- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄366550 > AM79C971VCW (ADVANCED MICRO DEVICES INC) PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus PDF資料下載
參數(shù)資料
| 型號(hào)： | AM79C971VCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
| 中文描述： | 4 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP176 |
| 封裝： | TQFP-176 |
| 文件頁(yè)數(shù)： | 238/265頁(yè) |
| 文件大?。?/td> | 3190K |
| 代理商： | AM79C971VCW |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)第120頁(yè)第121頁(yè)第122頁(yè)第123頁(yè)第124頁(yè)第125頁(yè)第126頁(yè)第127頁(yè)第128頁(yè)第129頁(yè)第130頁(yè)第131頁(yè)第132頁(yè)第133頁(yè)第134頁(yè)第135頁(yè)第136頁(yè)第137頁(yè)第138頁(yè)第139頁(yè)第140頁(yè)第141頁(yè)第142頁(yè)第143頁(yè)第144頁(yè)第145頁(yè)第146頁(yè)第147頁(yè)第148頁(yè)第149頁(yè)第150頁(yè)第151頁(yè)第152頁(yè)第153頁(yè)第154頁(yè)第155頁(yè)第156頁(yè)第157頁(yè)第158頁(yè)第159頁(yè)第160頁(yè)第161頁(yè)第162頁(yè)第163頁(yè)第164頁(yè)第165頁(yè)第166頁(yè)第167頁(yè)第168頁(yè)第169頁(yè)第170頁(yè)第171頁(yè)第172頁(yè)第173頁(yè)第174頁(yè)第175頁(yè)第176頁(yè)第177頁(yè)第178頁(yè)第179頁(yè)第180頁(yè)第181頁(yè)第182頁(yè)第183頁(yè)第184頁(yè)第185頁(yè)第186頁(yè)第187頁(yè)第188頁(yè)第189頁(yè)第190頁(yè)第191頁(yè)第192頁(yè)第193頁(yè)第194頁(yè)第195頁(yè)第196頁(yè)第197頁(yè)第198頁(yè)第199頁(yè)第200頁(yè)第201頁(yè)第202頁(yè)第203頁(yè)第204頁(yè)第205頁(yè)第206頁(yè)第207頁(yè)第208頁(yè)第209頁(yè)第210頁(yè)第211頁(yè)第212頁(yè)第213頁(yè)第214頁(yè)第215頁(yè)第216頁(yè)第217頁(yè)第218頁(yè)第219頁(yè)第220頁(yè)第221頁(yè)第222頁(yè)第223頁(yè)第224頁(yè)第225頁(yè)第226頁(yè)第227頁(yè)第228頁(yè)第229頁(yè)第230頁(yè)第231頁(yè)第232頁(yè)第233頁(yè)第234頁(yè)第235頁(yè)第236頁(yè)第237頁(yè)當(dāng)前第238頁(yè)第239頁(yè)第240頁(yè)第241頁(yè)第242頁(yè)第243頁(yè)第244頁(yè)第245頁(yè)第246頁(yè)第247頁(yè)第248頁(yè)第249頁(yè)第250頁(yè)第251頁(yè)第252頁(yè)第253頁(yè)第254頁(yè)第255頁(yè)第256頁(yè)第257頁(yè)第258頁(yè)第259頁(yè)第260頁(yè)第261頁(yè)第262頁(yè)第263頁(yè)第264頁(yè)第265頁(yè)
D-2
Am79C971
Setup
The driver should set up descriptors in groups of three,
with the OWN and STP bits of each set of three de-
scriptors to read as follows: 11b, 10b, 00b.
An option bit (LAPPEN) exists in CSR3, bit position 5;
the software should set this bit. When set, the LAPPEN
bit directs the Am79C971 controller to generate an IN-
TERRUPT when STP has been written to a receive de-
scriptor by the Am79C971 controller.
Flow
The Am79C971 controller polls the current receive de-
scriptor at some point in time before a message arrives.
The Am79C971 controller determines that this receive
buffer is OWNed by the Am79C971 controller and it
stores the descriptor information to be used when a
message does arrive.
N0
Frame preamble appears on the wire, followed
by SFD and destination address.
N1
The 64th byte of frame data arrives from the
wire. This causes the Am79C971 controller to
begin frame data DMA operations to the first
buffer.
C0
When the 64th byte of the message arrives, the
Am79C971 controller performs a lookahead
operation to the next receive descriptor. This
descriptor should be owned by the Am79C971
controller.
C1
The Am79C971 controller intermittently re-
quests the bus to transfer frame data to the first
buffer as it arrives on the wire.
S1
The driver remains idle.
C2
When the Am79C971 controller has completely
filled the first buffer, it writes status to the first
descriptor.
C3
When the first descriptor for the frame has been
written,
changing
ownership
Am79C971 controller to the CPU, the
Am79C971 controller will generate an SRP IN-
TERRUPT. (This interrupt appears as a RINT
interrupt in CSR0).
from
the
S1
The SRP INTERRUPT causes the CPU to
switch tasks to allow the Am79C971 controller
’
s
driver to run.
C4
During the CPU interrupt-generated task
switching, the Am79C971 controller is perform-
ing a lookahead operation to the third descrip-
tor. At this point in time, the third descriptor is
owned by the CPU.
Note:
Even though the third buffer is not owned by the
Am79C971 controller, existing AMD Ethernet control-
lers will continue to perform data DMA into the buffer
space that the controller already owns (i.e., buffer num-
ber 2). The controller does not know if buffer space in
buffer number 2 will be sufficient or not for this frame,
but it has no way to tell except by trying to move the en-
tire message into that space. Only when the message
does not fit will it signal a buffer error condition--there is
no need to panic at this point that it discovers that it
does not yet own descriptor number 3.
S2
The first task of the drivers interrupt service
routing is to collect the header information from
the Am79C971 controller
’
s first buffer and pass
it to the application.
S3
The application will return an application buffer
pointer to the driver. The driver will add an offset
to the application data buffer pointer, since the
Am79C971 controller will be placing the first
portion of the message into the first and second
buffers. (the modified application data buffer
pointer will only be directly used by the
Am79C971 controller when it reaches the third
buffer.) The driver will place the modified data
buffer pointer into the final descriptor of the
group (#3) and will grant ownership of this de-
scriptor to the Am79C971 controller.
C5
Interleaved with S2, S3, and S4 driver activity,
the Am79C971 controller will write frame data
to buffer number 2.
S4
The driver will next proceed to copy the con-
tents of the Am79C971 controller
’
s first buffer
to the beginning of the application space. This
copy will be to the exact (unmodified) buffer
pointer that was passed by the application.
S5
After copying all of the data from the first buffer
into the beginning of the application data buffer,
the driver will begin to poll the ownership bit of
the second descriptor. The driver is waiting for
the Am79C971 controller to finish filling the sec-
ond buffer.
C6
At this point, knowing that it had not previously
owned the third descriptor and knowing that the
current message has not ended (there is more
data in the FIFO), the Am79C971 controller will
make a last ditch lookahead to the final (third)
descriptor. This time the ownership will be
TRUE (i.e., the descriptor belongs tot he con-
troller), because the driver wrote the application
pointer into this descriptor and then changed
the ownership to give the descriptor to the
Am79C971 controller back at S3. Note that if
steps S1, S2, and S3 have not completed at
this time, a BUFF error will result.
C7
After filling the second buffer and performing
the last chance lookahead to the next descrip-
tor, the Am79C971 controller will write the sta-
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| AM79C972BVCW | 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 |
|---|---|
| AM79C972 | 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BKC\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C972BKC\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C972BKCW | 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BKD/W | 制造商:Advanced Micro Devices 功能描述: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。