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LAN91C100FD Datasheet(PDF) 43 Page - SMSC Corporation

Part # LAN91C100FD
Description  FEAST Fast Ethernet Controller with Full Duplex Capability
PDF  67 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN91C100FD Datasheet(HTML) 43 Page - SMSC Corporation

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SMSC DS – LAN91C100FD REV. B
Page 43
Rev. 01-20-06
FIGURE 10 - DRIVE SEND AND ALLOCATE ROUTINES
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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