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Cortina Systems LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers
LXT9785/LXT9785E
Datasheet
249241, Revision 11.0
16 April 2007
7.0 Register Definitions
9
100BASE-T4
0 = 100BASE-T4 capability is not available
1 = 100BASE-T4 capability is available
(The LXT9785/LXT9785E does not support 100BASE-T4 but
allows this bit to be set to advertise in the auto-negotiation
sequence for 100BASE-T4 operation. An external
100BASE-T4 transceiver could be switched in if this
capability is desired.)
R/W
0
8
100BASE-TX
Full-Duplex
0 = Port is not 100BASE-TX full-duplex capable.
1 = Port is 100BASE-TX full-duplex capable
R/W
LSHR2,4
7
100BASE-TX
Half-Duplex
0 =
Port is not 100BASE-TX half-duplex capable
1 = Port is 100BASE-TX half-duplex capable
R/W
LSHR2,4
6
10BASE-T
Full-Duplex
0 = Port is not 10BASE-T full-duplex capable
1 = Port is 10BASE-T full-duplex capable
R/W
LSHR2,4
5
10BASE-T
Half-Duplex
0 = Port is not 10BASE-T half-duplex capable
1 = Port is 10BASE-T half-duplex capable
R/W
LSHR2,4
4:0
Selector
Field,
S<4:0>
<00001> = IEEE 802.3
<00010> = IEEE 802.9 ISLAN-16T
<00000> = Reserved for future auto-negotiation development
<11111> = Reserved for future auto-negotiation development
Unspecified or reserved combinations should not be
transmitted
R/W
00001
Table 89
Auto-Negotiation Link Partner Base Page Ability Register (Address 5)
Bit
Name
Description
Type1
Default2
15
Next Page
0 = Link partner has no ability to send multiple pages
1 = Link partner has ability to send multiple pages
R0
14
Acknowledge
0 = Link partner has not received Link Code Word from the
the LXT9785/LXT9785E
1 = Link partner has received Link Code Word from the
LXT9785/LXT9785E.
R0
13
Remote Fault
0 = No remote fault
1 = Remote fault
R0
12
Reserved
Write as 0, ignore on Read
R
0
11
Asymmetric
Pause
Pause operation defined in Clause 40 and 27
0 = Link partner is not Pause capable
1 = Link partner can only send Pause
R0
1. R = Read Only
2. Default value at the start of auto-negotiation code word transmission.
Table 88
Auto-Negotiation Advertisement Register (Address 4)
Bit
Name
Description
Type1
Default
1. R/W = Read/Write, R = Read Only
2. LSHR = Default value is derived from a single device input pin state or a group of device input pin states as
the pin(s) are latched at startup or hardware reset.
3. The default setting of Register bit 4.10 is determined by the PAUSE pin. The BGA15 package does not
have a Pause hardware configuration pin and has a default of 0.
4. Default settings for bits 4.5:8 are determined by CFG pins as described in Table 42,
Global Hardware
Configuration Settings, on page 126.
5. Pause operation is only valid for full-duplex modes.
6. If Register bit 4.13 is set to advertise a fault, Register bit 1.4 will be set. Register bit 4.13 is set or cleared
only through the MDC/MDIO interface and is not cleared upon completion of auto-negotiation.
Note:
Restart the auto-negotiation process whenever Register 4 is written/modified.