參數(shù)資料
型號(hào)： AM79C970AKC
廠商： ADVANCED MICRO DEVICES INC
元件分類： 微控制器/微處理器
英文描述： PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
中文描述： 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP13
封裝： CARRIER RING, PLASTIC, QFP-132
文件頁(yè)數(shù)： 79/219頁(yè)
文件大?。?/td> 1065K
代理商： AM79C970AKC
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P R E L I M I N A R Y
AMD
79
Am79C970A
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.
The figure below shows the byte/bit ordering of the re-
ceived length field for an 802.3 compatible frame format.
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
19436A-38
Figure 35. 802.3 Frame And Length Field Transmission Order
Since any valid Ethernet Type field value will always be
greater than a normal 802.3 Length field (
≥
46), the
PCnet-PCI II controller will not attempt to strip valid
Ethernet frames. Note that for some network protocols,
the value passed in the Ethernet Type and/or 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 PCnet-PCI II 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 RMD1.
Receive Exception Conditions
Exception conditions for frame reception fall into two
distinct categories: those which are the result of normal
network operation, and those which occur due to abnor-
mal network and/or host related events.
Normal events which may occur and which are handled
autonomously by the PCnet-PCI II controller are basi-
cally collisions within the slot time and automatic runt
packet rejection. The PCnet-PCI II controller will ensure
that collisions which occur within 512 bit times from the
start of reception (excluding preamble) will be automati-
cally deleted from the receive FIFO with no host inter-
vention. The receive FIFO will delete any frame which 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. This criterion will be met 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.
相關(guān)PDF資料
PDF描述
AM79C970A PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970AVCW PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970 PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
AM79C971VCW PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C970AKC\\W 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Advanced Micro Devices 功能描述:
AM79C970AKC\W 制造商:Rochester Electronics LLC 功能描述:- Bulk
AM79C970AKCW 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970AVC 制造商:Advanced Micro Devices 功能描述:
AM79C970AVC\\W 制造商:Advanced Micro Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:
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