Rainbow Electronics DS3134 - Manual (Page 125)

DS3134
125 of 203
Transmit DMA Packet Handling Figure 8.2.1C
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
Packet 3
1st Descriptor
(EOF=0/CV=0)
Buffer 2
Packet 3
2nd Descriptor
(EOF=0/CV=0)
Buffer 3
Packet 3
Last Descriptor
(EOF=1/CV=1)
Buffer 1
Packet 4
Last Descriptor
(EOF=1/CV=0)
Buffer 1
Packet 5
Last Descriptor
(EOF=1/CV=0)
Buffer 1
Packet 6
1st Descriptor
(EOF=0/CV=0)
Buffer 2
Packet 6
2nd Descriptor
(EOF=0/CV=0)
Buffer 3
Packet 6
Last Descriptor
(EOF=1/CV=0)
PV=1 PV=1
Next Pending
Descriptor Pointer
stored within the
Packet Descriptor
Last Pending Descriptor Pointer
Next Pending Descriptor Pointer
Next Descriptor Pointer
Start Descriptor Pointer
Next Pending
Descriptor Pointer
stored within the
Packet Descriptor
Transmit DMA Configuration RAM
dmatpf
Packet Chain
Column 1 Packet Chain
Column 2 Packet Chain
Column 3 Packet Chain
Column 4