- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄366551 > AM79C978 (Advanced Micro Devices, Inc.) Single-Chip 1/10 Mbps PCI Home Networking Controller PDF資料下載
參數(shù)資料
| 型號(hào)： | AM79C978 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Single-Chip 1/10 Mbps PCI Home Networking Controller |
| 中文描述： | 單芯片的1 / 10 Mbps的家庭網(wǎng)絡(luò)控制器的PCI |
| 文件頁(yè)數(shù)： | 78/261頁(yè) |
| 文件大?。?/td> | 3803K |
| 代理商： | AM79C978 |
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)當(dāng)前第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)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)
78
Am79C978
Table 12.
Access ID Symbol Pulse Positions and
Encoding
The next two AID symbols (5 and 6) encode four bits of
control word information. The MSB is encoded in AID
Symbol 5. Control word messages are described fur-
ther in the
Management Interfaces
section.
AID Transmit Timing
The transmitter encodes the Access ID in a pulse posi-
tion in each 128 TIC interval. Each AID symbol interval
must have only one pulse. Pulse transmission must
start in only one of the four possible positions (mea-
sured from the beginning of the Access ID symbol) de-
fined in Table 12.
AID Receive Timing
The receiver allows for jitter by establishing a window
around each legal pulse position. This window is -2 +1
TICS wide on either side of the position. A pulse that ar-
rives outside of the legal AID positions is considered a
COLLISION event.
Collisions
A Collision is detected only during Access ID and silent
intervals (AID symbols 0 through 7). In general during
a collision, a transmitting station will read back an AID
value that does not match its own and recognizes the
event as a collision and alerts other stations with a JAM
signal. Non-transmitting stations may also detect some
collisions by interpreting received non-conforming AID
pulses as collisions.
With two transmitters colliding, each transmitter nor-
mally blanks its receive input immediately after trans-
mitting (and simultaneously receiving) a pulse.
Therefore, only when a transmitting station receives
pulses in a position earlier than the position it transmit-
ted will it recognize it as a pulse transmitted by another
station and signal a collision.
For this reason, guaranteed collision detection is pos-
sible only as long as the spacing between successive
possible pulse positions in an AID symbol (20 TICs or
2.3
μ
s) is greater than the round trip delay between the
colliding nodes. At approximately 1.5 ns propagation
delay per foot, the maximum distance between two
HomePNA units must not be greater than 500 feet for
collision detection purposes (1.5
μ
s round trip delay
plus margin).
The following criteria must be met to guarantee reliable
collision detection:
At least one HomePNA station of a colliding group
must always detect a collision when the delay between
the beginning of its transmitted packet and the begin-
ning of the received colliding packet is between -1.5
μ
s
and +1.5
μ
s.
In general, any received pulse at a HomePNA station
that does not conform to the pulse position require-
ments of AID symbols 0 through 7 shall indicate a col-
lision on the wire. When a transmitting station senses a
collision, it emits a JAM signal to alert all other stations
to the collision. The following conditions signify a COL-
LISION event:
1. A HomePNA station receives an AID that does not
match the one being sent.
2. A HomePNA station receives a pulse outside the
AID_GUARD INTERVAL in AID intervals 0 to 7.
3. A HomePNA station receives a pulse inside the
SILENT_INTERVAL (AID symbol 7).
As in all cases, pulses received during a blanking inter-
val are ignored.
Passive stations (stations not actively transmitting dur-
ing the collision) cannot reliably detect collisions.
Therefore, once a collision is detected by a transmitting
station, the station must inform the rest of the stations
of the collision with a JAM pattern described below.
Only a transmitting station emits a JAM signal.
Once a collision is detected, the COLLISION signal to
the MAC interface is asserted and is not reset until the
MAC deactivates the TXEN signal.
JAM Signal
A JAM pattern consists of 1 pulse every 32 TICs and
continues until at least the end of the AID intervals.
After the AID interval, the JAM pattern will continue
until TXEN from the MAC is deactivated.
ACCESS ID Values
The access ID values for slave stations are picked by
each individual station randomly from the set of AID
slave numbers described in the management section.
During operation, each HomePNA station monitors
HomePNA frames received on the wire. If it detects an-
other HomePNA station using the same AID, it will se-
lect a new random AID.
Silence Interval (AID symbol 7)
The Access ID symbols are followed by a fixed silence
interval of 129 TICs. The receive blanking interval is
the same as that of the AID symbols (1 through 6).
Any pulses detected in the silence interval are consid-
ered a COLLISION event for transmitting stations and
are handled as described in the
Collisions
section.
Pulse
Position
TICs from Beginning of AID
Symbol
Bit Encoding
1
66
00
2
86
01
3
106
10
4
126
11
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C981 | Integrated Multiport Repeater Plus⑩ (IMR+⑩) |
| AM79C981JC | Integrated Multiport Repeater Plus⑩ (IMR+⑩) |
| AM79C982 | basic Integrated Multiport Repeater (bIMR) |
| AM79C982-4JC | basic Integrated Multiport Repeater (bIMR) |
| AM79C982-8JC | basic Integrated Multiport Repeater (bIMR) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C978A | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Single-Chip 1/10 Mbps PCI Home Networking Controller |
| AM79C978AKC\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C978AKC\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C978AKCW | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Single-Chip 1/10 Mbps PCI Home Networking Controller |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。