EGLXT973QEA3V Cortina Systems Inc, EGLXT973QEA3V Datasheet - Page 55

• Manufacturer Part Number: EGLXT973QEA3V
• Manufacturer: Cortina Systems Inc

Specifications of EGLXT973QEA3V

• Lead Free Status / RoHS Status: Compliant

LXT973 Transceiver
Datasheet
249426, Revision 6.0
13 July 2007
6.0
.
Cortina Systems
OUI tagged
Message
user page 1
user page 2
user page 3
user page 4
1. a is the acknowledge bit; t is the toggle bit; L is the LFSR.
Next Page
Encoding
D15
Auto Negotiation
The LXT973 Transceiver PHY supports the IEEE 802.3u auto-negotiation scheme with
Next Page capability. Next Page exchange utilizes Register 7 to send information and
Register 8 to receive them. Next Page exchange can only occur if both ends of the link
advertise their ability to exchange Next Pages.
The LXT973 Transceiver is configured to make Next Page exchange easier for software.
When a Base Page or Next Page is received, the Page Received Register bit 6.1 remains
set until read. When Register bit 6.2 (Next Page Able) is received, it stays set until read.
This bit is cleared whenever a new negotiation occurs. This prevents the user from
reading an old value in Register 6 and assuming there is valid information in Registers 5
and 8. Additionally, Register 6 contains a new bit (Register bit 6.5) that indicates when the
current Received Page is the Base Page. This information is useful for recognizing when
next pages must be re-sent due to the start of a new negotiation process. Register bit 16.1
and the Page Received bit (Register bit 6.1) are also cleared upon reading Register 6.
®
1
1
1
1
1
LXT973 10/100 Mbps Dual-Port Fast Ethernet PHY Transceiver
D14
a
a
a
a
a
D13
1
0
0
0
0
D12
0
0
0
0
0
D11
t
t
t
t
t
D10
3.10
L.10
2.5
0
0
3.11
2.6
L.9
D9
0
0
3.12
D8
2.7
L.8
L.8
0
3.13
D7
2.8
L.7
L.7
0
3.14
2.9
L.6
L.6
D6
0
3.15
2.10
L.5
L.5
D5
0
2.11
D4
2.0
L.4
L.4
0
2.12
D3
2.1
L.3
L.3
6.0 Auto Negotiation
0
2.13 2.14 2.15
D2
2.2
L.2
L.2
1
2.3
L.1
L.1
D1
0
Page 55
D0
2.4
L.0
L.0
1