參數(shù)資料
型號(hào)： AM79C976
廠商： Advanced Micro Devices, Inc.
英文描述： PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
中文描述： PCnet -專業(yè)⑩個(gè)10/100Mbps PCI以太網(wǎng)控制器
文件頁(yè)數(shù)： 73/309頁(yè)
文件大?。?/td> 2070K
代理商： AM79C976
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8/01/00
Am79C976
73
P R E L I M I N A R Y
%%%14!<+!
Since any valid Ethernet Type field value will always be
greater than a normal IEEE 802.3 Length field (
46),
the Am79C976 controller will not attempt to strip valid
Ethernet frames.
Note that for some network protocols,
the value passed in the Ethernet Type and/or IEEE
802.3 Length field is not compliant with either standard
and may cause problems if pad stripping is enabled
.
(+(7
Reception and checking of the received FCS is per-
formed automatically by the Am79C976 controller.
Note that if the Automatic Pad Stripping feature is en-
abled, the FCS for padded frames will be verified
against the value computed for the incoming bit stream
including pad characters, but the FCS value for a pad-
ded frame will not be passed to the host. If an FCS
error is detected in any frame, the error will be reported
in the CRC bit in the Receive Descriptor.
(%&('
Exception conditions for frame reception fall into two
categories, i.e., those conditions which are the result of
normal network operation, and those which occur due
to abnormal network and/or host related events.
Normal exception events are caused by collisions,
which can distort and truncate received frames.
Frames shorter than 64 bytes will, by default, be dis-
carded. These fragments will be discarded regardless
of whether the receive frame was the first (or only)
frame in the FIFO or if the receive frame was queued
behind a previously received message.
There are two control bits that can be used to cause the
MAC to override normal behavior and accept all frames
that pass address match, regardless of the frame
length. Setting the Runt Packet Accept (RPA) bit
(CMD2, bit 19) causes the MAC to accept runt packets
when the device is operating in either half- or full-du-
plex mode. Setting Full-Duplex Runt Packet Accept
(FDRPA, CMD2, bit 20) causes the MAC to accept runt
packets when the device is operating in full-duplex
mode. (When the value of RPA is 1, runt packets are
accepted regardless of the duplex mode or the value of
FDRPA.) In either case, there is a minimum frame size
of 16 bytes. Frames shorter than this may not be ac-
cepted, regardless of the value of RPA or FDRPA.
Abnormal network conditions include:
I
I
I
These error conditions are reported in the correspond-
ing receive descriptors. The RcvFCSErrors, RcvAlign-
mentErrors, or RcvMissPkts counter is also
incremented when one of these events occurs.
Statistics Counters
In order to provide network management information
with minimum host CPU overhead, the Am79C976 de-
vice automatically maintains a set of 32-bit controller
statistics counters. These counters are mapped di-
Preamble
1010....1010
SFD
10101011
Destination
Address
Source
Address
Length
LLC
Data
Pad
FCS
4
Bytes
46
–
1500
Bytes
2
Bytes
6
Bytes
6
Bytes
8
Bits
56
Bits
Start of Frame
at Time = 0
Increasing Time
Bit
0
Bit
7
Bit
0
Bit
7
Most
Significant
Byte
Least
Significant
Byte
1
–
1500
Bytes
45
–
0
Bytes
相關(guān)PDF資料
PDF描述
AM79C976KIW PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
AM79C976KCW PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
AM79C978AKCW Single-Chip 1/10 Mbps PCI Home Networking Controller
AM79C978AVCW Single-Chip 1/10 Mbps PCI Home Networking Controller
AM79C978 Single-Chip 1/10 Mbps PCI Home Networking Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C976KC 制造商:Rochester Electronics LLC 功能描述:METRIC PLASTIC QUAD-RING - Bulk
AM79C976KCW 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
AM79C976KD 制造商:Advanced Micro Devices 功能描述:ETHERNET:MEDIA ACCESS CONTROLLER (MAC)
AM79C976KF 制造商:Advanced Micro Devices 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP 制造商:AMD (Advanced Micro Devices) 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP
AM79C976KI 制造商:Advanced Micro Devices 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP 制造商:AMD (Advanced Micro Devices) 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP
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