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): 127/153頁
文件大小: 838K
代理商: AM79C974
AMD
P R E L I M I N A R Y
127
Am79C974
From an EMI standpoint, SCSI-2 high-density ca-
bles should be used instead of a SCSI-1 cables.
Unlike the SCSI-1 flat ribbon cable, the SCSI-2
cable is electrically more substantial. It is shielded
and signal wires are strategically placed for better
signal travel.
Decoupling Methods
As stated in Appendix C, decoupling capacitors should
be used across the V
DD
and V
SS
pins on the motherboard
There are pairs of V
DD
and V
SS
pins on the Am79C974
that should each have their own decoupling capacitor.
The following decoupling method should be used for the
V
DD
/V
SS
pairs:
Connect the capacitor directly between a V
DD
/V
SS
pair of the Am79C974 so that it sits on the compo-
nent side of the board. This configuration will allow
the capacitor to filter undesired high frequency
components directly at the Am79C974 and not
only at the power planes. This not only minimizes
the noise on the power planes that the chip sees,
but it also filters any noise generated by the chip
before it reaches the power planes. The leads to
each end of the capacitor should be wide and may
contain several feed-throughs to the V
DD
and V
SS
planes to reduce the inductance present. Refer to
Figure E-5.
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