AM79C976KI AMD (ADVANCED MICRO DEVICES), AM79C976KI Datasheet - Page 161

• 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

LED1 Control Register
Offset 0E2h
This register controls the function(s) that the LED1 pin
displays. Multiple functions can be simultaneously en-
abled on this LED pin. The LED display will indicate the
logical OR of the enabled functions. This register de-
faults to transmit or receive activity (XMTE = 1 and
RCVE = 1) with pulse stretcher enabled (PSE = 1) and
is fully programmable.
All bits in this register are restored to their default val-
ues when the RST pin is asserted, before the serial
EEPROM is read, and after a serial EEPROM read er-
ror.
This register is an alias of BCR5.
The functions of the bits in this register are identical to
those of the LED0 Control Register, except that for this
register the default value for the XMTE, RCVE, and
PSE bits is 1, and the default value for all other bits is 0.
LED2 Control Register
Offset 0E4h
This register controls the function(s) that the LED2 pin
displays. Multiple functions can be simultaneously en-
abled on this LED pin. The LED display will indicate the
logical OR of the enabled functions. This register de-
faults to 100 Mb/s speed indication (100E = 1) with
pulse stretcher enabled (PSE = 1) and is fully program-
mable.
9/14/00
Bit
5
4
3
2
1
0
RCVME
SFBDE
XMTE
RCVE
Name
COLE
RES
Receive Match Status Enable. When this bit is set, a value of 1 is passed to the LEDOUT bit in this
register when there is receive activity on the network that has passed the address match function
for this node. All address matching modes are included: physical, logical filtering, broadcast and
promiscuous.
The default value of this bit is 0.
Transmit Status Enable. When 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.
The default value of this bit is 0.
Reserved location. Written and read as undefined.
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 activity on the network.
The default value of this bit is 0.
Start Frame/Byte Delimiter Enable. 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 significant nibble of valid frame
data.
The default value of this bit is 0.
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 default value of this bit is 0.
P R E L I M I N A R Y
Am79C976
All bits in this register are restored to their default val-
ues when the RST pin is asserted, before the serial
EEPROM is read, and after a serial EEPROM read
error.
This register is an alias of BCR6.
The functions of the bits in this register are identical to
those of the LED0 Control Register, except that for this
register the default value for the 100E and PSE bits is
1, and the default value for all other bits is 0.
LED3 Control Register
Offset 0E6h
This register controls the function(s) that the LED3 pin
displays. Multiple functions can be simultaneously en-
abled on this LED pin. The LED display will indicate the
logical OR of the enabled functions. This register de-
faults to collision indication (COLE = 1) with pulse
stretcher enabled (PSE = 1) and is fully programmable.
All bits in this register are restored to their default val-
ues when the RST pin is asserted, before the serial
EEPROM is read, and after a serial EEPROM read er-
ror.
This register is an alias of BCR7.
The functions of the bits in this register are identical to
those of the LED0 Control Register, except that for this
register the default value for the COLE and PSE bits is
1, and the default value for all other bits is 0.
Description
161