cx20493-35/app Conexant Systems, Inc., cx20493-35/app Datasheet - Page 31

• Manufacturer Part Number: cx20493-35/app
• Description: With Cx20493 Smartdaa?
• Manufacturer: Conexant Systems, Inc.

2.15
2.15.1
2.15.2
102247B
CX81801-7x/8x SmartV.XX Modem in 128-Pin LQFP with CX20493 in 32-Pin LQFP Data Sheet
Diagnostics
Commanded Tests
Power On Reset Tests
•
These country profiles may be altered or customized by modifying the country-dependent
parameters. Additional profiles may also be included. There are two ways to add or
modify profiles:
•
•
Please contact an FAE at the local Conexant sales office if a country code customization
is required.
Diagnostics are performed in response to test commands.
Analog Loopback (&T1 Command). Data from the local DTE is sent to the modem,
which loops the data back to the local DTE.
DMTF Generation (%TT0 Command). Continuous DTMF tones are generated by the
DSP and output through the DAA.
Tone Generation (%TT3 Command). Continuous tones are generated by the DSP and
output through the DAA.
Upon power on, the modem performs tests of the modem and internal RAM. If the
modem or internal RAM test fails, the TMIND# output is pulsed as follows (Figure 2-1):
•
•
Blacklist parameters. The modem can operate in accordance with requirements of
individual countries to prevent misuse of the network by limiting repeated calls to
the same number when previous call attempts have failed. Call failure can be
detected for reasons such as no dial tone, number busy, no answer, no ringback
detected, voice (rather than modem) detected, and key abort (dial attempt aborted by
user). Actions resulting from such failures can include specification of minimum
inter-call delay, extended delay between calls, and maximum numbers of retries
before the number is permanently forbidden ("blacklisted").
Incorporating additional or modified profiles into external flash ROM containing the
entire modem firmware code.
Linking additional or modified profiles from an external serial EEPROM (needed
only if the external flash ROM capacity is exceeded.
Internal RAM test fails: One pulse cycle (pulse cycle = 0.5 sec. on, 0.5 sec. off)
every 1.5 seconds.
Modem device test fails: Three pulse cycles every 1.5 seconds.
Conexant
2-11