W925E625 Datasheet, PDF (54/75 Pages) Winbond – 8-bit CID MICROCONTROLLER

W925E/C625
6.16 Calling Identity Delivery (CID)
W925E/C625 provides type I and type II of CID system. Type I is on-hook calling with CID message
and type II is off-hook call on waiting. The CID function includes FSK decoder, dual tone alert signal
detector, ring detector and DTMF receiver. The FSK demodulation function can demodulate Bell 202
and ITU-T V.23 Frequency Shift keying (FSK) with 1200 baud rate. The Tone Alert Signal detect
function can detect dual tones of Bellcore Customer Premises Equipment(CPE) Tone Alerting
Signal(CAS) and BT Idle State and Loop State Tone Alert Signal. The line reversal for BT, ring burst
for CCA or ring signal for Bellcore can be detected by ring detector. It is compatible with Bellcore TR-
NWT-000030 & ST-TSV-002476, British Telecom(BT) SIN227, U.K. Cable Communications
Association(CCA) specification. The DTMF receiver can be programmed as DTMF decoder to decode
16 DTMF signals or tone detector to detect the signal which frequency is in DTMF band. The tone
detector can be an auxiliary detector to improve the performance of detecting tone alerting
signal(CAS), said as talk down-off, in type II system.
The FSK decoder, alert tone detector and DTMF receiver can be enable/disable individually by the bits
of FSKE, CASE and DTMFE in FSK DATA REGISTER(FSKDR). CIDE is the global control bit to
enable/disable FSK decoder, alert tone detector and DTMF receiver. However, the ring detector is
always active.
CIDGD CIDGA
DTMFE
INP2
INN2
GCFB2
INP1
INN1
GCFB1
VREF
CAP
CIDE,RST
VADD
VASS
Input Pre-processor
+
PGAF _Anti-alias
<3:0>
Filter
-
PGD
<7:4>
PGD
<3:0>
High Tone
Bandpass
Filter
High Tone
Detector
Low Tone
Bandpass
Filter
PHAD<3:0>
Low Tone
Detector
ESt
Guard
Time
Timer
Decode
data
and Latch
DTMFD
DD3-DD0
Input Pre-processor
+
PGAF _Anti-alias
<7:4>
Filter
-
FSKE
FSK Demodulation Circuit
FSK Bandpass
Filter
FSK
Demodulator
PHFL<7:4>
FSK Carrier
Detector
DATE
PHFL<3:0>
FSK
Data Output
Interface
DTMFPT/DTMFAT
FDATA
FD7-FD0
FDR
FCD
To internal
circuit
Bias Voltage
Generator
Clock Driver
High Tone
Dual Tone Alert Signal Detection Circuit
Bandpass
Filter
High Tone
Detector
Guard
Time
PHAD<7:4>
Circuit
Low Tone
Bandpass
Filter
Low Tone
Detector
To internal
circuit
Ring Detector
Interrupt
Generator
ALGO
CASPT/CASAT
RNG
Fm
RNGDI RNGRC
PS: The signals noted in italic and underline type are CID pins on the chip.
Figure 6-17 The CID Block Diagram
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