AM79C976KI AMD (ADVANCED MICRO DEVICES), AM79C976KI Datasheet - Page 207

• Manufacturer Part Number: AM79C976KI
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79C976KI

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 2.97V
• Operating Supply Voltage (max): 3.63V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 208
• Lead Free Status / RoHS Status: Not Compliant

4
3
2
1
0
9/14/00
XMTE
RES
RCVE
SFBDE
COLE
physical, logical filtering, broad-
cast, and promiscuous.
Read/Write accessible. RCVME
is cleared by H_RESET and is
not affected by S_RESET or set-
ting the STOP bit.
this bit is set, a value of 1 is
passed to the LEDOUT bit in this
register when there is transmit
activity on the network.
Read/Write accessible. XMTE is
cleared by H_RESET and is not
affected by S_RESET or setting
the STOP bit.
read as zeros.
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. RCVE is
cleared by H_RESET and is not
affected by S_RESET or setting
the STOP bit.
able. When this bit is set, a value
of 1 is passed to the LEDOUT bit
in this register when the RXD[3:0]
pins are presenting the least sig-
nificant nibble of valid frame data.
Read/Write accessible. RCVE is
cleared by H_RESET and is not
affected by S_RESET or setting
the STOP bit.
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.
Read/Write accessible. COLE is
cleared by H_RESET and is not
affected by S_RESET or setting
the STOP bit.
Transmit Status Enable. When
Reserved location. Written and
Receive Status Enable. When
Start Frame/Byte Delimiter En-
Collision Status Enable. When
P R E L I M I N A R Y
Am79C976
BCR7: LED3 Status
BCR7 controls the function(s) that the LED3 pin dis-
plays. Multiple functions can be simultaneously enabled
on this LED pin. The LED display will indicate the logical
OR of the enabled functions. BCR7 defaults to collision
indication (COLE = 1) 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 this register will be
ignored.
Note: Bits 15-0 in this register are programmable
through the EEPROM.
Bit
31-16 RES
15
14
Name
LEDOUT
LEDPOL
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).
This bit is read only; writes have
no effect. LEDOUT is unaffected
by H_RESET, S_RESET, or
STOP.
When this bit has the value 1, the
LED pin will be driven to a HIGH
level whenever the OR of the en-
abled signals is true. The LED pin
will be driven to a LOW level
whenever the OR of the enabled
signals is false (i.e., the LED out-
put will be a Totem Pole output
and the output value will be the
Reserved locations. Written as
zeros and read as undefined.
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.
LED Polarity. When this bit has
the value 0, the LED pin will be
driven to a LOW level whenever
the OR of the enabled signals is
true. The LED pin will be disabled
and allowed to float high whenev-
er the OR of the enabled signals
is false (i.e., the LED output will
be an Open Drain output and the
output value will be the inverse of
the LEDOUT status bit).
Description
207