參數(shù)資料
型號(hào)： AM79C975KCW
廠商： ADVANCED MICRO DEVICES INC
元件分類： 微控制器/微處理器
英文描述： PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
中文描述： 5 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP16
封裝： PLASTIC, QFP-160
文件頁(yè)數(shù)： 77/304頁(yè)
文件大?。?/td> 2092K
代理商： AM79C975KCW
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Am79C973/Am79C975
77
P R E L I M I N A R Y
The number of bytes to be stripped is calculated from
the embedded length field (as defined in the ISO 8802-
3 (IEEE/ANSI 802.3) definition) contained in the frame.
The length indicates the actual number of LLC data
bytes contained in the message. Any received frame
which contains a length field less than 46 bytes will have
the pad field stripped (if ASTRP_RCV is set). Receive
frames which have a length field of 46 bytes or greater
will be passed to the host unmodified.
Figure 34 shows the byte/bit ordering of the received
length field for an IEEE 802.3-compatible frame format.
Figure 34. IEEE 802.3 Frame And Length Field Transmission Order
Since any valid Ethernet Type field value will always be
greater than a normal IEEE 802.3 Length field (
46),
the Am79C973/Am79C975 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
.
Receive FCS Checking
Reception and checking of the received FCS is per-
formed automatically by the Am79C973/Am79C975
controller. Note that if the Automatic Pad Stripping fea-
ture is enabled, the FCS for padded frames will be ver-
ified against the value computed for the incoming bit
stream including pad characters, but the FCS value for
a padded frame will not be passed to the host. If an
FCS error is detected in any frame, the error will be re-
ported in the CRC bit in RMD1.
Receive Exception Conditions
Exception conditions for frame reception fall into two
distinct 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 events which may occur and which are handled
autonomously by the Am79C973/Am79C975 controller
are basically collisions within the slot time and auto-
matic runt packet rejection. The Am79C973/
Am79C975 controller will ensure that collisions that
occur within 512 bit times from the start of reception
(excluding preamble) will be automatically deleted from
the receive FIFO with no host intervention. The receive
FIFO will delete any frame that is composed of fewer
than 64 bytes provided that the Runt Packet Accept
(RPA bit in CSR124) feature has not been enabled and
the network interface is operating in half-duplex mode,
or the full-duplex Runt Packet Accept Disable bit (FDR-
PAD, BCR9, bit 2) is set. This criterion will be met re-
gardless 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.
Abnormal network conditions include:
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
21510D-39
相關(guān)PDF資料
PDF描述
AM79C973VCW PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
AM79C975VCW PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
AM79C976 PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
AM79C976KIW PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
AM79C976KCW PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C975VCW 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
AM79C976 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
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)
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