GR4x to GR64 Migration Guide
3.2.10
ALARM
Pin
GR64
GR4x
Functional Difference
48 ALARM
PCMDLD
PCM
CODEC
interface does not exist
The former PCMDLD pin is utilized as an RTC alarm output. This feature is new to
GR64. It provides a feature for users to be able to set an alarm based on a RTC
setting. If an RTC backup source is attached to VRTC, this function will allow the
Wireless CPU® to wake a host application even though the Wireless CPU® itself is
completely powered down.
Change Impact: For users who had DSP devices hooked to this interface, the removal
of this circuitry will reduce cost in their product. The audio performance of GR64
overcomes the shortcomings of the predecessor products. Removal of the need for a
PCM CODEC interface is considered to be an enhancement. The addition of a RTC
Alarm is also viewed as an enhancement.
3.2.11
SERVICE signal
Pin
GR64
GR4x
Functional Difference
58
SERVICE
SERVICE Different voltage, different behavior
The traditional role of the Service function in GR4x-generation devices was that of a
flashing (programming) accelerator, where voltages as great as 12V were applied to
the interface. The memory technology used in GR64 does not require a higher
voltage than the standard digital interface level (2.8V) and will suffer damage if
excessive voltage is applied. To overcome the risk of damage to the Wireless CPU®,
over-voltage protection on the service pin has been implemented.
The Service interface for GR64 is implemented as a simple logic input and should be
exercised in accordance with the signal levels defined in the GR64 Integrators Manual.
Change Impact: Changes in the flash memory programming procedure have no
detrimental impact on existing product users. The only impact is that users will have
to adopt a new procedure, which is designed to make the programming process
easier.
Migration Guide
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable
GR4x to GR64
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