- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄366549 > AM79C850KCW (ADVANCED MICRO DEVICES INC) SUPERNET-R 3 PDF資料下載
參數(shù)資料
| 型號： | AM79C850KCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SUPERNET-R 3 |
| 中文描述： | 1 CHANNEL(S), 100M bps, FDDI CONTROLLER, PQFP208 |
| 封裝： | PLASTIC, QFP-208 |
| 文件頁數(shù)： | 65/97頁 |
| 文件大小： | 358K |
| 代理商： | AM79C850KCW |
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頁當前第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
P R E L I M I N A R Y
AMD
65
SUPERNET 3
causes the match and exact lines to be asserted. This
pattern will take much longer to apply than the minimal
set presented in table 2.
Destination address exact/inexact logic:
Since the destination address matching logic is identical
to the source address matching logic, the same test can
be applied as described in the previous section of this
document. These tests can be applied simultaneously
with the source address patterns.
PROGRAMMING METHODS
This section provides details of how the AF is intended
to be used. This section provides a description of the
methods to write entries into the AF, to find entries in the
AF and to invalidate entries in the AF.
Writing Entries into the AF
In order for the AF to perform the function of matching
addresses in network frames, the desired addresses
must be loaded into the CAM portion of the AF. The
following procedure should be followed to accomplish
this operation.
1. Write the comparand value into the NP comparand
registers. Note that the comparand register will
retain any previous value if it is not overwritten.
2. Write the NP mask register if it is desired to mask any
portion of the comparand. Note that the mask
register will retain any previous value if it is not
overwritten.
3. Write the NP personality register with the desired
configuration of the SA, SAX, DA and DAX bits. The
VALID bit must be set if this entry is to participate in
any comparisons (either NP or network). If the
VALID bit is not set, this entry may be overwritten
when another entry is written to the CAM. The SKIP
bit should be cleared if this it will be necessary to find
this entry through the NP interface at a later time.
Note that the personality register will retain any
previous value if it is not overwritten.
4. Write the “Write CAM” instruction into the NP
command register.
5. The status register should be read once the DONE
bit is set to ensure that the ERROR bit was not set.
Note:
The ERROR bit in the status register will not be
set if a “Write CAM” instruction is used when this bit is
set. The user has to read this bit status before attempt-
ing to write an entry into the CAM.
Finding Entries in the AF
Once a number of entries are resident in the AF, it may
be necessary to find one or more of them. The process
below should be used to perform this operation.
1. Load the value of the comparand that it is desired to
find into the NP comparand register.
2. Write the “Find” instruction into the NP command
register. Note: the comparand is not modified by the
NP mask registers.
3. Read the NP status register when the DONE bit is
set. If the FOUND bit is set, there is at least one
matching entry in the AF that does not have its SKIP
bit set. If the MULT bit is also set, there is more than
one entry that matches the comparand that does not
have the SKIP bit set.
Invalidating Entries in the AF
In conjunction with managing the contents of the AF, it
may be required to remove entries. This process is
called “invalidation.” To invalidate an entry in the AF, the
following steps should be followed.
1. Load the NP comparand register with the value of the
AF entry that is to be removed.
2. Write the “Find” instruction into the NP command
register.
3. When the DONE bit is set, read the NP status
register. Do one of the following:
3a.If the FOUND bit is not set, there is no entry in the AF
that matches the comparand that does not have its
SKIP bit set.
3b.If the FOUND bit is set and the MULT bit is not set,
there is only one entry in the AF that matches the
comparand that does not have its SKIP bit set. Write
the “Invalidate” instruction into the NP command
register.
3c.If the FOUND and MULT bits are set, there is more
than one entry in the AF that matches the comparand
that does not have its SKIP bit set. If all of these
entries should be invalidated, write the “Invalidate”
instruction followed by the “Find” instruction into the
NP command register repeatedly until the FOUND
bit is not set in the NP status register. If only one of
the multiple matching entries should be invalidated,
write the “Read CAM” instruction to the NP
command register, compare the contents read back
from the CAM to the desired comparand, mask and
personality. If the currently matching AF entry is the
one that should be invalidated, write the “Invalidate”
instruction to the NP command register. If the
currently matching AF entry should not be
invalidated, write the “Skip” instruction to the NP
command register and repeat the invalidate process
from the beginning.
4. Write the “Clear all SKIP” instruction to the NP
command register.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C864AKC | Physical Layer Controller With Scrambler (PLC-S) |
| AM79C864AKCW | Physical Layer Controller With Scrambler (PLC-S) |
| AM79C873 | NetPHY⑩ -1 10/100 Mbps Ethernet Physical Layer Single-Chip Transceiver with 100BASE-FX Support |
| AM79C873KCW | NetPHY⑩ -1 10/100 Mbps Ethernet Physical Layer Single-Chip Transceiver with 100BASE-FX Support |
| AM79C874VI | NetPHY-1LP Low Power 10/100-TX/FX Ethernet Transceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C864A | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Physical Layer Controller With Scrambler (PLC-S) |
| AM79C864AKC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Physical Layer Controller With Scrambler (PLC-S) |
| AM79C864AKCW | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Physical Layer Controller With Scrambler (PLC-S) |
| AM79C864KC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Transceiver |
| AM79C870KC/W | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Transceiver |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。