Nec Network Controller uPD98502 Manuale Utente Pagina 263

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CHAPTER 4 ATM CELL PROCESSOR
Preliminary User’s Manual S15543EJ1V0UM
263
Figure 4-24. Work RAM Usage
Packet Info Structure
Pool
(4 W ords x 64)
Free Block Pool
/for VC Table/
(16 W ords x 64)
Temporary Data
4096 bytes
1024 bytes
64 bytes
Flow Table Pool
(4 W ords x 64)
1024 bytes
Pool Descriptor
(2 W ords x 8)
xx80_0000H
xx80_0040H
xx80_1040H
xx80_1440H
xx80_1840H
xx80_3FFFH
Work RAM (10 Kbytes)
4.8.2 Transmission function
VR
4120A sets the VC information in VC table prior to the every packet transmission, and issue Tx_Ready
command with VC number in order to transmit packet belongs to the VC.
The transmitting data structure is described in Section 4.5.1 Tx buffer structure.
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