mt90502ag2 Zarlink Semiconductor, mt90502ag2 Datasheet - Page 29

• Manufacturer Part Number: mt90502ag2
• Description: Multi-channel Aal2 Sar
• Manufacturer: Zarlink Semiconductor

TX CAM Notes:
•
•
•
•
•
•
•
The TX CAM consists of 1024 8-byte structures in internal memory at addresses 4000h to 5FF8h.
One TX CAM entry exists for each selected TSST.
The HDLC Stream/xx PCM Channel Number is used to locate the CPS-Packet assembly structure, the CPS-Packet final assembly
structure (see Figures 12, 13, 14, 15 and 16) and the CPS-Packet buffer for the associated TSST.
Link to next entry: A pointer to the next entry in the linked list of TX CAM entries. 000h indicates the end of the linked list (return to
start). Entry 0 in the linked list is always examined at the start of frame and is never associated to a valid TDM channel.
The TX CAM entries are each consulted once every frame.
TX CAM entries can exist in any order in memory but must be linked in order of TSST.
XPI: External Phase Indicator: “00” = 24 frame phase; “01” = 80 frame phase; “10” = 64 frame phase (also used for 8, 16 and 32
frame phase); “11” = 88 frame phase
+0
+2
+4
+6
+0
+2
+4
+6
+0
+2
+4
+6
b15 b14 b13
b15 b14 b13 b12 b11 b10
b15 b14 b13 b12 b11 b10
Figure 4 - TX Channel Association Memory (TX CAM)
b12
HDLC Stream or xxPCM Channel Structure
b11
Phasing Channel Structure
LLL Channel Structure
b10
1
0
Zarlink Semiconductor Inc.
1
MT90502
b9
b9
0
b9
0
b8
b8
0
29
HDLC Stream/xxPCM Channel Number
00LL
b8
b7
b7
TSST[11:0]
1
TSST[11:0]
TSST[11:0]
b7
0
b6
b6
0
Link to next entry
Link to next entry
Link to next entry
b6
b5
b5
0
b5
LLL Channel Number
b4
b4
0
b4
b3
b3
0
b3
b2
b2
0
b2
b1
b1
b1
XPI
b0
b0
b0
Reserved
Data Sheet