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Geometry.md

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Summary

This section describes the format of geometry parameter.
The general parameter template is pages:addressing:main_size:spare_size and fields are described in next section.

Fields

pages

Total number of pages, this should include:

  • all pages defined by manufacturer
  • all gaps between pages (non existing pages in continous range of pages)
  • addressing gaps, when lower bits of addressing bytes are zero by specification

Applying the last hint will result longer read times and unnecessary data in the output file, but it will lead to reading all the data.

addressing

This field specify how address bytes will generated for page selection and how pages will be read. There are six supported adressing modes "SPsimple3B", "SPsimple4B", "SPsimple5B", "LPsimple3B", "LPsimple4B", "LPsimple5B". All generates the number of bytes they mention in the name, filling them from LSB to MSB.

SPxxx modes

This is legacy small page addressing mode, it reads:

  • main part of page, by commands Read0 (0x00) and Read1 (0x01) (to read both halves of the single page)
  • spare part of page, by command Read2 (0x50)

LPxxx modes

This is legacy large page addressing mode, it reads:

  • main part of page, by commands Read0 (0x00) and ReadStart (0x30) with byte offset set to 0
  • spare part of page, by command Read0 (0x00) and ReadStart (0x30) with byte offset set to size of main data

In this addressing mode, the first 16 bits of address (two first bytes) will be used as the byte address within the page and the higher bits will be used as the page number.

main_size

The size of the main data in page, expressed in bytes. Usually high powers of 2, such as 512/1024/2048/4096/8192

spare_size

The size of the spare data in page, expressed in bytes. Usually small powers of 2, such as 16/32/64/128

Examples

Here will be some examples.