AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 201

• Manufacturer Part Number: AM79C976
• Description: PCnet-PRO 10/100 Mbps PCI Ethernet Controller
• Manufacturer: Advanced Micro Devices

7
6
5
4
3
2
8/01/00
PSE
LNKSE
RCVME
XMTE
RES
RCVE
Read/Write accessible. FDLSE is
cleared by H_RESET and is not
affected by S_RESET or setting
the STOP bit.
this bit is set, the LED illumination
time is extended for each new oc-
currence of the enabled function
for this LED output. A value of 0
disables the pulse stretcher.
Read/Write accessible. PSE is
set to 1 by H_RESET and is not
affected by S_RESET or setting
the STOP bit.
is set, a value of 1 will be passed
to the LEDOUT bit in this register
when in Link Pass state.
Read/Write accessible. LNKSE is
set to 1 by H_RESET and is not
affected by S_RESET or setting
the STOP bit.
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 that has
passed the address match func-
tion for this node. All address
matching modes are included:
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
Pulse Stretcher Enable. When
Link Status Enable. When this bit
Receive Match Status Enable.
Transmit Status Enable. When
Reserved location. Written and
Receive Status Enable. When
P R E L I M I N A R Y
Am79C976
1
0
BCR5 controls the function(s) that the LED1 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. BCR5 defaults to
transmit or receive activity (XMTE = 1 and RCVE = 1)
with pulse stretcher enabled (PSE = 1) and is fully pro-
grammable.
Note: When LEDPE (BCR2, bit 12) is set to 1, pro-
gramming of the LED1 Status register is enabled.
When LEDPE is cleared to 0, programming of the
LED1 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
SFBDE
COLE
Name
LEDOUT
Read/Write accessible. RCVE is
cleared by H_RESET and is not
affected by S_RESET or setting
the STOP bit.
Read/Write accessible. RCVE is
cleared by H_RESET and is not
affected by S_RESET or setting
the STOP bit.
Read/Write accessible. COLE is
cleared by H_RESET and is not
affected by S_RESET or setting
the STOP bit.
passed to the LEDOUT bit in this
register when there is receive ac-
tivity on the network.
Start Frame/Byte Delimiter En-
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.
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.
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.
Collision Status Enable. When
Description
Reserved locations. Written as
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