AVT2 RC1 Reference Board

Language:

English ‪中文(台灣)‬

FEATURES

• 336 MHz XBurst Jz4720 MIPS­compatible CPU
• display: 8­bit RGB / ITU 656/601 data format input of TFT display.
• dimension (mm): 94.5 x 65
• DRAM: 64MB Synchronous DRAM
• headphone jack (3.5 mm)
• SDHC microSD
• support 850mAh charge limited 4.2V Li­ion battery
• 2GB NAND flash memory
• mini­USB: USB 2.0 High­Speed Device
• micro­AB USB: USB 1.1 Host
• serial console
• speaker and microphone
• 58 Keys

4 LAYERS

Qi Hardware Ben NanoNote

Qi Hardware Ben NanoNote

DESCRIPTIONS of BLOCK

SDRAM

This board has finally 64MB SDRAM with one chip U8 Micron MT48LC32M16A2P­75.

NAND FLASH

This board has SAMSUNG 2GB U9 K9GAG08U0M­PCB0.

USB INTERFACE

    There has one USB 1.1 host port with micro­AB receptacle connector(J4), 

one USB 2.0 device port on main board (J2). AUDIO SYSTEM

    JZ4720 provides internal CODEC is an I2S/AC97 audio CODEC with 18 

bits DAC and 16 bits ADC. The audio system of this design makes use of the internal CODEC to implement the input and

output of audio. It consists of MIC­in with two solder pastes MIC+1 and MIC­

1, headphone jack J3, an amplifier U10 GPY0030B for external speaker

connecting to the solder paste SP+1 and SP­1. When plug a headphone in 

J3, the amplifier will be off.

The audio system provides record with gain control; stereo headphone output 

with bass/treble boost, and output volume control by software. KEYBOARD INTERFACE

     There are 58 keys reserved by software control. An another ON/OFF key 

S9 connected to pin 124 WAKEUP_/PD29 of jz4720. A reset key S1 connected to pin 123 PPRST_ of jz4720. When this pin receives Low, the cpu will start a reset procedure. MICRO­SD CARD SOCKET

     J1 is the MICRO­SD card socket for extension memory.

LCD INTERFACE

     CON2 can let you connected with 24pins of FPC to support 8­bit RGB / 

ITU 656/601 data format input of TFT display. CHARGING STATUS LED

     LED D3 indicates the charge status that light when charging.

BOOT SELECT SWITCH

     SW1 can be switched to either USB BOOT mode or NAND FLASH BOOT 

mode. SERIAL CONSOLE

     CON3 is a serial console with 3 terminals in RXD/TXD/GND fuctionality 

which can communicate with jz4720. JTAG TEST POINTs

     There are 5 test points TP1~5 reserved for JTAG interface. 

UART PORT

     There is another uart port reserved which shares pins with JTAG 

interface. TOUCH SCREEN INTERFACE

     XP/XN, YP/YN (TP81/TP84, TP82/TP83) test points reserved inputs for 

touch screen.

PROJECT SITE

  [1]

KNOWN ISSUES

1. Charge function of U5 SE9016 fail due to wrong pcb footprint layout

  on U5 pin PROG and VCC reversely. After rework, it works well.

2. USB host functionality failure by wrong design on choosing parts.

  Instead of USBDF01W5 for EMI Filter and line termination for USB 
  downstream ports. After rework, it works well.

3. BD4 needed to be changed into Sunlord ferrite bead

  PZ1608D221TF and BN1/BN2 needed to be changed into Sunlord 
  ferrite bead array ARZ3216­4­601 to pass FCC test.

4. Not easily plug­in the CON2 fpc connector, after using TONYO's

  BL114­24RL­TAND. It connects well.

5. J1 micro­SD socket is out of placements a little. 6. Keys are out of placement met with mechanical metal domn, but still

  works well.

7. Y1 32.768KHz Xtal is not at right spec, after changing to

  YOKETANT P1AT26070327681220AD. It works well.