參數(shù)資料
型號(hào)： MT92220
廠商： ZARLINK SEMICONDUCTOR INC
元件分類(lèi)： 數(shù)字傳輸電路
英文描述： 1023 Channel Voice Over IP/AAL2 Processor
中文描述： ATM NETWORK INTERFACE, PBGA608
封裝： 31 X 31 MM, 2.50 MM HEIGHT, MS-034, EPBGA-608
文件頁(yè)數(shù)： 62/210頁(yè)
文件大?。?/td> 1536K
代理商： MT92220
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Data Sheet
MT92220
62
Zarlink Semiconductor Inc.
To perform all of these functions, the RX AAL2 VC module uses an RX AAL2 VC structure to contain its context and
report diagnostics. RX AAL2 VC structure is pointed to by entry in Utopia Lookup Table. The format of this structure
is the following:
Table 21 - RX AAL2 VC Structure
V0
Pending Cell Handle 0 Valid. When this bit is set, one or two cells are pending
AAL2 disassembly due to a straddling packet.
V1
Pending Cell Handle 1 Valid. When this bit is set, two cells are pending AAL2
disassembly due to a straddling packet (straddling two cells).
Pending Cell Handle 0
This field contains the pointer to the most recently received cell pending AAL2
disassembly due to a straddling packet.
Pending Cell Handle 1
This field contains the pointer to the second most recently received cell pending
AAL2 disassembly due to a straddling packet.
V
VC Valid. When ‘0’, all cells processed by this RX AAL2 VC structure will be
discarded.
SN
Last received AAL2 STF Sequence Number.
Bytes Left Pending
This field indicates the number of bytes of CPS header and payload that have
been received, but that are still waiting for CPS packet completion before being
freed from memory.
RX AAL2 CID Translation
Structure
This pointer points to the RX AAL2 CID Translation Structure (in increment of1K
bytes). The CID of received AAL2 CPS packets will be used in index in this table.
LST
Lost field. When ‘1’, the next cell to be received will be treated independently of
all previous cells that were received. The Sequence Number and the Offset will
be accepted no matter the previous packet reception state. When an AAL2 VC is
started, when an STF parity error is detected and when Middle HEC errors occur,
this bit will be set.
Received Byte Count
Received Byte Count is the total number received bytes in all CPS-packets that
were completely received. The number of bytes in a CPS-packet is defined as
LI+4.
Received Cell Count
Received Cell Count is the total number of cells received on this AAL2 VC.
Middle HEC Error
This field is a counter of all the AAL2 HEC errors encountered in all received
CPS packets whose header was completely contain in a single cell.
Sequence Number Error
This field is a counter of all the AAL2 Sequence Number errors encountered in all
received AAL2 cells.
Table 22 - Fields and Description
b24
b25
Pending Cell Handle 0 [14:0]
b26
b27
b28
b29
b30
b31
V0
+4
b16
b17
b18
b19
b20
b21
b22
b23
b8
b9
b10
b11
b12
b13
b14
b15
V
b0
b1
b2
b3
b4
b5
Bytes Left Pending [6:0]
b6
b7
SN
Pending Cell Handle 1 [14:0]
Received Cell Count [31:0]
Received Byte Count [31:0]
+8
+C
+0
V1
LST
RX AAL2 CID Translation Structure [24:10]
+10
Middle HEC Error [7:0]
Sequence Number Error [7:0]
Parity Error [7:0]
Offset / LI Error [7:0]
Straddling HEC Error [7:0]
Offset > 47 Error [7:0]
Incomplete Packet Lost [7:0]
CID Discard Packet Received [7:0]
+14
+18
+1C
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