Former Uart2; Former Pcm Audio Digital Codec Interface - Wavecom GR64 Migration Giude

For the new variant GR64, the VREF pin is configured as an input. In this arrangement
he user provides a reference voltage from their own application, which is used by the
host-side level shifter interfaces.
Change Impact: No impact to existing users for the legacy variant.
3.2.8

Former UART2

Pin
45
46
One of the three UARTs in the GR4x series has been replaced by a reserved interface
in the GR64. The absence of a third hardware UART encouraged this change.
Change Impact: For users of the third UART in GR4x products, some re-configuration
of serial interfaces may be necessary.
Embedded Application for configuring GPIO like an SPI bus offers a viable serial
interface.
3.2.9

Former PCM Audio Digital CODEC Interface

Pin
47
A PCM interface between the GR4x series audio CODEC and the DSP gave users the
option of installing a DSP device to improve audio acoustic performance. The GR64
voice-band architecture is more advanced and far better performing than its
predecessor.
removes the need for this former interface.
Migration Guide
GR4x to GR64
Page 19 of 28
GR64 GR4x Functional Difference
Reserved TD2
UART2 replaced by reserved interface
Reserved RD2
GR64 GR4x Functional Difference
VUSB PCMULD PCM CODEC interface does not exist
This factor, together with the GR64 memory-mapped digital audio
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 Migration Guide
Different alternatives are available; an