參數(shù)資料
型號： AM79C978AVCW
廠商： ADVANCED MICRO DEVICES INC
元件分類： 微控制器/微處理器
英文描述： Single-Chip 1/10 Mbps PCI Home Networking Controller
中文描述： 5 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
封裝： TQFP-144
文件頁數(shù)： 119/256頁
文件大?。?/td> 3505K
代理商： AM79C978AVCW
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Am79C978A
119
ble. As long as the Am79C978A
controller is not reset while in
suspend mode (by H_RESET,
S_RESET, or by setting the
STOP bit), no re-initialization of
the device is required after the
device comes out of suspend
mode. The Am79C978A control-
ler will continue at the transmit
and receive descriptor ring loca-
tions from where it had left, when
it entered the suspend mode.
This bit is always read/write ac-
cessible. SPND is cleared by
H_RESET, S_RESET, or by
setting the STOP bit.
CSR6: RX/TX Descriptor Table Length
Bit
Name
Description
31-16
RES
Reserved locations. Written as
zeros and read as undefined.
15-12
TLEN
Contains a copy of the transmit
encoded ring length (TLEN) field
read from the initialization block
during the Am79C978A control-
ler initialization. This field is writ-
ten during the Am79C978A
initialization routine.
Read accessible only when ei-
ther the STOP or the SPND bit is
set. Write operations have no ef-
fect and should not be per-
formed. TLEN is only defined
after initialization. These bits are
unaffected
by
S_RESET, or STOP.
H_RESET,
11-8
RLEN
Contains a copy of the receive
encoded ring length (RLEN) read
from the initialization block during
Am79C978A controller initializa-
tion. This field is written during
the
Am79C978A
routine.
initialization
Read accessible only when ei-
ther the STOP or the SPND bit is
set. Write operations have no ef-
fect and should not be per-
formed. RLEN is only defined
after initialization. These bits are
unaffected
by
S_RESET, or STOP.
H_RESET,
7-0
RES
Reserved locations. Read as 0s.
Write operations are ignored.
CSR7: Extended Control and Interrupt 2
Certain bits in CSR7 indicate the cause of an interrupt.
The register is designed so that these indicator bits are
cleared by writing ones to those bit locations. This
means that the software can read CSR7 and write back
the value just read to clear the interrupt condition.
Bit
Name
Description
31-16
RES
Reserved locations. Written as
zeros and read as undefined.
15
FASTSPNDE
Fast Suspend Enable. When
FASTSPNDE is set to 1, the
Am79C978A controller performs
a fast suspend whenever the
SPND bit is set.
When a fast suspend is request-
ed, the Am79C978A controller
performs a quick entry into the
suspend mode. At the time the
SPND bit is set, the Am79C978A
controller will complete the DMA
process of any transmit and/or
receive packet that had already
begun DMA activity. In addition,
any transmit packet that had
started transmission will be fully
transmitted, and any receive
packet that had begun reception
will be fully received. However,
no additional packets will be
transmitted or received and no
additional transmit or receive
DMA activity will begin. Hence,
the Am79C978A controller may
enter the suspend mode with
transmit and/or receive packets
still in the FIFOs or the SRAM.
When FASTSPNDE is 0 and the
SPND bit is set, the Am79C978A
controller may take longer before
entering the suspend mode. At
the time the SPND bit is set, the
Am79C978A controller will com-
plete the DMA process of a trans-
mit packet if it had already begun,
and the Am79C978A controller
will completely receive a receive
packet if it had already begun.
Additionally, all transmit packets
stored in the transmit FIFOs and
the transmit buffer area in the
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C978KC/W 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
AM79C978VC/W 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
AM79C979BKC\\W 制造商:Advanced Micro Devices 功能描述:
AM79C98 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Twisted-Pair Ethernet Transceiver (TPEX)
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