SC92031L SILAN [Silan Microelectronics Joint-stock], SC92031L Datasheet - Page 20

• Manufacturer Part Number: SC92031L
• Description: 10/100 MBPS INTEGRATED PCI ETHERNET MEDIA ACCESS CONTROLLER AND PHYSICAL LAYER
• Manufacturer: SILAN [Silan Microelectronics Joint-stock]

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In loopback mode for 100Mbps, the SC92031 takes frames from the transmit descriptor and transmits them up to
internal Twister logic.
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scrambler, parallel-to-serial converter, NRZ-to-NRZI converter and NRZI-to-MLT3. While operating in 10Base-T
mode, the SC92031 typically performs parallel-to-serial converter and Manchester process which combines clock
and NRZ data such that the first half of the data bit contains the complement of the data, and the second half of
the data bit contains the true data.
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the SC92031 transmits. If the collision was detected during the preamble transmission, the jam pattern is
transmitted after completing the preamble (including the JK symbol pair).
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PAUSE packet to achieve flow control task.
1. Control Frame Transmission
pause_time(=FFFFh) to inform the source station to stop transmission for the specified period of time. After the
driver has processed the packets in the receive buffer and updated the boundary pointer, the SC92031 sends the
other PAUSE packet with pause_time(=0000h) to wake up the source station to restart transmission.
2. Control Frame Reception
pause_time(=n). If the PAUSE packet is received while the SC92031 is transmitting, the SC92031 starts to back
off after current transmission completes. The SC92031 is free to transmit the next packets when it receives a
valid PAUSE packet with pause_time(=0000h) or the back off timer(=n*512 bit time) elapses.
EEPROM (93C46) Contents
by words showed as below for convenience. After the valid duration of the RSTB pin or auto-load command in
the 93C46, the SC92031 performs a series of EEPROM read operations from the 93C46 addresses 00H to 3FH.
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Loopback mode is normally used to verify that the logic operations up to the Ethernet cable function correctly.
While operating in 100Base-TX mode, the SC92031 performs typically encoding steps of 4B5B encoder,
The decoder procedure either in 10Mbps or 100Mbps mode is just a reverse of encoder.
If the SC92031 is not in the full-duplex mode, a collision event occurs when the receive input is not idle while
The SC92031 supports IEEE802.3X flow control to improve performance in full-duplex mode. It detects
When the SC92031 detects that its free receive buffer is less than 3K bytes, it sends a PAUSE packet with
The SC92031 enters a back off state for a specified period of time when it receives a valid PAUSE packet with
The 93C46 is a 1K-bit serial EEPROM, it can be organized by 64 words or 128 bytes. Now we list its contents
Loopback Operation
Tx En/decoder
Collision
Flow Control
REV:1.0
SC92031
Page 20 of 38
2004.08.03