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MPC8280 bảng dữ liệu(PDF) 1114 Page - Freescale Semiconductor, Inc

tên linh kiện MPC8280
Giải thích chi tiết về linh kiện  PowerQUICC??II Family Reference Manual
PDF  1386 Pages
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ATM AAL2
MPC8280 PowerQUICC II Family Reference Manual, Rev. 1
33-8
Freescale Semiconductor
The following figures provide examples of partial fill mode operation:
33.3.4
No STF Mode
The no-STF (no start of frame) mode enables the transmission of 48-byte packets by not including the STF
byte in the CPS PDU. The no-STF mode should always be used with PFT programmed to 47 in order to
prevent split and partial packets. For the AAL2 channels that use this mode, packets must not be larger
than a maximum packet size of 48.
The user activates this mode per ATM channel by doing the following:
1. Setting TCT[NoSTF]=1 and TCT[PFM]=1
2. Establishing a partial fill threshold by programming TCT[PFT]=47
The following figure shows a cell using no-STF mode:
Cell
STF
AAL2
AAL2
AAL2
AAL2
packet 2
packet 3
packet 4
packet 5
Padding
header
AAL2
packet 1
Transmit
1. Five packets fit exactly within the PFT limit
Cell
STF
AAL2
AAL2
packet 2
packet 3
Empty
header
AAL2
packet 1
PFT
0
PFT
Cell
STF
AAL2
packet 2
Padding
header
AAL2
packet 1
Transmit
PFT
2. Because PFT is less than the combined lengths of packet 1, packet 2 and packet 3,
the ATM cell is sent only with packets 1 and 2. (Packet 3 will be sent with the next cell.)
0
0
Remove packet 3
Cell
STF
Padding
header
AAL2
packet 1
PFT
3. Because the first packet exceeds the PFT value, the CPS-PDU consists only of this packet
(and the unused octets are padded with zeros).
0
Transmit
Cell
AAL2 packet of 48 bytes
header
0



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