PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 130

• Manufacturer Part Number: PSB7238
• Description: Joint Audio Decoder-Encoder - Multimode
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Semiconductor Group
The following steps are executed:
1. The host initializes the control registers 60
2. The host generates an interrupt to the JADE by writing value 12
3. The JADE resets the INHB bit and acknowledges the reception by generating an
4. The host may reset the INDB as a reaction to the JADE interrupt. This step is not
5. The JADE restarts its internal firmware beginning with the initialization phase.
For the restart of the internal firmware the JADE needs the same initialization time like
after a hardware reset. So, the user should wait for 10 ms before it accesses the JADE
again.
6.1.3
In case the JADE is not currently needed in the system, the device can be powered
down. Two options exists, one power-down including the PLL and one excluding it.
These options are selected via the contents of the control register 60
leaves the PLL powered-up while the rest of the JADE goes power-down and a zero
value in register 60
complete power-down of the chip.
The power-up is triggered by one of the following interrupts: GPIO, Host interrupt and C/I
channel interrupt.
The sequence to power-down the device is as follows:
1. The host initializes the control registers 60
2. The host generates an interrupt to the JADE by writing value 37
3. The JADE resets the INHB bit. There is no further acknowledge to this interrupt since
4. The host may reset the INDB as a reaction to the JADE interrupt. This step is not
5. The JADE firmware disables the CLKO pin, the PLL as selected and the DSP and can
status register at address 50
interrupt at INT line to the host by writing a value 13
at address 58
mandatory and may be skipped.
(PLL included or excluded, see above).
status register at address 50
the JADE will go to power-down almost immediately.
mandatory and may be skipped.
be woken up by any of the above mentioned interrupts. If the PLL was powered down,
it takes longer to resume normal operation. If the PLL remained powered up, the
firmware is immediately ready for resuming operation.
Power Down Command
H
.
H
includes the PLL in the power-down sequence and therefore is a
H
H
.
.
130
H
H
and 61
by writing a ‘0’ or a non-zero value into it
H
H
by writing a ‘0’ into it.
into IND interrupt status register
Data Sheet 1998-07-01
Firmware Features
H
H
H
. A non-zero value
into INH interrupt
into INH interrupt
PSB 7238