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參數(shù)資料
| 型號(hào)： | AM79C978 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Single-Chip 1/10 Mbps PCI Home Networking Controller |
| 中文描述： | 單芯片的1 / 10 Mbps的家庭網(wǎng)絡(luò)控制器的PCI |
| 文件頁(yè)數(shù)： | 138/261頁(yè) |
| 文件大小： | 3803K |
| 代理商： | AM79C978 |
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138
Am79C978
CSR78: Transmit Ring Length
Bit
Name
Description
31-16 RES
Reserved locations. Written as
zeros and read as undefined.
15-0
XMTRL
Transmit Ring Length. Contains
the two
’
s complement of the
transmit descriptor ring length.
This register is initialized during
the Am79C978 controller
’
s initial-
ization routine based on the value
in the TLEN field of the initializa-
tion block. However, this register
can be manually altered. The ac-
tual transmit ring length is defined
by the current value in this regis-
ter. The ring length can be de-
fined as any value from 1 to
65535.
These bits are read/write acces-
sible only when either the STOP
or the SPND bit is set. These bits
are unaffected by H_RESET,
S_RESET, or STOP.
CSR80: DMA Transfer Counter and FIFO Threshold
Control
Bit
Name
Description
31-16 RES
Reserved locations. Written as
zeros and read as undefined.
15-14 RES
Reserved locations. Written as
zeros and read as undefined.
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 verified
as a non-runt) before receive
DMA is requested. Note, howev-
er, that if the network interface is
operating in half-duplex mode, in
order for receive DMA to be per-
formed for a new frame at least
64 bytes must have been re-
ceived. 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 or if the net-
work interface is operating in full-
duplex mode, receive DMA will
be requested as soon as either
the RCVFW threshold is reached
or a complete valid receive frame
is detected (regardless of length).
When the FDRPAD (BCR9, bit 2)
is set and the Am79C978 control-
ler is in full-duplex mode, in order
for receive DMA to be performed
for a new frame at least 64 bytes
must have been received. This
effectively disables the runt pack-
et accept feature in full duplex.
When operating in the NO-SRAM
mode (no SRAM enabled), the
Bus Receive FIFO and the MAC
Receive operate like a single
FIFO and the watermark value
selected by RCVFW[1:0] sets the
number of bytes that must be
present in the FIFO before re-
ceive DMA is requested.
When operating with the SRAM,
the Bus Receive FIFO, and the
MAC Receive FIFO operate inde-
pendently on the bus side and
MAC side of the SRAM, respec-
tively. In this case, the watermark
value set by RCVFW[1:0] sets the
number of bytes that must be
present in the Bus Receive FIFO
only. See Table 32.
Table 32.
Receive Watermark Programming
These bits are read/write acces-
sible only when either the STOP
or
the
SPND
RCVFW[1:0] is set to a value of
01b (64 bytes) after H_RESET or
S_RESET and is unaffected by
STOP.
bit
is
set.
11-10 XMTSP[1:0] Transmit Start Point. XMTSP
controls the point at which pream-
ble transmission attempts to com-
mence in relation to the number
of bytes written to the MAC
Transmit FIFO for the current
RCVFW[1:0]
00
01
10
11
Bytes Received
16
64
112
Reserved
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C981 | Integrated Multiport Repeater Plus⑩ (IMR+⑩) |
| AM79C981JC | Integrated Multiport Repeater Plus⑩ (IMR+⑩) |
| AM79C982 | basic Integrated Multiport Repeater (bIMR) |
| AM79C982-4JC | basic Integrated Multiport Repeater (bIMR) |
| AM79C982-8JC | basic Integrated Multiport Repeater (bIMR) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C978A | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Single-Chip 1/10 Mbps PCI Home Networking Controller |
| AM79C978AKC\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C978AKC\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C978AKCW | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Single-Chip 1/10 Mbps PCI Home Networking Controller |
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