參數(shù)資料
型號: DS3131
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: Telecom IC:Other
英文描述: SPECIALTY TELECOM CIRCUIT, PBGA256
封裝: 27 X 27 MM, PLASTIC, BGA-256
文件頁數(shù): 5/174頁
文件大?。?/td> 1261K
代理商: DS3131
DS3131
102 of 174
Figure 9-13. Transmit DMA Priority Packet Handling
Buffer 1
Packet 1
1st Descriptor
(EOF=0/CV=0)
Buffer 2
Packet 1
2nd Descriptor
(EOF=0/CV=0)
Buffer 3
Packet 1
Last Descriptor
(EOF=1/CV=1)
Buffer 1
Packet 2
Last Descriptor
(EOF=1/CV=0)
Buffer 1
Pri. Packet 1
1st Descriptor
(EOF=0/CV=0)
Buffer 2
Pri. Packet 1
Last Descriptor
(EOF=1/CV=1)
Buffer 1
Pri. Packet 2
Last Descriptor
(EOF=1/CV=0)
Buffer 1
Pri. Packet 3
Last Descriptor
(EOF=1/CV=0)
Buffer 1
Pri. Packet 4
1st Descriptor
(EOF=0/CV=0)
Buffer 2
Pri. Packet 4
2nd Descriptor
(EOF=0/CV=0)
Buffer 3
Pri. Packet 4
Last Descriptor
(EOF=1/CV=0)
Next Descriptor Pointer
Start Descriptor Pointer
Transmit DMA Configuration RAM
Normal
Path if No
Priority
Packets
Had
Occurred
Service
Priority
Packets
All Priority Packets Have Been Serviced
Next Pending Descriptor Pointer
Last Pending Descriptor Pointer
Next Pending Descriptor Pointer
Next Descriptor Pointer
Last Pending Descriptor Pointer
Standard Queue Pointers
Priority Queue Pointers
Note 1:
The start descriptor pointer field in the transmit DMA configuration RAM is used by both the normal and
priority pending queues.
See
Note 1
PV = 1
Next Pending
Descriptor Pointer
stored within the
Packet Descriptor
Standard
Packet Chain
Column 1
Priority
Packet Chain
Column 2
Priority
Packet Chain
Column 3
Priority
Packet Chain
Column 4
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