LAN9303i SMSC [SMSC Corporation], LAN9303i Datasheet - Page 92
LAN9303i
Manufacturer Part Number
LAN9303i
Description
Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
Manufacturer
SMSC [SMSC Corporation]
Datasheet
1.LAN9303I.pdf
(366 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LAN9303i-ABZJ
Manufacturer:
Standard
Quantity:
1 955
Company:
Part Number:
LAN9303i-ABZJ
Manufacturer:
SMSC10
Quantity:
510
Part Number:
LAN9303i-ABZJ
Manufacturer:
SMSC
Quantity:
20 000
- Current page: 92 of 366
- Download datasheet (5Mb)
Revision 1.3 (08-27-09)
7.2.1.3
7.2.1.4
7.2.1.5
7.2.1.6
GROUP
CODE
00010
00011
00101
01000
01100
10000
Scrambler and PISO
Repeated data patterns (especially the IDLE code-group) can have power spectral densities with large
narrow-band peaks. Scrambling the data helps eliminate these peaks and spread the signal power
more uniformly over the entire channel bandwidth. This uniform spectral density is required by FCC
regulations to prevent excessive EMI from being radiated by the physical wiring. The scrambler also
performs the Parallel In Serial Out conversion (PISO) of the data.
The seed for the scrambler is generated from the PHY address, ensuring that each PHY will have its
own scrambler sequence. For more information on PHY addressing, refer to
Addressing".
NRZI and MLT-3 Encoding
The scrambler block passes the 5-bit wide parallel data to the NRZI converter where it becomes a
serial 125MHz NRZI data stream. The NRZI is then encoded to MLT-3. MLT-3 is a tri-level code where
a change in the logic level represents a code bit “1” and the logic output remaining at the same level
represents a code bit “0”.
100M Transmit Driver
The MLT-3 data is then passed to the analog transmitter, which drives the differential MLT-3 signal on
output pins TXPx and TXNx (where “x” is replaced with “1” for the Port 1 PHY, or “2” for the Port 2
PHY), to the twisted pair media across a 1:1 ratio isolation transformer. The 10BASE-T and 100BASE-
TX signals pass through the same transformer so that common “magnetics” can be used for both. The
transmitter drives into the 100 Ω impedance of the CAT-5 cable. Cable termination and impedance
matching require external components.
100M Phase Lock Loop (PLL)
The 100M PLL locks onto the reference clock and generates the 125MHz clock used to drive the 125
MHz logic and the 100BASE-TX Transmitter.
SYM
/V/
/V/
/V/
/V/
/V/
/V/
INVALID, MII Receive Error (RXER) if
during MII Receive Data Valid (RXDV)
INVALID, MII Receive Error (RXER) if
during MII Receive Data Valid (RXDV)
INVALID, MII Receive Error (RXER) if
during MII Receive Data Valid (RXDV)
INVALID, MII Receive Error (RXER) if
during MII Receive Data Valid (RXDV)
INVALID, MII Receive Error (RXER) if
during MII Receive Data Valid (RXDV)
INVALID, MII Receive Error (RXER) if
during MII Receive Data Valid (RXDV)
Table 7.2 4B/5B Code Table (continued)
INTERPRETATION
Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
RECEIVER
DATASHEET
92
INVALID
INVALID
INVALID
INVALID
INVALID
INVALID
INTERPRETATION
TRANSMITTER
SMSC LAN9303/LAN9303i
Section 7.1.1, "PHY
Datasheet
Related parts for LAN9303i
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
FAST ETHERNET PHYSICAL LAYER DEVICE
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
357-036-542-201 CARDEDGE 36POS DL .156 BLK LOPRO
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
357-036-542-201 CARDEDGE 36POS DL .156 BLK LOPRO
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
357-036-542-201 CARDEDGE 36POS DL .156 BLK LOPRO
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
4-PORT USB2.0 HUB CONTROLLER
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
FDC37C672ENHANCED SUPER I/O CONTROLLER WITH FAST IR
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
COM90C66LJPARCNET Controller/Transceiver with AT Interface and On-Chip RAM
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
SMSC Corporation
Datasheet: