SMC Networks SMC91C95 - Manual (Page 78)

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
Register 2
Call ALLOCATE
Exit Driver Send
Read Allocation Result
Register