Difference between revisions of "TvNow"

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Line 11: Line 11:
 
     Alternative booting on POR
 
     Alternative booting on POR
 
     16K SRAM
 
     16K SRAM
 
 
     JTAG pins:
 
     JTAG pins:
 
 
         * TDO - 4mA drive
 
         * TDO - 4mA drive
 
         * TDI - internal pull up with 50K, schmitt trigger
 
         * TDI - internal pull up with 50K, schmitt trigger
Line 51: Line 49:
  
 
discusion: http://forums.parallax.com/forums/default.aspx?f=15&m=158549
 
discusion: http://forums.parallax.com/forums/default.aspx?f=15&m=158549
 +
 
vendor: http://www.hasbro.com/tiger/default.cfm?page=browse&product_id=18617
 
vendor: http://www.hasbro.com/tiger/default.cfm?page=browse&product_id=18617
  
 
[[Image:tvnow-internal.jpg]]
 
[[Image:tvnow-internal.jpg]]

Revision as of 17:49, 31 May 2007

Tvnow-external.jpg

U1 Sharp LH79524-NOE A0.

   208 BGA Package
   Datasheet. Userguide. Sharp's site.
   A0. Rev. Non ROHS 76.2MHz
   VDDC = 1.8V
   VDD = 3.3V
   USB 1.1 High speed device support with OHCI/UHCI interface
   Glueless NAND interface
   Alternative booting on POR
   16K SRAM
   JTAG pins:
       * TDO - 4mA drive
       * TDI - internal pull up with 50K, schmitt trigger
       * TMS - internal pull up with 50K, schmitt trigger
       * TCLK - internal pull up with 50K, schmitt tigger 

U2 Conexant CX25836-3A

   Located below a shield. TQFP-64
   Single chip video decoder. Datasheet and product brief.
   IO are LVTTL. IOL=4mA drive.

U4 Unknown COB package U5 Green unmarked 0805 package

   Located on USB board 

U6 Green unmarked 0805 package

   Located on USB board 

U7 Unknown COB package U8 TI LM324 U9 Hynix HY57V643220DT-6

   Long, leaded TSOP II 86 pin package
   SDRAM, VDD=3.3 & VDDQ=3.3V, 64Mbit, x32, 4banks, LVTTL
   Decoded per 2004SFC-DRAM.pdf. 6ns (166MHz), 2Mx32 

U11 Hynix HY27UA081G1M

   Wide, leaded package
   NAND flash, 1Gb 

U12 U14 Unknown COB package

Boards The entire system is composed of 4 boards. Most electrolytics are through hole. However, there are a few scattered tantalums.

   * There is a main board with the CPU, memory, and flash, and a SD socket. There is a cylinder shaped crystal (probally 32KHz, watch xtal) and a 28.6363Mhz xtal.
   * There is a board that has the AV inputs on one side.
   * On the otherside, there is a board with a mini USB connector.
   * A 4th board sits on top of 2 sets of fine (0.05 or finer) headers. 


discusion: http://forums.parallax.com/forums/default.aspx?f=15&m=158549

vendor: http://www.hasbro.com/tiger/default.cfm?page=browse&product_id=18617

Tvnow-internal.jpg