ml7074-001ga Oki Semiconductor, ml7074-001ga Datasheet - Page 22

• Manufacturer Part Number: ml7074-001ga
• Description: Speech Codec
• Manufacturer: Oki Semiconductor

These are ground pins. GDND0, 1, 2 are the ground pins for the digital circuits and AGND is the ground pin for
These are input pins for testing purposes only. Keep the inputs to these pins at the “0” level during normal use conditions.
This is the interrupt request output pin. An “L” level is output for a duration of about 1.0 µsec at this pin when
This output will be maintained at the “H” level when there is no change in state of any of the interrupt causes.
• Underflow error (CR3-B0)
• Overrun error (CR3-B1)
• When a dial pulse is detected (CR4-B6).
• When a DTMF signal is detected (CR4-B4).
• When DTMF_CODEC0, 1, 2, 3 are detected (CR4-B0, B1, B2, B3).
• When TONE0 is detected (CR3-B3).
• When TONE1 is detected (CR3-B4).
• When FGEN_RQ is generated (CR3-B6).
• When DSP_ERR is detected (CR3-B7).
DGND0, DGND1, DGND2, AGND
the analog circuits of the ML7074. Connect these pins to ground near the ML7074.
TST0, TST1, TST2, TST3
INTB
there is a change in state of an interrupt cause.
The actual interrupt cause generating the interrupt can be verified by reading CR3 and CR4. The different
interrupt causes are described below.
Oki Semiconductor
An interrupt is generated when a 2100 Hz tone signal is detected.
An interrupt is generated when there is a change to the non-detection condition in the tone signal detection
condition.
An interrupt is generated when the FSK generator makes a request for the next data to be transmitted.
An interrupt is generated when there is a change from the condition in which the FSK generator is requesting for
An interrupt is generated when any error occurs in the DSP inside the ML7074.
An interrupt is generated when an internal read from the receive buffer occurs before the write into the receive
buffer from the ML7074 has been completed.
An interrupt is generated when a normal write is made into the receive buffer by the ML7074 and the
underflow error is released.
An interrupt is generated when an internal write of the next data into the transmit buffer occurs before the
transmit buffer data read out from the ML7074 has been completed.
An interrupt is generated when a normal read out is made from the transmit buffer by the ML7074 and the
overrun error is released.
An interrupt is generated when a DTMF signal is detected.
An interrupt is generated when there is a change from the DTMF signal detected state to the not-detected state.
An interrupt is generated when there is a change in the detected code (CR4-B0, B1, B2, B3) in the condition in
which a DTMF signal is being detected.
An interrupt is generated when a 1650 Hz tone signal is detected.
An interrupt is generated when there is a change to the non-detection condition in the tone signal detection
condition.
transmission data to the condition in which there is no request for internal fetch of the data to be transmitted next.
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