Related links

This page describes the printed circuit board of the phone. Related information can be found on the generic GXP page and on the GPIO page.

Occurrence of this PCB

The GXP1200 PCB is used in the following device models:

• GXP 1200

This manufacturer also produces other models.

Components found

• DSP system-on-chip: This is a TMS320VC5501PGF.
• A coprocessor 320AIC20K from Texas Instruments interfaces speaker, microphone and line in/out to the DSP over I2C or S2C. It includes support for oversampling and filtering.
• Flash memory: 1024k x 16, or 2048k x 8: EN29LV160BB-70TIP. Its 70 nS cycle time makes this flash memory suitable to run programs from, so a smaller RAM size is possible.
• SDRAM: 2048k x 16, or 4096k x 8: 2x W9816G6IH-6. Supports speeds up to 166 Mhz.
• Ethernet: KSZ8842MQL network chip with builtin switch and support for 2 external network connections.. This chip is prepared for IPv6 (includes support for MLD), supports 100 Mb/s networks and includes a switch with 2 external connections.

Connectors found

These are described centrally in more detail:

• J401 is a JTAG connector TODO:VERIFY which is described centrally
• J402 is an I2C connector TODO:VERIFY which is described centrally

The JTAG connector used in these Grandstream phones is a 14-pin connector. Its solder islands are open on the PCB, so soldering in a 0.1" pitched two-row pin header is easy.