3X38FTR Datasheet, PDF (50/64 Pages) Agere Systems – OCTAL-FET (Fast Ethernet Transceiver) for 10Base-T/100Base-TX/FX

3X38FTR 208-Pin SQFP
OCTAL-FET for 10Base-T/100Base-TX/FX
Preliminary Data Sheet
September 2000
Register Information (continued)
Table 28. MR6—Autonegotiation Expansion Register Bit Descriptions
Bit*
Type^†
Description
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)
R
R/LH
R
R
R/LH
R
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 Able. When this bit is set to 1, it indicates
that the link partner is autonegotiation able.
* 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.
† R = read, LH = latched high.
Table 29. MR7—Next Page Transmit Register Bit Descriptions
Bit*
Type^†
Description
7.15 (NEXT_PAGE) R/W 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 page. When this bit is 1, it
indicates there is an additional next page.
7.14 (ACK)
R Acknowledge. This bit is the acknowledge bit from the link code word.
7.13 (MESSAGE)
R/W Message Page. This bit is used to differentiate a message page from an unformat-
ted page. When this bit is 0, it indicates an unformatted page. When this bit is 1, it
indicates a formatted page.
7.12 (ACK2)
R/W 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
messages. Message code field definitions are described in annex 28C of the IEEE
802.3U standard.
* 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.
† R = read, W = write.
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