LAN91C100-FD-SS SMSC [SMSC Corporation], LAN91C100-FD-SS Datasheet - Page 38
LAN91C100-FD-SS
Manufacturer Part Number
LAN91C100-FD-SS
Description
FEAST Fast Ethernet Controller with Full Duplex Capability
Manufacturer
SMSC [SMSC Corporation]
Datasheet
1.LAN91C100-FD-SS.pdf
(67 pages)
- Current page: 38 of 67
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SMSC DS – LAN91C100FD REV. B
1 ENABLE RECEPTION - By setting the RXEN
2
3
4
5 SERVICE INTERRUPT - Read the Interrupt
bit.
Status Register and determine if RCV INT is set.
The next receive packet is at receive area. (Its
packet number can be read from the FIFO Ports
Register). The software driver can process the
packet by accessing the RX area, and can move
it out to system memory if desired.
processing is complete the CPU issues the
REMOVE AND RELEASE FROM TOP OF RX
command to have the MMU free up the used
memory and packet number.
S/W DRIVER
TYPICAL FLOW OF EVENTS FOR RECEIVE
When
Page 38
A packet is received with matching address.
Memory is requested from MMU.
number is assigned to it. Additional memory is
requested if more pages are needed.
The internal DMA logic generates sequential
addresses and writes the receive words into
memory.
physical address translation. If overrun, packet
is dropped and memory is released.
When the end of packet is detected, the status
word is placed at the beginning of the receive
packet in memory. Byte count is placed at the
second word. If the CRC checks correctly the
packet number is written into the RX FIFO. The
RX FIFO, being not empty, causes RCV INT
(interrupt) to be set.
packet memory is released and no interrupt will
occur.
The MMU does the sequential to
MAC SIDE
If CRC is incorrect the
A packet
Rev. 01-20-06
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