lan91c100fd Standard Microsystems Corp., lan91c100fd Datasheet - Page 39

• Manufacturer Part Number: lan91c100fd
• Description: Lan91c100fd Rev. B Feast Fast Ethernet Controller With Full Duplex Capability
• Manufacturer: Standard Microsystems Corp.

ISR
Save Bank Select & Address
Ptr Registers
Mask SMC91C100FD
Interrupts
Read Interrupt Register
No
Yes
RX INTR?
Yes
TX INTR?
Call TX INTR or TXEMPTY
INTR
No
Call RXINTR
Get Next TX
ALLOC INTR?
Packet
No
Yes
Available for
Transmission?
Write Allocated Pkt # into
Yes
No
Packet Number Reg.
Call ALLOCATE
Write Ad Ptr Reg. & Copy Data
& Source Address
Enqueue Packet
EPH INTR?
Yes
No
Set "Ready for Packet" Flag
Restore Address Pointer &
Call EPH INTR
Bank Select Registers
Return Buffers to Upper Layer
Unmask SMC91C100FD
Interrupts
Disable Allocation Interrupt
Mask
Exit ISR
FIGURE 6 - INTERRUPT SERVICE ROUTINE
SMSC DS – LAN91C100FD REV. B
Page 39
Rev. 03-28-07