- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄366550 > AM79C970 (Advanced Micro Devices, Inc.) PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus PDF資料下載
參數(shù)資料
| 型號： | AM79C970 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus |
| 中文描述： | PCnetTM - PCI單芯片以太網(wǎng)控制器的PCI總線 |
| 文件頁數(shù)： | 74/168頁 |
| 文件大小： | 943K |
| 代理商： | AM79C970 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁當(dāng)前第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁
P R E L I M I N A R Y
AMD
1-941
Am79C970
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.
Figure 28 shows the byte/bit ordering of the received
length field for an 802.3 compatible frame format.
Preamble
1010....1010
Sync
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
18220C-30
Figure 28. 802.3 Frame and Length Field Transmission Order
Receive FCS Checking
Reception and checking of the received FCS is per-
formed automatically by the PCnet-PCI controller. Note
that if the Automatic Pad Stripping feature is enabled,
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 padded 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
inRMD1.
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 controller are basically
collisions within the slot time and automatic runt packet
rejection. The PCnet-PCI controller will ensure that colli-
sions which occur within 512 bit times from the start of
reception (excluding preamble) will be automatically de-
leted from the receive FIFO with no host intervention.
The receive FIFO will delete any frame which is com-
posed of fewer than 64 bytes provided that the Runt
Packet Accept (RPA bit in CSR124) feature has not
been enabled. 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.
Abnormal network conditions include:
FCS errors
Late Collision
Host related receive exception conditions include MISS,
BUFF, and OFLO. These are described in the BMU
section.
Loopback Operation
Loopback is a mode of operation intended for system di-
agnostics. In this mode, the transmitter and receiver are
both operating at the same time so that the controller re-
ceives its own transmissions. The controller provides
two types of internal loopback and one type of external
loopback. In internal loopback mode, the transmitted
data can be looped back to the receiver at one of two
places inside the controller without actually transmitting
any data to the external network. The receiver will move
the received data to the next receive buffer, where it can
be examined by software. Alternatively, in external loop-
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C971VCW | PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
| AM79C971 | PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
| AM79C971KCW | IC LOGIC 16211 24-BIT FET BUS SWITCH -40+85C TSSOP-56 35/TUBE |
| AM79C972BKCW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BKIW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C970A | 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 |
| AM79C970AKC | 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 |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。