Datasheet

78Q2123/78Q2133 Data Sheet DS_21x3_001
4.5 A0 R/W (1) 10BASE-T: If the MR1.11 bit is ‘1’, this bit will be set to ‘1’
upon reset and will be writeable. Otherwise, this bit cannot be
set to ‘1’ by the management.
4.4:0 S4:0 R 01h
Selector Field: Hard coded with the value of ‘00001’ for IEEE
802.3.
Note: Technology Ability Field: MR4.12:5 are the Technology Ability Field bits (A7:0). The default value
of this field is dependent upon the MR1.15:11 register bits. This field can be overwritten by management
to auto-negotiate to an alternate common technology. Writing to this register has no effect until
auto-negotiation is re-initiated.
3.6 MR5: Auto-Negotiation Link Partner Ability Register
Bit Symbol Type Default Description
5.15 NP R 0 Next Page: When ‘1’ is read, it indicates the link partner
wishes to engage in Next Page exchange.
5.14 ACK R 0
Acknowledge: When ‘1’ is read, it indicates the link partner has
successfully received at least 3 consecutive and consistent
FLP bursts.
5.13 RF R 0
Remote Fault: When ‘1’ is read, it indicates the link partner has
a fault.
5.12:5 A7:0 R 0 Technology Ability Field: This field contains the technology
ability of the link partner. The bit definition is the same as
MR4.12:5.
5.4:0 S4:0 R 00h
Selector Field: This field contains the type of message sent by
the link partner. For an IEEE 802.3 compliant link partner, this
field should be ‘00001’.
3.7 MR6:Auto-NegotiationExpansionRegister
Bit Symbol Type Default Description
6.15:5 RSVD R 0 Reserved
6.4 PDF RC 0
Parallel Detection Fault: When ‘1’ is read, it indicates that
more than one technology has been detected during link up.
This bit is cleared when read.
6.3 LPNPA R 0
Link Partner Next Page Able: When ‘1’ is read, it indicates the
link partner supports the Next Page function.
6.2 NPA R 0 Next Page Able: Reads ‘0’ since the 78Q2123/78Q2133 do not
support Next Page function.
6.1 PRX RC 0
Page Received: Reads ‘1’ when a new link code word has
been received into the Auto-Negotiation Link Partner Ability
Register. This bit is cleared upon read.
6.0 LPANEGA R 0 Link Partner Auto-Negotiation Able: When ‘1’ is read, it
indicates the link partner is able to participate in the Auto-
Negotiation function.
3.8 MR16: Vendor Specific Register
Bit Symbol Type Default Description
16.15 RPTR R/W (0) Repeater Mode: When set, the 78Q2123/78Q2133 are put
into Repeater mode of operation. In this mode, full duplex is
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