TXC-04222-AIOG Transwitch Corporation, TXC-04222-AIOG Datasheet - Page 64

• Manufacturer Part Number: TXC-04222-AIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-04222-AIOG

• Screening Level: Industrial
• Package Type: BGA
• Lead Free Status / Rohs Status: Not Compliant

June 2003
TEMx28
TXC-04222
TXC-04222-MB, Ed. 6
Fifty-six independent pointer-tracking state machines are used in the TEMx28, one for each channel in the A
and B drop buses. The values of the V1/V2 pointer bytes in each multiframe are provided in registers X+183H
and X+184H for the A side, and registers X+203H and X+204H for the B side. The pointer tracking algorithm is
illustrated in the following Figure 32. The pointer tracking state machine is based on the pointer tracking state
machine defined in the ETSI and ANSI requirements. When control bit PTALTE (bit 1, 01BH) is 0, the transition
from AIS to LOP is disabled (shown dotted).
The AIS Indication (A/BnAIS) is provided in bit 3 of registers X+111/X+191H.
The LOP Indication (A/BnLOP) is provided in bit 2 of registers X+111/X+191H.
The NDF Indication (A/BnNDF) is provided in bit 1 of registers X+111/X+191H.
The Wrong Size Indication (A/BnSIZE) is provided by bit 0 of registers X+111/X+191H.
The Positive Justification Counter is located in registers X+120H for the A side and X+1A0H for the B side.
The Negative Justification Counter is located in registers X+121H for the A side and X+1A1H for the B side.
(Accept New Offset)
(Accept New Offset)
NDF_enable
NDF_enable
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NDF
INC
(Offset Undefined)
8 x NDF_enable
Figure 32. VT/TU Pointer Tracking State Machine
(Accept New Offset)
(Accept New Offset)
(Accept New Offset)
(Accept New Offset)
3 x new_point
3 x any_point
DATA SHEET
NDF_enable
3 x new_point
3 x any_point
(Incr. Offset)
NDF_enable
inc_ind
LOP
(Offset Undefined)
(Accept New Offset)
(Accept New Offset)
8 x inv_point
(Offset Undefined)
3 x new_point
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NDF_enable
3 x AIS_ind
(Offset Undefined)
(Offset Undefined)
(Offset Undefined)
3 x AIS_ind
8 x inv_point
3 x AIS_ind
NORM
(Accept New Offset)
(Accept New Offset)
(Accept New Offset)
3 x new_point
3 x new_point
(Offset Undefined)
3 x new_point
3 x any_point
(Decr. Offset)
3 x AIS_ind
dec_ind
DEC
AIS
(Offset Undefined)
3 x AIS_ind