參數(shù)資料
型號(hào)： Am79C965A
廠商： Advanced Micro Devices, Inc.
英文描述： PCnet?-32 Single-Chip 32-Bit Ethernet Controller
中文描述： PCnet？-32單芯片32位以太網(wǎng)控制器
文件頁(yè)數(shù)： 159/228頁(yè)
文件大?。?/td> 1681K
代理商： AM79C965A
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Am79C965A
159
floated. When LEDDIS has the
value ZERO, then the LED output
value will be governed by the
LEDOUT and LEDPOL values.
12-8
RES
Reserved
ZEROs, read as undefined.
locations.
Write
as
7
PSE
Pulse Stretcher Enable. Extends the
LED illumination time for each new
occurrence of the enabled function
for this LED output.
A value of 0 disables the function. A
value of 1 enables the function.
6
LNKSTE
Link Status Enable. Indicates the
current link status on the Twisted
Pair interface. When this bit is set, a
value of ONE will be passed to the
LEDOUT signal to indicate that the
link status state is PASS. A value of
ZERO will be passed to the
LEDOUT signal to indicate that the
link status state is FAIL.
A value of 0 disables the signal. A
value of 1 enables the signal.
5
RCVME
Receive
Indicates receive activity on the
network that has passed the ad-
dress match function for this node.
All address matching modes are
included: Physical, Logical filtering,
Promiscuous, Broadcast, and EADI.
Match
status
Enable.
A value of 0 disables the signal. A
value of 1 enables the signal.
4
XMTE
Transmit status Enable. Indicates
PCnet-32 controller transmit activity.
A value of 0 disables the signal. A
value of 1 enables the signal.
3
RXPOLE Receive Polarity status Enable.
Indicates the current Receive
Polarity condition on the Twisted
Pair interface. A value of ONE
indicates that the polarity of the
RXD± pair has been reversed. A
value of ZERO indicates that the
polarity of the RXD± pair has not
been reversed.
Receive polarity indication is valid
only if the LNKST bit of BCR4
indicates link PASS status.
A value of 0 disables the signal. A
value of 1 enables the signal.
2
RCVE
Receive status Enable. Indicates
receive activity on the network.
A value of 0 disables the signal. A
value of 1 enables the signal.
1
JABE
Jabber status Enable. Indicates that
the PCnet-32 controller is jabbering
on the network.
A value of 0 disables the signal. A
value of 1 enables the signal.
0
COLE
Collision status Enable. Indicates
collision activity on the network.
When the AUI port is selected,
collision activity during the 4.0 ms
internal following a transmit
completion (SQE internal) will not
activate the LEDOUT bit.
A value of 0 disables the signal. A
value of 1 enables the signal.
BCR16: I/O Base Address Lower
Bit
Name
Description
Note that all bits in this register are
programmable through the
EEPROM PREAD operation and
through the Software Relocatable
Mode operation.
31-16 RES
Reserved locations. Written as
zeros and read as undefined.
15-5
IOBASEL I/O Base Address Lower 16 bits.
These bits are used to determine
the location of the PCnet-32
controller in all of I/O space. They
function as bits 15 through 5 of the I/
O address of the PCnet-32
controller. Note that the lowest five
bits of the PCnet-32 controller I/O
space are not programmable. These
bits are assumed to be ZEROs. This
means that it is not possible to
locate the PCnet-32 controller on a
space that does not begin on a 32-
byte block boundary. The value of
IOBASEL is determined in either of
two ways:
1.The ISOBASEL value may be set
during the EEPROM read.
2.If no EEPROM exists, or if there
is an error detected in the
EEPROM data, then the PCnet-32
controller will enter Software Relo-
catable Mode, and a specific
sequence of write accesses to I/O
address 378h will cause the
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參數(shù)描述
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