lan91c95 Standard Microsystems Corp., lan91c95 Datasheet - Page 92

• Manufacturer Part Number: lan91c95
• Description: Isa/pcmcia Full Duplex Single-chip Ethernet And Modem Controller With Ram
• Manufacturer: Standard Microsystems Corp.

Choose Bank Select
Call ALLOCATE
Exit Driver Send
DRIVER SEND
Register 2
FIGURE 15 - DRIVER SEND AND ALLOCATE ROUTINES
Write Address Pointer Register
Return Buffers to Upper Layer
Copy Part of TX Data Packet
Set "Ready for Packet" Flag
Write Allocated Packet into
Write Source Address into
Copy Remaining TX Data
Read Allocation Result
Packet # Register
Enqueue Packet
Proper Location
Packet into RAM
into RAM
Register
Yes
92
Read Interrupt Status Register
Issue "Allocate Memory"
Command to MMU
ALLOCATE
Allocation
Passed?
Return
Clear "Ready for Packet" Flag
No
Enable Allocation Interrupt
Store Data Buffer Pointer