參數(shù)資料
型號(hào)： AM79C978AVCW
廠商： ADVANCED MICRO DEVICES INC
元件分類： 微控制器/微處理器
英文描述： Single-Chip 1/10 Mbps PCI Home Networking Controller
中文描述： 5 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
封裝： TQFP-144
文件頁(yè)數(shù)： 114/256頁(yè)
文件大小： 3505K
代理商： AM79C978AVCW
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114
Am79C978A
Note that because several de-
scriptors may be allocated by the
host for each packet, and not all
messages may need all of the de-
scriptors that are allocated be-
tween descriptors that contain
STP = 1, then some descriptors/
buffers may be skipped in the
ring. While performing the search
for the next STP bit that is set to
1, the Am79C978A controller will
advance through the receive de-
scriptor ring regardless of the
state of ownership bits. If any of
the entries that are examined
during
this
search
Am79C978A controller owner-
ship of the descriptor but also in-
dicate
STP = 0,
Am79C978A controller will reset
the OWN bit to 0 in these entries.
If a scanned entry indicates host
ownership with STP = 0, then the
Am79C978A controller will not al-
ter the entry, but will advance to
the next entry.
indicate
then
the
When the STP bit is found to be
true, but the descriptor that con-
tains this setting is not owned by
the Am79C978A controller, then
the Am79C978A controller will
stop advancing through the ring
entries and begin periodic polling
of this entry. When the STP bit is
found to be true, and the descrip-
tor that contains this setting is
owned by the Am79C978A con-
troller, then the controller will stop
advancing through the ring en-
tries, store the descriptor infor-
mation that it has just read, and
wait for the next receive to arrive.
This behavior allows the host
software to pre-assign buffer
space in such a manner that the
header portion of a receive pack-
et will always be written to a par-
ticular memory area, and the data
portion of a receive packet will al-
ways be written to a separate
memory area. The interrupt is
generated when the header bytes
have been written to the header
memory area.
This bit is always read/write ac-
cessible. The LAPPEN bit will be
reset to 0 by H_RESET or
S_RESET and will be unaffected
by STOP.
See Appendix B for more infor-
mation on the Look Ahead Pack-
et Processing concept.
4
DXMT2PD
Disable Transmit Two Part Defer-
ral (see Medium Allocation sec-
tion
in
the
Management
section for more
details). If DXMT2PD is set,
Transmit Two Part Deferral will
be disabled.
Media
Access
This bit is always read/write ac-
cessible. DXMT2PD is cleared by
H_RESET or S_RESET and is
not affected by STOP.
3
EMBA
Enable Modified Back-off Algo-
rithm (see the
Contention Reso-
lution
section in
Media Access
Management
section for more
details). If EMBA is set, a modi-
fied
back-off
implemented.
algorithm
is
This bit is always read/write ac-
cessible. EMBA is cleared by
H_RESET or S_RESET and is
not affected by STOP.
2
BSWP
Byte Swap. This bit is used to
choose between big and little
Endian modes of operation.
When BSWP is set to a 1, big
Endian mode is selected. When
BSWP is set to 0, little Endian
mode is selected.
When big Endian mode is select-
ed, the Am79C978A controller will
swap the order of bytes on the AD
bus during a data phase on ac-
cesses to the FIFOs only. Specifi-
cally, AD[31:24] becomes Byte 0,
AD[23:16] becomes
AD[15:8] becomes Byte 2, and
AD[7:0] becomes Byte 3 when big
Endian mode is selected. When
little Endian mode is selected, the
order of bytes on the AD bus dur-
ing a data phase is: AD[31:24] is
Byte 3, AD[23:16] is Byte 2,
Byte
1,
相關(guān)PDF資料
PDF描述
AM79C978 Single-Chip 1/10 Mbps PCI Home Networking Controller
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)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C978KC/W 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
AM79C978VC/W 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
AM79C979BKC\\W 制造商:Advanced Micro Devices 功能描述:
AM79C98 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Twisted-Pair Ethernet Transceiver (TPEX)
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