SMC Networks SMC91C95 Manual do Utilizador descarregar pdf (Página 73)

FIGURE 10 - ETHERNET INTERRUPT SERVICE ROUTINE

ISR

Save Bank Select & Address

Ptr Registers

Mask 91C94 Interrupts

Read Interrupt Register

Call TX INTR or TXEMPTY

INTR

TX INTR?

Get Next TX

RX INTR?

Yes

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?

NoYes

Call EPH INTR

Set "Ready for Packet" Flag

Return Buffers to Upper Layer

Disable Allocation Interrupt

Mask

Restore Address Pointer &

Bank Select Registers

Unmask 91C94 Interrupts

Exit ISR

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SMC Networks SMC91C95 Manual do Utilizador Página 73