參數(shù)資料
型號(hào)： AM79C970
廠商： Advanced Micro Devices, Inc.
英文描述： PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
中文描述： PCnetTM - PCI單芯片以太網(wǎng)控制器的PCI總線
文件頁(yè)數(shù)： 104/168頁(yè)
文件大?。?/td> 943K
代理商： AM79C970
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P R E L I M I N A R Y
AMD
1-971
Am79C970
13–12 RCVFW[1:0] Receive
FIFO
Watermark.
RCVFW controls the point at
which receive DMA is requested
in relation to the number of re-
ceived bytes in the receive FIFO.
RCVFW specifies the number of
bytes which must be present
(once the frame has been veri-
fied as a non-runt) before receive
DMA is requested. Note however
that in order for receive DMA to
be performed for a new frame, at
least 64 bytes must have been
received. This effectively avoids
having to react to receive frames
which are runts or suffer a colli-
sion during the slot time (512 bit
times). If the Runt Packet Accept
feature is enabled, receive DMA
will be requested as soon as
either the RCVFW threshold is
reached, or a complete valid re-
ceive frame is detected (regard-
less of length). RCVFW is set to
a value of 10b (64 bytes) after
H_RESET or S_RESET and is
unaffected by STOP.
RCVFW[1:0]
00
01
10
11
Bytes Received
16
32
64
Reserved
Read/write accessible only when
STOP bit is set.
Certain combinations of water-
mark programming and LINBC
(BCR18, bits 2–0) programming
may create situations where no
linear bursting is possible, or
where the FIFO may be exces-
sively read or excessively writ-
ten. Such combinations are
declared as illegal.
Combinations of watermark set-
tings and LINBC (BCR 18, bits
2–0) settings must obey the fol-
lowing relationship:
watermark (in bytes)
≥
LINBC (in bytes)
Combinations of watermark and
LINBC settings that violate this
rule may cause unexpected
behavior.
Transmit Start Point. XMTSP
controls the point at which pre-
amble transmission attempts
commence in relation to the num-
ber of bytes written to the
11–10 XMTSP[1:0]
transmit FIFO for the current
transmit frame. When the entire
frame is in the FIFO, transmis-
sion will start regardless of the
value in XMTSP. XMTSP is
given a value of 10b (64 bytes)
after H_RESET or
S_RESET and is unaffected by
STOP. Regardless of XMTSP,
the FIFO will not internally over
write its data until at least 64
bytes (or the entire frame if < 64
bytes) have been transmitted
onto the network. This ensures
that for collisions within the slot
time window, transmit data need
not be re-written to the transmit
FIFO, and re-tries will be handled
autonomously by the MAC. This
bit is read/write accessible only
when the STOP bit is set.
XMTSP[1:0]
00
01
10
11
Bytes Written
4
16
64
112
9–8 XMTFW[1:0]
Transmit
XMTFW specifies the point at
which transmit DMA stops,
based upon the number of write
cycles that could be performed to
the transmit FIFO without FIFO
overflow. Transmit DMA is al-
lowed at any time when the num-
ber of write cycles specified by
XMTFW could be executed with-
out causing transmit FIFO over-
flow. XMTFW is set to a value of
00b (8 cycles) after H_RESET or
S_RESET and is unaffected by
STOP. Read/write accessible
only when STOP bit is set.
FIFO
Watermark.
XMTFW[1:0]
00
01
10
11
Bytes Written
16
32
64
Reserved
Certain combinations of water-
mark programming and LINBC
(BCR18, bits 2–0) programming
may create situations where no
linear bursting is possible, or
where the FIFO may be exces-
sively read or excessively writ-
ten. Such combinations are
declared as illegal.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C970A 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970AKC 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970AKC\\W 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Advanced Micro Devices 功能描述:
AM79C970AKC\W 制造商:Rochester Electronics LLC 功能描述:- Bulk
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