lan91c100 Standard Microsystems Corp., lan91c100 Datasheet - Page 55
lan91c100
Manufacturer Part Number
lan91c100
Description
Feast ? Ast Ethernet Controller
Manufacturer
Standard Microsystems Corp.
Datasheet
1.LAN91C100.pdf
(101 pages)
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ISR
Save Bank Select & Address
Ptr Registers
Mask SMC91C100 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 SMC91C100
Interrupts
Disable Allocation Interrupt
Mask
Exit ISR
55
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