BCM5208KPF Broadcom, BCM5208KPF Datasheet - Page 40

• 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
10BASE-T AUXILIARY ERROR & GENERAL STATUS REGISTER
The bit descriptions for the 10BASE-T auxiliary error and general status register are shown in Table 23.
All Error bits in the Auxiliary Error Status Register are read-only and are latched high. When certain types of errors occur
in the BCM5208, one or more corresponding error bits become “1”. They remain so until the register is read, or until a chip
reset occurs. All such errors necessarily result in data errors, and are indicated by a high value on the RXER output pin at
the time the error occurs.
MANCHESTER CODE ERROR. Indicates that a Manchester code violation was received. This bit is only valid during
10BASE-T operation.
EOF ERROR. Indicates that the EOF (end of frame) sequence was improperly received, or not received at all. This error
bit is only valid during 10BASE-T operation.
POLARITY. Reflects the Polarity status of the receive channel pair. The BCM5208 is capable of automatically inverting the
polarity of the receive channel. No data errors are reported to indicate that the automatic polarity inversion is occurring.
Instead, this bit returns a “1” whenever the polarity of the receive channel is inverted.
REVISION. Read-only bits that return the revision number of the BCM5208. The current revision is labelled “001”.
REPEATER MODE INDICATION. Returns the same value as the RPTR input pin. When the BCM5208 is in DTE mode, it
returns a “0”. When the BCM5208 is in Repeater mode, it returns a “1”.
AUTO-NEGOTIATION INDICATION. A read-only bit that indicates whether Auto-Negotiation has been enabled or disabled
on the BCM5208. A combination of a “1” in bit 12 of the Control Register and a logic “1” on the ANEN input pin is required
to enable Auto-Negotiation. When Auto-Negotiation is disabled, bit 15 of the Auxiliary Mode Register returns a “0”. At all
other times, it returns a “1”.
FORCE100/10 INDICATION. A read-only bit that returns a value of “0” when one of following two cases is true:
1. The ANEN pin is low AND the F100 pin is low.
2. Bit 12 of the Control Register has been written “0” AND bit 13 of the Control Register has been written “0”.
When bit 8 of the Auxiliary Control Register is “0”, the speed of the chip will be 10BASE-T. In all other cases, either the
speed is not forced (Auto-Negotiation is enabled), or the speed is forced to 100BASE-X.
Page 32
BIT
15:11
10
9
8
7:5
4
3
2
1
0
NAME
Reserved
Manchester Code Error
EOF Error
Polarity Inversion
Revision
Repeater Mode Indication
Auto-Negotiation Indication
Force 100/10 Indication
Speed Indication
Full-Duplex Indication
Table 23: 10BASE-T Auxiliary Error and General Status Register (Address 28d, 1Ch)
R/W
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
B r o a d c o m C o r p o r a t i o n
DESCRIPTION
Ignore when read
1 = Manchester code error (10BASE-T)
1 = EOF detection error (10BASE-T)
1 = Channel Polarity Inverted
0 = Channel Polarity Correct
Revision Number
1 = Repeater mode
0 = DTE mode
1 = Auto-Negotiation activated
0 = Speed forced manually
1 = Speed forced to 100BASE-X
0 = Speed forced to 10BASE-T
1 = 100BASE-X
0 = 10BASE-T
1 = Full-duplex active
0 = Full-duplex not active
Document 5208-DS03-R¥¥¥¥¥
November 3, 1999
DEFAULT
x
0
0
0
001
0
1
1
0
0