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| 型號： | SI3230MPPQX-EVB |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 101/108頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL W/DISCRETE INTERFACE |
| 標準包裝： | 1 |
| 系列： | ProSLIC® |
| 主要目的： | 接口，模擬前端（AFE） |
| 已用 IC / 零件： | Si3230 |
| 已供物品： | 板，CD |
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Si3230
92
Preliminary Rev. 0.96
Not
Recommended
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4. Indirect Registers
Indirect registers are not directly mapped into memory but are accessible through the IDA and IAA registers. A
write to IDA followed by a write to IAA is interpreted as a write request to an indirect register. In this case, the
contents of IDA are written to indirect memory at the location referenced by IAA at the next indirect register update.
A write to IAA without first writing to IDA is interpreted as a read request from an indirect register. In this case, the
value located at IAA is written to IDA at the next indirect register update. Indirect registers are updated at a rate of
16 kHz. For pending indirect register transfers, IAS (direct Register 31) will be one until serviced. In addition an
interrupt, IND (Register 20), can be generated upon completion of the indirect transfer.
4.1. DTMF Decoding
All values are represented in twos-complement format.
Note:
The values of all indirect registers are undefined following the reset state.
Table 31. DTMF Indirect Registers Summary
Addr. D15
D14
D13
D12
D11
D10
D9
D8D7D6D5D4D3D2D1
D0
0
ROW0[15:0]
1
ROW1[15:0]
2
ROW2[15:0]
3
ROW3[15:0]
4
COL[15:0]
5
FWDTW[15:0]
6
REVTW[15:0]
7
ROWREL[15:0]
8COLREL[15:0]
9
ROW2[15:0]
10
COL2[15:0]
11
PWRMIN[15:0]
12
HOTL[15:0]
Table 32. DTMF Indirect Registers Description
Addr.
Description
Reference
Page
0
DTMF Row 0 Peak Magnitude Pass Ratio Threshold.
This register sets the minimum power ratio threshold for row 0 DTMF detection. If the ratio of
power in row 0 to total power in the row band is greater than ROW0, then a row 0 signal is
detected. A value of 0x7FF0 corresponds to a 1.0 ratio.
1
DTMF Row 1 Peak Magnitude Pass Ratio Threshold.
This register sets the minimum power ratio threshold for row 1 DTMF detection. If the ratio of
power in row 1 to total power in the row band is greater than ROW1, then a row 1 signal is
detected. A value of 0x7FF0 corresponds to a 1.0 ratio.
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