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參數(shù)資料
| 型號： | AM79C974KCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems |
| 中文描述： | 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP132 |
| 封裝： | PLASTIC, QFP-132 |
| 文件頁數(shù)： | 124/153頁 |
| 文件大?。?/td> | 838K |
| 代理商： | AM79C974KCW |
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AMD
P R E L I M I N A R Y
124
Am79C974
18681A-64
External SCSI-2
Bus Cable
External
Peripheral
High-Density
SCSI-2
Connectors
High-Density
SCSI-2
Termination
Am79C974
to PCI Bus
25
Connector for
Internal Peripheral
Termination
3-Pronged Bus
(not recommended)
stub
Bracketed card joining
ribbon cable with high-
density SCSI-2 cable
Figure E-2. A Poor Routing Scheme
The Motherboard
The following two layouts may be used as a guideline
for the design of motherboards which incorporate the
Am79C974. For both layouts, the SCSI connectors
should be placed as far away from the PCI Speedway as
possible. Each layout refers to termination considera-
tions which are described in further detail in the Termi-
nation Considerations section.
Layout #1
This approach avoids the cost of placing an external
connector on the motherboard. In this configuration, the
Am79C974 is always at one end of the SCSI bus, there-
fore, the regulated terminators remain active. This elimi-
nates the problem of switching the regulated
terminators on or off to accommodate peripheral con-
figurations. This approach also preserves the ideal
linear routing scheme. The following lists the require-
ments for implementation, while Figure E-3 illustrates
this approach.
One connector on the motherboard connected to
one end of the internal bus ribbon cable and its
components.
The other end of the internal bus ribbon cable con-
nected to one end of the external bus high density
cable and its peripherals via a bracketed add-on
card. The internal bus may also be crimped to a
SCSI connector mounted on a bracket.
On board regulated terminators a maximum of
0.1m (3.937 in) from the Am79C974.
External terminators connected to the end of the
external bus.
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相關(guān)代理商/技術(shù)參數(shù) |
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| AM79C975 | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY |
| AM79C975BKC\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C975BKC\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C975BKD\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C975BKD\W | 制造商:Advanced Micro Devices 功能描述:PCnet-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY 制造商:AMD (Advanced Micro Devices) 功能描述:PCnet-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY |
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