控制器雜項-數(shù)據(jù)表參考 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大小： | 129K |
| 代理商： | Z684 |
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I
Z684 PCI Bus Controller
I
9
OKI SEMICONDUCTOR
FUNCTIONAL DESCRIPTION
First introduced in 1992, the PCI bus offers high bandwidth and operates independently of the host CPU.
As a result, the PCI bus has become widely accepted in the PC industry.
Figure 206
shows one of the most common configurations of a PCI bus system.
In the example above, there are three bus protocols: the CPU host bus, the PCI bus, and the ISA/ EISA bus
protocols. The system uses a bus bridge to provide a communication between the buses. The bus bridge
converts one bus protocol to another. The host/ PCI bridge provides protocol linkage between a CPU host
and the PCI bus. The PCI and ISA/ EISA bus linkage is provided by the PCI-to-ISA/ EISA bridge. With
this system configuration, high-bandwidth PCI modules (either add-on cards or IC devices) can be con-
nected to the PCI bus. The reader is recommended to consult the latest PCI specification for more detail.
The OKI Z684 provides an interface between the customer's application module and the PCI bus. The
Z684 can be integrated into a customer's design and allows the integrated device to connect directly to the
PCI bus. Alternatively, the Z684 can be used in a chip on a PCI daughtercard.
one of the most common applications of the Z684. In this application, a customer's module is integrated
with the Z684. A PCI I/ O buffer block that converts the Z684 unidirectional signals to bidirectional PCI
bus signals is also shown in
Figure 205
on page 3.
Figure 205
on page 3 shows
The customer application module may initiate a transaction or operation as the master for another PCI
device. As an initiator of a PCI transaction, the module sends all necessary signals and data to the Z684;
the Z684 then handles the rest of the transaction. As a target of a PCI transaction, the module receives data
and all necessary signals from the Z684; the complex PCI control and scheduling are handled completely
by the Z684. The following sections provide more detail on each component.
Customer Application Module (“Module”)
By using an i486-like module/ Z684 interface bus protocol, the Z684 can be integrated into any customer-
designed module. The integration is limited only by the available gates and I/ O pins in the array. The
CPU
PCI
Device 1
PCI
Device 2
PCI
Device 3
Host/PCI Bridge
PCI to ISA/EISA
Bridge
Host Bus
PCI Bus
ISA Bus or EISA Bus
Figure 206. PCI System Configuration
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