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LAN91C100FDREVB Fiches technique(PDF) 39 Page - SMSC Corporation

No de pièce LAN91C100FDREVB
Description  FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY
PDF  68 Pages
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Fabricant  SMSC [SMSC Corporation]
Site Internet  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN91C100FDREVB Fiches technique(HTML) 39 Page - SMSC Corporation

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SMSC DS – LAN91C100FD REV. B
Page 39
Rev. 05/31/2000
FIGURE 6 - INTERRUPT SERVICE ROUTINE
ISR
Save Bank Select & Address
Ptr Registers
Mask SMC91C100FD
Interrupts
Read Interrupt Register
Call TX INTR or TXEMPTY
INTR
TX INTR?
Get Next TX
RX INTR?
Yes
No
No
Yes
Call RXINTR
ALLOC INTR?
No
Yes
Write Allocated Pkt # into
Packet Number Reg.
Write Ad Ptr Reg. & Copy Data
& Source Address
Enqueue Packet
Packet
Available for
Transmission?
Yes
No
Call ALLOCATE
EPH INTR?
No
Yes
Call EPH INTR
Set "Ready for Packet" Flag
Return Buffers to Upper Layer
Disable Allocation Interrupt
Mask
Restore Address Pointer &
Bank Select Registers
Unmask SMC91C100FD
Interrupts
Exit ISR



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