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LAN91C100FD Datasheet(PDF) 49 Page - SMSC Corporation

Part # LAN91C100FD
Description  FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY
PDF  79 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN91C100FD Datasheet(HTML) 49 Page - SMSC Corporation

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FEAST Fast Ethernet Controller with Full Duplex Capability
SMSC DS – LAN91C100FD Rev. D
Page 49
Rev. 10/14/2002
PRELIMINARY
Figure 5.7 - Drive Send and Allocate Routines
5.5
Memory Partitioning
Unlike other controllers, the LAN91C100FD does not require a fixed memory partitioning between transmit
and receive resources. The MMU allocates and de-allocates memory upon different events. An additional
mechanism allows the CPU to prevent the receive process from starving the transmit memory allocation.
ALLOCATE
Issue "Allocate Memory"
Command to MMU
Read Interrupt Status Register
Enqueue Packet
Set "Ready for Packet" Flag
Return
Copy Remaining TX Data
Packet into RAM
Return Buffers to Upper Layer
Write Allocated Packet into
Packet # Register
Write Address Pointer Register
Copy Part of TX Data Packet
into RAM
Write Source Address into
Proper Location
Store Data Buffer Pointer
Clear "Ready for Packet" Flag
Enable Allocation Interrupt
Allocation
Passed?
Yes
No
DRIVER SEND
Choose Bank Select
Register 2
Call ALLOCATE
Exit Driver Send
Read Allocation Result
Register



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