LAN9217 Datasheet, PDF (56/134 Pages) SMSC Corporation – 16-bit High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX

16-bit High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX
Datasheet
init
Last Packet
Idle
RX Interrupt
Read RX
Status
DWORD
Read RX
Packet
Not Last Packet
Figure 3.16 Host Receive Routine Using Interrupts
init
Last Packet
Read
RX_FIFO_
INf
Valid Status DWORD
Read RX
Status
DWORD
Read RX
Packet
Not Last Packet
Figure 3.17 Host Receive Routine with Polling
3.15.1.1
Receive Data FIFO Fast Forward
The RX data path implements an automatic data discard function. Using the RX data FIFO Fast
Forward bit (RX_FFWD) in the RX_DP_CTRL register, the host can instruct the LAN9217 to skip the
packet at the head of the RX data FIFO. The RX data FIFO pointers are automatically incremented to
the beginning of the next RX packet.
Revision 1.5 (07-18-06)
56
DATASHEET
SMSC LAN9217