參數(shù)資料
型號(hào)： AM79C971
廠商： Advanced Micro Devices, Inc.
英文描述： PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus
中文描述： PCnet⑩快速單芯片全雙工10/100 Mbps以太網(wǎng)控制器，PCI總線
文件頁(yè)數(shù)： 160/265頁(yè)
文件大小： 3190K
代理商： AM79C971
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160
Am79C971
P R E L I M I N A R Y
Read/Write accessible always.
RXPOLE is set to 1 by H_RESET
and is not affected by S_RESET
or setting the STOP bit.
2
RCVE
Receive Status Enable. When
this bit is set, a value of 1 is
passed to the LEDOUT bit in this
register when there is receive ac-
tivity on the network.
Read/Write accessible always.
RCVE is set to 1 by H_RESET
and is not affected by S_RESET
or setting the STOP bit.
1
JABE
Jabber Status Enable. When this
bit is set, a value of 1 is passed to
the LEDOUT bit in this register
when the Am79C971 controller is
jabbering on the network.
Read/Write accessible always.
JABE is cleared by H_RESET
and is not affected by S_RESET
or setting the STOP bit.
0
COLE
Collision Status Enable. When
this bit is set, a value of 1 is
passed to the LEDOUT bit in this
register when there is collision
activity on the network. The activ-
ity on the collision inputs to the
AUI port within the first 4
μ
s after
every transmission for the pur-
pose of SQE testing will not
cause the LEDOUT bit to be set.
Read/Write accessible always.
COLE is cleared by H_RESET
and is not affected by S_RESET
or setting the STOP bit.
BCR7: LED3 Status
BCR7 controls the function(s) that the LED3 pin dis-
plays. Multiple functions can be simultaneously en-
abled on this LED pin. The LED display will indicate the
logical OR of the enabled functions. BCR7 defaults to
Transmit Status (XMT) with pulse stretcher enabled
(PSE = 1) and is fully programmable.
Note:
When LEDPE (BCR2, bit 12) is set to 1, pro-
gramming of the LED3 Status register is enabled.
When LEDPE is cleared to 0, programming of the
LED3 register is disabled. Writes to those registers will
be ignored.
Note:
Bits 15-0 in this register are programmable
through the EEPROM.
Bit
Name
Description
31-16 RES
Reserved locations. Written as
zeros and read as undefined.
15
LEDOUT
This bit indicates the current
(non-stretched) value of the LED
output pin. A value of 1 in this bit
indicates that the OR of the en-
abled signals is true.
The logical value of the LEDOUT
status signal is determined by the
settings of the individual Status
Enable bits of the LED register
(bits 8 and 6-0).
Read accessible always. This bit
is read only; writes have no ef-
fect. LEDOUT is unaffected by
H_RESET, S_RESET, or STOP.
14
LEDPOL
LED Polarity. When this bit has
the value 0, then the LED pin will
be driven to a LOW level whenev-
er the OR of the enabled signals
is true, and the LED pin will be
disabled and allowed to float high
whenever the OR of the enabled
signals is false (i.e., the LED out-
put will be an Open Drain output
and the output value will be the
inverse of the LEDOUT status
bit.).
When this bit has the value 1,
then the LED pin will be driven to
a HIGH level whenever the OR of
the enabled signals is true, and
the LED pin will be driven to a
LOW level whenever the OR of
the enabled signals is false (i.e.,
the LED output will be a Totem
Pole output and the output value
will be the same polarity as the
LEDOUT status bit).
The setting of this bit will not ef-
fect the polarity of the LEDOUT
bit for this register.
Read/Write accessible always.
LEDPOL is cleared by H_RESET
and is not affected by S_RESET
or setting the STOP bit.
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參數(shù)描述
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AM79C971AWW WAF 制造商:Advanced Micro Devices 功能描述:
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