參數(shù)資料
型號(hào): MT90520
廠商: Zarlink Semiconductor Inc.
英文描述: 8-Port Primary Rate Circuit Emulation AAL1 SAR
中文描述: 8端口基本速率電路仿真AAL1特區(qū)
文件頁(yè)數(shù): 126/180頁(yè)
文件大?。?/td> 1736K
代理商: MT90520
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MT90520
Data Sheet
126
Zarlink Semiconductor Inc.
Address: 2024 (Hex)
Label: DRCON
Reset Value: 0000 (Hex)
Label
Bit
Position
Type
Description
DRSIZE
1:0
R/W
Data RX_SAR Cell Buffer Size.
This field indicates the number of non-CBR data cells which can be held in the Data
RX_SAR’s Cell Buffer:
“00” = 16 cells
“01” = 32 cells
“10” = 64 cells
“11” = 128 cells.
DRBASE
12:2
R/W
Data RX_SAR Cell Buffer Base Address.
Represents address bits <19:9> that point to the
word
address of the first structure in the
cell buffer in external memory. The lower address bits <8:0> of the pointer are preset to
“0_0000_0000”.
Cell buffers must start on boundaries corresponding to the size of the buffer (e.g.,
32-cell buffers must start on boundaries which are integer multiples of 32 cells * 32
words/cell)
. As a result, in some cases, DRBASE<2:0> (bits<11:9> of the actual address)
must to be set to ‘0’, depending on the number of cells allocated in the cell buffer:
16
-cell buffer:
no restrictions
32
-cell buffer:
DRBASE<0> must equal ‘0’
(buffers start on 1024-word boundaries)
64
-cell buffer:
DRBASE<1:0> must equal “00”
(buffers start on 2048-word boundaries)
128
-cell buffer:
DRBASE<2:0> must equal “000”
(buffers start on 4096-word
boundaries).
Reserved
15:13
R/O
Always reads “000”.
Table 47 - Data RX_SAR Configuration Register
Address: 2026 (Hex)
Label: DRWPR
Reset Value: 0000 (Hex)
Label
Bit Position
Type
Description
DRWP
6:0
R/O
Data RX_SAR Cell Buffer Write Pointer.
Indicates the cell structure number which is currently being written by the Data RX_SAR
(the cell is not yet valid). This value is incremented at the end of each cell-write procedure
(indicates the
next
cell location to be written). Allowable values:
0h -> Fh (16-cell buffer)
0h -> 1Fh (32-cell buffer)
0h -> 3Fh (64-cell buffer)
0h -> 7Fh (128-cell buffer).
Reserved
15:7
R/O
Always reads “0000_0000_0”.
Note:
The write pointer value is cleared to “00h” upon start-up and each time that the DRENB bit is cleared (i.e., when the Data RX_SAR is
disabled, the write pointer is automatically cleared to “00h”).
Table 48 - Data RX_SAR Write Pointer Register
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