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LAN91C94 Datasheet(PDF) 73 Page - SMSC Corporation

Part # LAN91C94
Description  ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM
PDF  120 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN91C94 Datasheet(HTML) 73 Page - SMSC Corporation

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FIGURE 16 – DRIVER SEND AND ALLOCATE ROUTINES
ALLOCATE
I ssue "Alloca te Memory "
Comman dt o MMU
R ead Int er rupt Status R egister
Enqu eue Pack et
Set "Ready for Packet" Flag
Ret urn
C opy RemainingTX Dat a
Packet int oR AM
R et urn Buff ers to U pper L ayer
Write Allocated Packet int o
Packet # Register
Wr ite Address Pointer
R egister
Copy Par t of TX Data Packet
into RAM
Write Sourc e Add re ss int o
Proper L ocation
Store Data Buf fer Pointer
Clear "Ready for Packet" Flag
Enable Allocat ion Interrupt
Allocation
Pass ed ?
Yes
No
D RIVER SEND
Ch oo se Bank Select
R egist er 2
Call ALLOCATE
Exit Driver Send
Read Allocat ion Result
R egister



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