LU3X54FTL Datasheet, PDF (35/52 Pages) Agere Systems – QUAD-FET for 10Base-T/100Base-TX/FX

Data Sheet
July 2000
LU3X54FTL
QUAD-FET for 10Base-T/100Base-TX/FX
MII Station Management (continued)
Table 17. MR6—Autonegotiation Expansion Register Bit Descriptions
Register/Bit¹
6.15:5 (RESERVED)
6.4 (PAR_DET_FAULT)
6.3
(LP_NEXT_PAGE_ABLE)
6.2 (NEXT_PAGE_ABLE)
6.1 (PAGE_REC)
6.0 (LP_NWAY_ABLE)
Type²
R
R/LH
R
R
R/LH
R
Description
Reserved.
Parallel Detection Fault. When this bit is set to 1, it indicates that a fault has
been detected in the parallel detection function. This fault is due to more than
one technology detecting concurrent link conditions. This bit can only be
cleared by reading this register.
Link Partner Next Page Able. When this bit is set to 1, it indicates that the
link partner supports the next-page function.
Next Page Able. This bit is set to 1, indicating that this device supports the
next-page function.
Page Received. When this bit is set to 1, it indicates that a NEXT_PAGE has
been received.
Link Partner Autonegotiation Capable. When this bit is set to 1, it indicates
that the link partner is autonegotiation capable.
1. Note that the format for the bit descriptions is as follows: the first number is the register number, the second number is the bit position in the
register, and the name of the instantiated pad is in capital letters.
2. R = read, LH = latched high.
Table 18. MR7—Next-Page Transmit Register Bit Descriptions
Register/Bit¹
7.15 (NEXT_PAGE)
7.14 (ACK)
7.13 (MESSAGE)
7.12 (ACK2)
Type²
R/W
R
R/W
R/W
Description
Next Page. This bit indicates whether or not this is the last NEXT_PAGE to be transmit-
ted. When this bit is 0, it indicates that this is the last NEXT_PAGE. When this bit is 1, it
indicates there is an additional NEXT_PAGE.
Acknowledge. This bit is the acknowledge bit from the link code word.
Message Page. This bit is used to differentiate a message page from an unformatted
page. When this bit is 0, it indicates an unformatted page. When this bit is 1, it indicates
a formatted page.
Acknowledge 2. This bit is used by the next-page function to indicate that a device has
the ability to comply with the message. It is set as follows:
s When this bit is 0, it indicates the device cannot comply with the message.
7.11 (TOGGLE)
s When this bit is 1, it indicates the device will comply with the message.
R Toggle. This bit is used by the arbitration function to ensure synchronization with the link
partner during next-page exchange.
This bit will always take the opposite value of the toggle bit in the previously exchanged
link code word:
s If the bit is a logic 0, the previous value of the transmitted link code word was a logic 1.
s If the bit is a 1, the previous value of the transmitted link code word was a 0.
7.10:0 (MCF)
The initial value of the toggle bit in the first next-page transmitted is the inverse of the
value of bit 11 in the base link code word, and may assume a value of 1 or 0.
R/W Message/Unformatted Code Field. With these 11 bits, there are 2048 possible mes-
sages. Message code field definitions are described in annex 28C of the IEEE 802.3u
standard.
1. Note that the format for the bit descriptions is as follows: the first number is the register number, the second number is the bit position in the
register, and the name of the instantiated pad is in capital letters.
2. R = read, W = write.
Lucent Technologies Inc.
35