M58LT256JST datasheet(71/106 Pages) STMICROELECTRONICS

71 / 106 page

M58LT256JST, M58LT256JSB

Block address tables

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Appendix A

Block address tables

The following set of equations can be used to calculate a complete set of block addresses

using the information contained in Tables 29 to 34.

To calculate the Block Base Address from the Block Number:

First it is necessary to calculate the Bank Number and the Block Number Offset. This can be

achieved using the following formulas:

Bank_Number = (Block_Number

− 3) / 16

Block_Number_Offset = Block_Number

− 3 − (Bank_Number x 16)

If Bank_Number = 0, the Block Base Address can be directly read from Tables 29 and 32

(Parameter Bank Block Addresses) in the Block Number Offset row. Otherwise:

Block_Base_Address = Bank_Base_Address + Block_Base_Address_Offset

To calculate the Bank Number and the Block Number from the Block Base Address:

If the address is in the range of the Parameter Bank, the Bank Number is 0 and the Block

Number can be directly read from Tables 29 and 32 (Parameter Bank Block Addresses), in

the row that corresponds to the address given. Otherwise, the Block Number can be

calculated using the formulas below:

For the top configuration (M58LT256JST):

Block_Number = ((NOT address) / 216) + 3

For the bottom configuration (M58LT256JSB):

Block_Number = (address / 216) + 3

For both configurations the Bank Number and the Block Number Offset can be calculated

using the following formulas:

Bank_Number = (Block_Number

− 3) / 16

Block_Number_Offset = Block_Number

− 3 − (Bank_Number x 16)

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