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Flexible static memory controller (FSMC) RM0351

348/1693 DocID024597 Rev 3

14.4.2 NAND Flash memory address mapping

The NAND bank is divided into memory areas as indicated in Table 48.

For NAND Flash memory, the common and attribute memory spaces are subdivided into

three sections (see in Table 49 below) located in the lower 256 Kbytes:

• Data section (first 64 Kbytes in the common/attribute memory space)

• Command section (second 64 Kbytes in the common / attribute memory space)

• Address section (next 128 Kbytes in the common / attribute memory space)

The application software uses the 3 sections to access the NAND Flash memory:

• To sending a command to NAND Flash memory, the software must write the

command value to any memory location in the command section.

• To specify the NAND Flash address that must be read or written, the software

must write the address value to any memory location in the address section. Since an

address can be 4 or 5 bytes long (depending on the actual memory size), several

consecutive write operations to the address section are required to specify the full

address.

• To read or write data, the software reads or writes the data from/to any memory

location in the data section.

Since the NAND Flash memory automatically increments addresses, there is no need to

increment the address of the data section to access consecutive memory locations.

1. In case of a 16-bit external memory width, the FMC will internally use HADDR[25:1] to generate the

address for external memory FMC_A[24:0].

Whatever the external memory width, FMC_A[0] should be connected to external memory address A[0].

Table 48. NAND memory mapping and timing registers

Start address End address FMC bank Memory space Timing register

0x8800 0000 0x8BFF FFFF

Bank 3 - NAND Flash

Attribute FMC_PATT (0x8C)

0x8000 0000 0x83FF FFFF Common FMC_PMEM (0x88)

Table 49. NAND bank selection

Section name HADDR[17:16] Address range

Address section 1X 0x020000-0x03FFFF

Command section 01 0x010000-0x01FFFF

Data section 00 0x000000-0x0FFFF

ST STM32L4x6 User Manual

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