Nec Network Controller uPD98502 Uživatelský manuál Strana 258

  • Stažení
  • Přidat do mých příruček
  • Tisk
  • Strana
    / 595
  • Tabulka s obsahem
  • KNIHY
  • Hodnocené. / 5. Na základě hodnocení zákazníků
Zobrazit stránku 257
CHAPTER 4 ATM CELL PROCESSOR
258
Preliminary User’s Manual S15543EJ1V0UM
4.7.1 Set_Link_Rate command
This command is used to set the link rate of ATM PHY interface. After initializing ATM Cell Processor, this
command has to be issued once, before any packet is transmitted.
Figure 4-18. Set_Link_Rate Command
[Set_Link_Rate command]
CMR
0 1 1 1 0 PHY No. Link Rate
31 30
2
9
28 27 26 20 19 16 15 0
PHY No. PHY Number.
Link Rate Actual Link Rate is inserted in this field. The format of the rate is following.
2
e
(1 + m/512)*nz cells/sec
Re-
served
nz e m
15 14 13 9 8 0
4.7.2 Open_Channel command
This command is used to open a new channel to be used for a send or receive operation. When the channel is
opened, ATM Cell Processor reserves the area for the VC table in Work RAM and returns the VC Number as an
indication.
The indication that ATM Cell Processor returns for this command is of the following format:
Figure 4-19. Open_Channel Command and Indication
[Open_Channel command]
CMR
0 1000 0
31 30 29 28 27 26 25 0
[Open_Channel command Indication]
CMR
Undefined VC Number 0
31 18 17 6 5 0
VC Number VC Number of the opened channel. If no more new VCs can be opened, VC Number in the
indication is set to 0.
Zobrazit stránku 257
1 2 ... 253 254 255 256 257 258 259 260 261 262 263 ... 594 595

Komentáře k této Příručce

Žádné komentáře