MT90520AG ZARLINK [Zarlink Semiconductor Inc], MT90520AG Datasheet - Page 127

• Manufacturer Part Number: MT90520AG
• Description: 8-Port Primary Rate Circuit Emulation AAL1 SAR
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

6.2.5
Address: 202A (Hex)
Label: DRCCR
Reset Value: 0000 (Hex)
CELL_COUNTER
Address: 2028 (Hex)
Label: DRRPR
Reset Value: 007F (Hex)
Note: The read pointer value is set to “7Fh” upon start-up, pointing to the final location within the cell buffer. Upon the start of the first read
operation, software should increment the pointer to point to the first cell location.
Address: 2040 (Hex)
Label: SRCR
Reset Value: 00FF (Hex)
CB_BASE_ADD
SDT_INSERT_
SDT_DUMMY
Reserved
Reserved
DRRP
Label
Label
Label
LOST
SDT RX_SAR Module
Bit Position
Bit Position
Position
15:7
6:0
15:0
15:11
10:9
Bit
7:0
8
Table 49 - Data RX_SAR Read Pointer Register
Table 50 - Data RX_SAR Cell Counter Register
Type
R/W
Type
R/O
Table 51 - SDT Reassembly Control Register
Type
R/W
R/W
R/W
R/O
R/O
Data RX_SAR Cell Buffer Read Pointer.
Indicates the cell structure number which is currently being read by the CPU. This value
should not be incremented by the CPU at the end of a cell-read; therefore, if a read
operation is not in progress, the pointer indicates the cell location which was last read by
the microprocessor.
Always reads “0000_0000_0”.
SDT RX_SAR Dummy Cell Octet.
A 47-byte cell filled with this octet is inserted into the appropriate SDT Reassembly Circular
Buffer(s) when dummy cell insertion is required. Defaults to FFh, but should be set to
appropriate silence value for the TDM type.
SDT Insert Number of Lost Cells Flag.
When set, the number of dummy cells inserted into the SDT Reassembly Circular Buffer(s)
in the case of a multi-cell loss equals the number of lost cells (up to 6). When this bit is
cleared (default), a maximum of 2 dummy cells are inserted in a multi-cell loss case.
Reassembly Circular Buffer Base Address.
These bits form the 2 MSBs (bits<19:18>) of the external memory base addresses (in
words) of the SDT Reassembly Circular Buffers.
Always reads “0000_0”.
Number of cells received by the Data RX_SAR.
Zarlink Semiconductor Inc.
MT90520
127
Description
Description
Description
Data Sheet