SMC Networks SMC91C95 Manuel d'utilisateur télécharger pdf (Page 78)

FIGURE 15 - DRIVER SEND AND ALLOCATE ROUTINES

ALLOCATE

Issue "Allocate Memory"

Command to MMU

Read Interrupt Status Register

Enqueue Packet

Set "Ready for Packet" Flag

Return

Copy Remaining TX Data

Packet into RAM

Return Buffers to Upper Layer

Write Allocated Packet into

Packet # Register

Write Address Pointer Register

Copy Part of TX Data Packet

into RAM

Write Source Address into

Proper Location

Store Data Buffer Pointer

Clear "Ready for Packet" Flag

Enable Allocation Interrupt

Allocation

Passed?

Yes No

DRIVER SEND

Choose Bank Select

Call ALLOCATE

Exit Driver Send

Read Allocation Result

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 138 139

Pas de commentaire

SMC Networks SMC91C95 Manuel d'utilisateur Page 78