MT90502_06 Datasheet, PDF (67/205 Pages) Zarlink Semiconductor Inc – Multi-Channel AAL2 SAR

MT90502
Data Sheet
RX TDM Control Memory Structure (HDLC Streams)
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
+0h
Local WP
Negative Offset [6:0]
+2h
Local RP
Fetch WP
CPSP Read End of Packet Pnt [9:0]
+4h
CPS-Packet Disassembly Struct Num [9:0]
CPSPDQ Length [7:3]
+6h
CPSPDQ RP [11:0]
CPSPDQL [2:0] 0
+8h
CPSPDQ WP [11:0]
+10h
+12h
Negative Offset [5;0]
CPSP Read
End of Packet Pnt [9:0]
+14h NO7
CPS-Packet Dis Struct Num
[9:0]
+16h
Negative Offset [5:0]
CPSP Read
End of Packet Pnt [9:0]
+18h NO7
CPS-Packet Dis Struct Num
[9:0]
+20h
+22h
Negative Offset [5:0]
CPSP Read
End of Packet Pnt [9:0]
+24h NO7
CPS-Packet Dis Struct Num
[9:0]
+26h
Negative Offset [5:0]
CPSP Read
End of Packet Pnt [9:0]
+28h NO7
CPS-Packet Dis Struct Num
[9:0]
+30h
+32h
Negative Offset [5:0]
CPSP Read
End of Packet Pnt [9:0]
+34h NO7
CPS-Packet Dis Struct Num
[9:0]
+36h
Negative Offset [5:0]
CPSP Read
End of Packet Pnt [9:0]
+38h NO7
CPS-Packet Dis Struct Num
[9:0]
+40h
+42h
Negative Offset [5:0]
CPSP Read
End of Packet Pnt [9:0]
+44h NO7
CPS-Packet Dis Struct Num
[9:0]
+46h
Negative Offset [5:0]
CPSP Read
End of Packet Pnt [9:0]
+48h NO7
CPS-Packet Dis Struct Num
[9:0]
Base HDLC structure
for all HDLC Streams
Second HDLC structure
on a HDLC stream
Third and up to N
successive HDLC
structures on a
HDLC stream
Reserved
Fields in Italic are used by the Hardware only.
Fields in Plain are written to by the CPU/Software.
RX TDM Control Memory structures for HDLC Streams are located in internal memory at addresses C000h to FFF0h.
CPS-Packet Disassembly
Structure Number: Pointer to the AAL2 channel associated with this HDLC stream. This field is used to locate the RX Circular Buffer in
SSRAM.
CPSPDQ Length: Packet Descriptor Queue Length. Set to the number of timeslots in the stream. 01h = 1 TSST, 02h = 2 TSST, Max
size is 128.
Local WP/RP
and Fetch WP:
Pointer to the pre-fetched HDLC packet handles contained in the 2/3/4/channel add on and the 5+ channel add-on.
They must be initialized to 0h by software on HDLC stream start-up.
CPSPDQ RP/WP: Read/write pointer to this HDLC stream’s Packet Descriptor Queue (PDQ) in SSRAM.
CPSP Read End
of Packet Pnt: Pointer to the last octet in HDLC packet in the RX Circular Buffer.
Negative Offset: Current negative offset from the end of packet pointer at which the next byte of the HDLC packet will be read.
Figure 31 - RX TDM Control Memory Structure (HDLC Streams)
67
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