SI3210DCQ1-EVB Silicon Laboratories Inc, SI3210DCQ1-EVB Datasheet - Page 111

• Manufacturer Part Number: SI3210DCQ1-EVB
• Description: DAUGHTERCARD W/SI3201 INTERFACE
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r
• Type: SLIC/CODECr

Specifications of SI3210DCQ1-EVB

• Contents: Evaluation Board and CD-ROM
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Si3210
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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 2’s-complement format.
Note: The values of all indirect registers are undefined following the reset state.
Addr.
Addr. D15
10
12
11
0
1
0
1
2
3
4
5
6
7
8
9
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.
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.
D14
D13
D12
Table 38. DTMF Indirect Registers Description
Table 37. DTMF Indirect Registers Summary
D11
D10
Description
D9
Rev. 1.42
ROWREL[15:0]
PWRMIN[15:0]
COLREL[15:0]
FWDTW[15:0]
REVTW[15:0]
ROW0[15:0]
ROW1[15:0]
ROW2[15:0]
ROW3[15:0]
ROW2[15:0]
HOTL[15:0]
COL2[15:0]
COL[15:0]
D8
D7
D6
D5
Si3210/Si3211
D4
D3
D2
Reference
D1
Page
41
41
D0
111