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HYDRA book errata — Parallax Forums

HYDRA book errata

PVJohnPVJohn Posts: 60
edited 2006-12-09 20:46 in Propeller 1
There's a difference·at page 165 (Onboard EEPROM design) and electronic version of the main schematic on CD. CD version has 1 resistor more (R41) between SCK/P28 and 3.3VCC. What's on the board? Componets are to small for me to check.

PVJohn

Comments

  • AndreLAndreL Posts: 1,004
    edited 2006-12-09 00:54
    In the final version of the board, I decided to put a pulliup on that line to make it more compatible with the spec. Otherwise, the prop has to actively pull the lines high. The I2C spec states both lines should be tied to a weak high under normal circumstances. So the bottom line is the book doesn't have the optional resistor I decided to put in on the final version which did make it into the gif of the schematic. We will probably update this figure on the next printing.

    andre'
    ·
  • GadgetmanGadgetman Posts: 2,436
    edited 2006-12-09 20:23
    There's a couple of other errors in the book, too...

    Page 184.
    13.4 Cog registers.
    As Noted, each cog has a set of (16) 32-bit registers addressed at $000 - $1EF (LONG addresses) which are available from HLL as well as ASM.
    - Shouldn't that be $1F0 - $1FF?

    Page 205, in figure 13:2 the letter
  • AndreLAndreL Posts: 1,004
    edited 2006-12-09 20:46
    Yup, those are typos, and there should be a circle above the "A" to make it an angstrom symbol or whatever. Thanks!

    Andre'

    Post Edited (AndreL) : 12/9/2006 10:06:23 PM GMT
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