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參數資料
| 型號： | AM79C971 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
| 中文描述： | PCnet⑩快速單芯片全雙工10/100 Mbps以太網控制器，PCI總線 |
| 文件頁數： | 185/265頁 |
| 文件大?。?/td> | 3190K |
| 代理商： | AM79C971 |
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Am79C971
185
P R E L I M I N A R Y
to a match of the frame
’
s destina-
tion address with the content of
the physical address register.
PAM is valid only when ENP is
set. PAM is set by the Am79C971
controller and cleared by the
host.
This bit does not exist when the
Am79C971 controller is pro-
grammed to use 16-bit software
structures for the descriptor ring
entries (BCR20, bits 7-0, SW-
STYLE is cleared to 0).
21
LAFM
Logical Address Filter Match is
set by the Am79C971 controller
when it accepts the received
frame based on the value in the
logical address filter register.
LAFM is valid only when ENP is
set.
LAFM
is
Am79C971
controller
cleared by the host.
set
by
the
and
Note that if DRCVBC (CSR15, bit
14) is cleared to 0, only BAM, but
not LAFM will be set when a
Broadcast frame is received,
even if the Logical Address Filter
is programmed in such a way that
a Broadcast frame would pass
the hash filter. If DRCVBC is set
to 1 and the Logical Address Fil-
ter is programmed in such a way
that a Broadcast frame would
pass the hash filter, LAFM will be
set on the reception of a Broad-
cast frame.
This bit does not exist when the
Am79C971 controller is pro-
grammed to use 16-bit software
structures for the descriptor ring
entries (BCR20, bits 7-0, SW-
STYLE is cleared to 0).
20
BAM
Broadcast Address Match is set
by the Am79C971 controller
when it accepts the received
frame, because the frame
’
s desti-
nation address is of the type
’
Broadcast.
’
BAM is valid only
when ENP is set. BAM is set by
the Am79C971 controller and
cleared by the host.
This bit does not exist when the
Am79C971 controller is pro-
grammed to use 16-bit software
structures for the descriptor ring
entries (BCR20, bits 7-0, SW-
STYLE is cleared to 0).
19-16 RES
Reserved locations. These loca-
tions should be read and written
as zeros.
15-12 ONES
These four bits must be written as
ones. They are written by the host
and
unchanged
Am79C971 controller.
by
the
11-00 BCNT
Buffer Byte Count is the length of
the buffer pointed to by this de-
scriptor, expressed as the two
’
s
complement of the length of the
buffer. This field is written by the
host and unchanged by the
Am79C971 controller.
RMD2
Bit
Name
Description
ZERO
This field is reserved. The
Am79C971 controller will write a
zero to this location.
30-16 RFRTAG
Receive Frame Tag. Indicates
the Receive Frame Tag applied
from the EADI interface. This field
is user defined and has a default
value of all zeros. When RX-
FRTG (CSR7, bit 14) is set to 0,
RFRTAG will be read as all zeros.
See the section on
Receive
Frame Tagging
for details.
15-12 ZEROS
This field is reserved. Am79C971
controller will write zeros to these
locations.
11-0
MCNT
Message Byte Count is the length
in bytes of the received message,
expressed as an unsigned binary
integer. MCNT is valid only when
ERR is clear and ENP is set.
MCNT
is
written
Am79C971
controller
cleared by the host.
by
the
and
Note
: This is a 13-bit internal
counter.
相關PDF資料 |
PDF描述 |
|---|---|
| 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 |
| AM79C972 | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AM79C971AKC | 制造商:Advanced Micro Devices 功能描述: |
| AM79C971AVC | 制造商:Advanced Micro Devices 功能描述:10/100 MBPS ETHERNET - Trays |
| AM79C971AVC\\W | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AM79C971AVC\W | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AM79C971AWW WAF | 制造商:Advanced Micro Devices 功能描述: |
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