29-56
MPC8260 PowerQUICC II UserÕs Manual
MOTOROLA
Part IV. Communications Processor Module
Table 29-24 describes AAL0 protocol-speciÞc TCT Þelds.
29.10.2.3.4 VBR Protocol-SpeciÞc TCTE
Figure 29-34 shows the VBR protocol-speciÞc TCTE.
Table 29-25 describes VBR protocol-speciÞc TCTE Þelds.
Table 29-24. AAL0-Specific TCT Field Descriptions
Offset
Bits
Name
Description
0x10
0Ð7
Ñ
Reserved, should be cleared.
8
0
Must be 0.
9
CR10
CRC-10
0 CRC10 insertion is disabled.
1 CRC10 insertion is enabled.
10
Ñ
Reserved, should be cleared.
11
ACHC
ATM cell header change
0 Normal operation ATM cell header is taken from AAL0 buffer.
1 VPI/VCI (28 bits) are taken from TCT.
12Ð15
Ñ
Reserved, should be cleared.
0x12Ð
0x14
Ñ
Ñ
Reserved, should be cleared.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0x00
SCR
0x02
Burst Tolerance (BT)
0x04
Out of Buffer Rate (OOBR)
0x06
Sustain Rate Remainder (SRR)
SCR Fraction (SCRF)
0x08
Sustain Rate (SR)
0x0A
0x0C
VBR2
Ñ
0x0E-1E
Ñ
Figure 29-34. Transmit Connection Table Extension (TCTE)ÑVBR Protocol-
Specific
Table 29-25. VBR-Specific TCTE Field Descriptions
Offset
Bits
Name
Description
0x00
Ñ
SCR
Sustain cell rate. Holds the sustain cell rate (in slots) permitted for this channel according to
the trafÞc contract. To pace the channelÕs sustain cell rate, the APC performs a continuous-
state leaky bucket algorithm (GCRA).
0x02
Ñ
BT
Burst tolerance. Holds the burst tolerance permitted for this channel according to the trafÞc
contract. The relationship between the BT and the maximum burst size (MBS) is BT=(MBS-2)
´
(SCR-PCR) + SCR.
0x04
Ñ
OOBR Out-of-buffer rate. In out of buffer state (when the transmitter tries to open TxBD whose R bit
is not set) the APC reschedules the current channel according to OOBR rate.
Summary of Contents for MPC8260 PowerQUICC II
Page 1: ...MPC8260UM D 4 1999 Rev 0 MPC8260 PowerQUICC II UserÕs Manual ª ª ...
Page 66: ...lxvi MPC8260 PowerQUICC II UserÕs Manual MOTOROLA ...
Page 88: ...1 18 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part I Overview ...
Page 120: ...2 32 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part I Overview ...
Page 138: ...Part II iv MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part II Configuration and Reset ...
Page 184: ...4 46 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part II ConÞguration and Reset ...
Page 202: ...Part III vi MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 266: ...8 34 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 382: ...10 106 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 392: ...11 10 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
Page 430: ...Part IV viii MOTOROLA Part IV Communications Processor Module ...
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Page 980: ...A 4 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Appendixes ...
Page 1002: ...Index 22 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA INDEX ...
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