參數(shù)資料
型號: AM79C974
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
中文描述: PCnetTM -的SCSI結(jié)合以太網(wǎng)和SCSI控制器PCI系統(tǒng)
文件頁數(shù): 125/153頁
文件大小: 838K
代理商: AM79C974
AMD
P R E L I M I N A R Y
125
Am79C974
18681A-65
CPU
MEMORY
External
Peripheral
High-Density
SCSI-2
Termination
High-Density
SCSI-2
Connector
Keyboard
Connector
Bracketed card
joining ribbon cable
with high-density
SCSI-2 cable
External SCSI-2 Bus Cable
Internal SCSI bus cable
Connector for
Internal Peripheral
To DC Power
Ferrite Bead
To SCSI CLK1
and CLK2
Am79C974
to PCI Bus
always on
25
T
Figure E-3. Motherboard Layout — Approach #1
Layout #2
This approach uses a “pizza-box” type of motherboard,
which has been incorporated into PC systems and work-
stations. This design reduces the system’s height so
that its casing resembles a pizza box. This is partly the
result of a riser card that enables cards to rest on their
side instead of upright. This approach requires the fol-
lowing and is illustrated in Figure E-4:
An external connector mounted on the mothe-
rboard with routings that connect to the
Am79C974.
The Am79C974 must be as close as possible to
this external connector since this part of the SCSI
bus consists of motherboard routings (not just rib-
bon cable).
An internal connector on the motherboard to ac-
commodate internal drives.
On-board regulated terminators for SCSI drives
not mounted within the system. However, should
the user decide to connect a drive internally, termi-
nators are not needed.
If on-board regulated terminators are used, they
should be placed within .1 m (3.937 in) from the
Am79C974.
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