29-57
MPC8260 PowerQUICC II UserÕs Manual
MOTOROLA
Part IV. Communications Processor Module
29.10.2.3.5 UBR+ Protocol-SpeciÞc TCTE
Figure 29-35 shows the UBR+ protocol-speciÞc TCTE.
Table 29-26 describes UBR+ protocol-speciÞc TCTE Þelds.
0x06
0Ð7
SRR
Sustain rate remainder. Holds the sustain rate remainder after adding the pace fraction Þeld
to the additive channel sustain rate. Used by the APC to calculate the channel GCRA (leaky
bucket) state. Initialized to 0.
8Ð15
SCRF Holds the sustain cell rate fraction of this channel in units of 1/256 slot.
0x08
Ñ
SR
Sustain rate. Used by the APC to hold the sustain rate after adding the pace Þeld to the
additive channel sustain rate. Used by the APC to calculate the channel GCRA (leaky
bucket) state.
0x0C
0
VBR2
VBR type
0 Regular VBR. CLP=0+1 cells are rescheduled by PCR or SCR according to the GCRA
state.
1 VBR Type 2. CLP=0 cells are rescheduled by PCR or SCR according to the GCRA state.
CLP=1 cells are rescheduled by PCR.
1Ð15
Ñ
Reserved, should be cleared.
0x0EÐ
0x1E
Ñ
Ñ
Reserved, should be cleared.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0x00
MCR
0x02
Ñ
MCR Fraction (MCRF)
0x04
Maximum Delay Allowed (MDA)
0x06Ð0x1E
Ñ
Figure 29-35. UBR+ Protocol-Specific TCTE
Table 29-26. UBR+ Protocol-Specific TCTE Field Descriptions
Offset
Bits
Name
Description
0x00
Ñ
MCR
Minimum cell rate for this channel. MCR is in units of APC time slots.
0x02
0Ð7
Ñ
Reserved, should be cleared.
8Ð
15
MCRF Minimum cell rate fraction. Holds the minimum cell rate fraction of this channel in units of 1/
256 slot.
0x04
Ñ
MDA
Maximum delay allowed. The maximum time-slot service delay allowed for this priority level
before the APC reduces the scheduling rate from PCR to MCR.
0x06Ð
0x1E
Ñ
Ñ
Reserved, should be cleared.
Table 29-25. VBR-Specific TCTE Field Descriptions (Continued)
Offset
Bits
Name
Description
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 ...
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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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