BCM5208KPF Broadcom, BCM5208KPF Datasheet - Page 43

• Manufacturer Part Number: BCM5208KPF
• Manufacturer: Broadcom

Specifications of BCM5208KPF

• Number Of Receivers: 4
• Data Rate: 10/100Mbps
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 3.14V
• Mounting: Surface Mount
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Lead Free Status / RoHS Status: Not Compliant

n BCM5208
November 3, 1999
ABILITY DETECT. This read-only bit returns a “1” when the Auto-Negotiation state machine is in the Ability Detect state.
It enters this state a specified time period after the Auto-Negotiation process begins, and exits after the first FLP burst or
link pulses are detected from the Link Partner. This bit returns a “0” any time the Auto-Negotiation state machine is not in
the Ability Detect state.
SUPER ISOLATE. Writing a “1” to this bit places the BCM5208 into the Super Isolate mode. Similar to the Isolate mode,
all MII inputs are ignored, and all MII outputs are tri-stated. Additionally, all link pulses are suppressed. This allows the
BCM5208 to coexist with another PHY on the same adapter card, with only one being activated at any time.
10BASE-T SERIAL MODE. Writing a “1” to bit 1 of the Auxiliary Mode Register enables the 10BASE-T Serial mode. In the
normal 10BASE-T mode of operation, as defined by the IEEE MII standard, transmit and receive data packets traverse the
TXD[3:0] and RXD[3:0] busses at a rate of 2.5 MHz. In the special 10BASE-T Serial mode, data packets traverse to the
MAC layer across only TXD[0] and RXD[0] at a rate of 10 MHz. Serial operation is not available in 100BASE-X mode. This
bit is ORed with the SER10 pin.
RXER CODE MODE. Writing a “1” to bit 0 of the Auxiliary Mode Register enables the RXER Code mode during 10BASE-
T operation. In this mode, when a receive data error occurs, indicated by pins RXDV=1 and RXER=1, the RXD[3:0] bus
will contain a non-zero 4-bit encoded value indicating the type of error. This feature provides the user with more detailed
information regarding the status of the system. Writing a “0” to this bit or resetting the chip restores normal operation. Note
that this mode does not disrupt normal communication with the MAC layer, and can safely be used at all times. Also, please
note that the RXER Code mode is not available in 10BASE-T Serial mode. In 100BASE-X operation, the RXER code mode
is always active. See Table 2.
BROADCOM TEST REGISTER
The Broadcom test register bits are reserved and should never be written.
Table 26: Broadcom Test (Address 31d, 1Fh)
BIT
NAME
R/W
DESCRIPTION
DEFAULT
Reserved - Do Not Write
B r o a d c o m C o r p o r a t i o n
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