29-18
MPC8260 PowerQUICC II UserÕs Manual
MOTOROLA
Part IV. Communications Processor Module
Figure 29-7 shows the VP pointer address compression from Table 29-5.
Figure 29-7. VP Pointer Address Compression
29.4.2.2 VC-Level Address Compression Tables (VCLTs)
Each VPLT entry points to a single VCLT. Like the VPLT, the size of each VCLT depends
on VC_MASK. Because the VCLT contains word entries, if VC_MASK =
0b11_1111_1111, the table is 4 Kbytes. The address of an entry in this table is VCT_BASE
+ VCOFFSET
´
4 + VCpointer
´
4.
The MPC8260 can check that all unallocated VCI bits are 0 by setting GMODE[CUAB]
(check unallocated bits). If they are not, the cell is considered a misinserted cell.
An example of VC-level table entry address calculation is shown in Table 29-6. Note that
VCOFFSET is assumed to be 0x100 for this example.
Figure 29-8 shows the VC pointer address compression from Table 29-6.
Figure 29-8. VC Pointer Address Compression
29.4.3 Misinserted Cells
If the address lookup mechanism cannot find a match (MS=1), the cell is discarded and
ATM layer statistics are updated, as described in Section 29.8, ÒATM Layer Statistics.Ó
Table 29-6. VC-Level Table Entry Address Calculation Example
VCT_BASE
VCOffset
VC-Level Table Size
VC_MASK
VCI
VC Pointer
VC Entry Address
0x0084_0000
0x0100
32 entries
0x0037
0x0031
0x19
VC Base = 0x840000
0x100 x 4 = 0x000400
0x19 x 4 = 0x000064
0x840464
0
0
0
0
0
0
0
1
0
0
0
1
0
0
1
0
0
0
1
1
0
1
1
1
0
0
1
PHY+VPI
VP_MASK
VP Pointer
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
1
0
0
0
0
0
0
1
1
0
1
1
1
0
0
1
VCI
VC_MASK
VC Pointer
1
1
0
0
0
0
0
0
0
0
Содержание MPC8260 PowerQUICC II
Страница 1: ...MPC8260UM D 4 1999 Rev 0 MPC8260 PowerQUICC II UserÕs Manual ª ª ...
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Страница 66: ...lxvi MPC8260 PowerQUICC II UserÕs Manual MOTOROLA ...
Страница 88: ...1 18 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part I Overview ...
Страница 120: ...2 32 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part I Overview ...
Страница 138: ...Part II iv MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part II Configuration and Reset ...
Страница 184: ...4 46 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part II ConÞguration and Reset ...
Страница 202: ...Part III vi MPC8260 PowerQUICC II UserÕs Manual MOTOROLA Part III The Hardware Interface ...
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Страница 430: ...Part IV viii MOTOROLA Part IV Communications Processor Module ...
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Страница 1002: ...Index 22 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA INDEX ...
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