參數(shù)資料
型號(hào)： AM79C971VCW
廠商： ADVANCED MICRO DEVICES INC
元件分類： 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)： 120/265頁(yè)
文件大小： 3190K
代理商： AM79C971VCW
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120
Am79C971
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 Am79C971 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
Am79C971 controller ownership
of the descriptor but also indicate
STP = 0, then the Am79C971
controller will reset the OWN bit
to 0 in these entries. If a scanned
entry indicates host ownership
with
STP = 0,
Am79C971 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 Am79C971 controller, then
the Am79C971 controller will stop
advancing through the ring en-
tries 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 Am79C971 control-
ler, then the Am79C971 control-
ler will stop advancing through
the ring entries, store the descrip-
tor information that it has just
read, and wait for the next re-
ceive 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.
Read/Write accessible always.
The LAPPEN bit will be reset to 0
by H_RESET or S_RESET and
will be unaffected by STOP.
See Appendix D 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
Read/Write accessible always.
DXMT2PD
is
H_RESET or S_RESET and is
not affected by STOP.
cleared
by
3
EMBA
Enable Modified Back-off Algo-
rithm (see Contention Resolution
section in
Media Access Man-
agement
section for more de-
tails). If EMBA is set, a modified
back-off algorithm is implement-
ed.
Read/Write accessible always.
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 En-
dian 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 se-
lected.
When big Endian mode is select-
ed, the Am79C971 controller will
swap the order of bytes on the AD
bus during a data phase on ac-
cesses to the FIFOs only. Specif-
ically, AD[31:24] becomes Byte
0, AD[23:16] becomes Byte 1,
AD[15:8] becomes Byte 2, and
AD[7:0] becomes Byte 3 when
big Endian mode is selected.
When little Endian mode is se-
lected, the order of bytes on the
AD bus during a data phase is:
AD[31:24] is Byte 3, AD[23:16] is
Byte 2, AD[15:8] is Byte 1, and
AD[7:0] is Byte 0.
Byte swap only affects data
transfers that involve the FIFOs.
Initialization block transfers are
not affected by the setting of the
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: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: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:
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