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)： 166/265頁(yè)
文件大?。?/td> 3190K
代理商： AM79C971VCW
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166
Am79C971
P R E L I M I N A R Y
EXTREQ should not be set to 1
when the Am79C971 controller is
used in a PCI bus application.
Read accessible always, write
accessible only when either the
STOP or the SPND bit is set. EX-
TREQ is cleared by H_RESET
and is not affected by S_RESET
or STOP.
7
DWIO
Double Word I/O. When set, this
bit indicates that the Am79C971
controller is programmed for
DWord I/O (DWIO) mode. When
cleared, this bit indicates that the
Am79C971 controller is pro-
grammed for Word I/O (WIO)
mode. This bit affects the I/O Re-
source Offset map and it affects
the
defined
Am79C971 controllers I/O re-
sources. See the DWIO and WIO
sections for more details.
width
of
the
The initial value of the DWIO bit is
determined by the programming
of the EEPROM.
The value of DWIO can be al-
tered
automatically
Am79C971 controller. Specifical-
ly, the Am79C971 controller will
set DWIO if it detects a DWord
write access to offset 10h from
the Am79C971 controller I/O
base address (corresponding to
the RDP resource).
by
the
Once the DWIO bit has been set
to a 1, only a H_RESET or an EE-
PROM read can reset it to a 0.
(Note that the EEPROM read op-
eration will only set DWIO to a 0 if
the appropriate bit inside of the
EEPROM is set to 0.)
Read accessible always. DWIO
is read only, write operations
have no effect. DWIO is cleared
by H_RESET and is not affected
S_RESET or by setting the STOP
bit.
6
BREADE
Burst Read Enable. When set,
this bit enables burst mode during
memory read accesses. When
cleared, this bit prevents the de-
vice from performing bursting
during
read
accesses.
Am79C971 controller can per-
form burst transfers when reading
the initialization block, the de-
scriptor
ring
SWSTYLE = 3) and the buffer
memory.
The
entries
(when
BREADE should be set to 1 when
the Am79C971 controller is used
in a PCI bus application to guar-
antee maximum performance.
Read accessible always; write
accessible only when either the
STOP or the SPND bit is set.
BREADE is cleared by H_RESET
and is not affected by S_RESET
or STOP.
5
BWRITE
Burst Write Enable. When set,
this bit enables burst mode during
memory write accesses. When
cleared, this bit prevents the de-
vice from performing bursting
during
write
accesses.
Am79C971 controller can per-
form burst transfers when writing
the descriptor ring entries (when
SWSTYLE = 3) and the buffer
memory.
The
BWRITE should be set to 1 when
the Am79C971 controller is used
in a PCI bus application to guar-
antee maximum performance.
Read accessible always, write
accessible only when either the
STOP or the SPND bit is set.
BWRITE is cleared by H_RESET
and is not affected by S_RESET
or STOP.
4-3
TSTSHDW
Reserved locations. Written an
read as zeros.
2-0
LINBC
Reserved locations. Read acces-
sible always; write accessible
only when either the STOP or the
SPND bit is set. After H_RESET,
the value in these bits will be
001b. The setting of these bits
have no effect on any Am79C971
controller function. LINBC is not
affected by S_RESET or STOP.
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
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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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