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參數(shù)資料
| 型號(hào)： | AM79C971KCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | IC LOGIC 16211 24-BIT FET BUS SWITCH -40+85C TSSOP-56 35/TUBE |
| 中文描述： | 4 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP16 |
| 封裝： | PLASTIC, QFP-160 |
| 文件頁(yè)數(shù)： | 165/265頁(yè) |
| 文件大?。?/td> | 3190K |
| 代理商： | AM79C971KCW |
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Am79C971
165
P R E L I M I N A R Y
For an adapter card application,
the value used for clock period
should be 30 ns to guarantee cor-
rect interface timing at the maxi-
mum clock frequency of 33 MHz.
Read accessible always; write
accessible only when the STOP
bit is set. ROMTMG is set to the
value of 1001b by H_RESET and
is not affected by S_RESET or
STOP. The default value allows
using an Expansion ROM with an
access time of 250 ns in a system
with a maximum clock frequency
of 33 MHz.
11
NOUFLO
No Underflow on Transmit. When
the NOUFLO bit is set to 1, the
Am79C971 controller will not start
transmitting the preamble for a
packet until the Transmit Start
Point (CSR80, bits 10-11) re-
quirement (except when XMTSP
= 3h, Full Packet has no meaning
when NOUFLO is set to 1) has
been met
and
the complete pack-
et has been DMA
’
d into the
Am79C971 controller. The com-
plete packet may reside in any
combination of the Bus Transmit
FIFO, the external SRAM, and
the MAC Transmit FIFO, as long
as enough of the packet is in the
MAC Transmit FIFO to meet the
Transmit Start Point requirement.
When the NOUFLO bit is cleared
to 0, the Transmit Start Point is
the only restriction on when pre-
amble transmission begins for
transmit packets.
Setting the NOUFLO bit guaran-
tees that the Am79C971 control-
ler will never suffer transmit
underflows, because the arbiter
that controls transfers to and from
the external SRAM guarantees a
worst case latency on transfers to
and from the MAC and Bus
Transmit FIFOs such that it will
never underflow if the complete
packet has been DMA
’
d into the
Am79C971
controller
packet transmission begins.
before
The NOUFLO bit should not be
set when the Am79C971 control-
ler is operating in the NO-SRAM
mode with no external SRAM.
Read/Write accessible only when
either the STOP or the SPND bit
is set. NOUFLO is cleared to 0 af-
ter H_RESET or S_RESET and
is unaffected by STOP.
10
RES
Reserved location. Written as ze-
ros and read as undefined.
9
MEMCMD
Memory Command used for burst
read accesses to the transmit
buffer. When MEMCMD is set to
0, all burst read accesses to the
transmit buffer are of the PCI
command type Memory Read
Line (type 14). When MEMCMD
is set to 1, all burst read accesses
to the transmit buffer are of the
PCI command type Memory
Read Multiple (type 12).
Read accessible always; write
accessible only when either the
STOP or the SPND bit is set.
MEMCMD
is
H_RESET and is not affected by
S_RESET or STOP.
cleared
by
8
EXTREQ
Extended Request. This bit con-
trols the deassertion of REQ for a
burst transaction. If EXTREQ is
set to 0, REQ is deasserted at the
beginning of a burst transaction.
(The Am79C971 controller never
performs more than one burst
transaction within a single bus
mastership period.) In this mode,
the Am79C971 controller relies
on the PCI latency timer to get
enough bus bandwidth, in case
the system arbiter also removes
GNT at the beginning of the burst
transaction. If EXTREQ is set to
1, REQ stays asserted until the
last but one data phase of the
burst transaction is done. This
mode is useful for systems that
implement an arbitration scheme
without preemption and require
that REQ stays asserted through-
out the transaction.
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PDF描述 |
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| 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 |
| AM79C972BVIW | 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 |
|---|---|
| AM79C971VCW | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
| 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 |
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