MPC8280 datasheet(977/1386 Pages) FREESCALE

977 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

31-17

The MPC8280 can check that all unallocated bits of the PHY + VPI are 0 by setting GMODE[CUAB]

(check unallocated bits) in the parameter RAM. If they are not, the cell is considered a misinserted cell.

Table 31-5 gives an example of VP-level table entry address calculation.

Figure 31-7 shows the VP pointer address compression from Table 31-5.

Figure 31-7. VP Pointer Address Compression

31.4.2.2

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 MPC8280 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 31-6. Note that VCOFFSET is

assumed to be 0x100 for this example.

0xA007

25 = 32 entries

64 + 8 = 72

72 + 32 = 104

Table 31-5. VP-Level Table Entry Address Calculation Example

VPT_BASE

VP-Level Table Size

VP_MASK

PHY+VPI

VP Pointer

VP Entry Address

0x0024_0000

64 entries

0x0237

0x0011

0x09

VP Base = 0x240000

0x09 x 4 = 0x000024

0x240024

Table 31-6. 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

Table 31-4. VCOFFSET Calculation Examples for Contiguous VCLTs (continued)

VP-Level

Table Entry

VC_MASK

Number of Ones

in VC_MASK

VC-Level

Table Size

VCOFFSET

PHY+VPI

VP_MASK

VP Pointer

0000

MPC8280 Datasheet(PDF) 977 Page - Freescale Semiconductor, Inc

MPC8280 Datasheet(HTML) 977 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL