PrimeCell® Static Memory Controller (PL350 series) Technical Reference Manual 3.3.16. ECC Configuration Register

3.3.16. ECC Configuration Register

The ecc_memcfg Register is read-write and contains information about the structure of the memory. See Error Correction Code operation for more information about the settings in this register. Figure 3.21 shows the register bit assignments.

Figure 3.21. ecc_memcfg Register bit assignments

Table 3.17 lists the register bit assignments.

Table 3.17. ecc_memcfg Register bit assignments

Bits	Name	Function
[31:13]	-	Reserved, read undefined
[12:11]	ecc_extra_block_size	The size of the extra block in memory after the last 512 block: b00 = 4 bytes b01 = 8 bytes b10 = 16 bytes b11 = 32 bytes. Note These bits are only present if you configure the SMC to use the ECC Extra Block Enable option. See the AMBA Designer (FD001) PrimeCell Static Memory Controller (PL350 series) User Guide Supplement for information about enabling this option.
[10]	ecc_extra_block	If configured, this enables a small block for extra information after the last 512 bytes block in the page. Note These bits are only present if the ECC Extra Block Enable option is configured.
[9]	ecc_int_abort	Interrupt on ECC abort.
[8]	ecc_int_pass	Interrupt when a correct ECC value is read from memory.
[7]	ecc_ignore_add_eight	This bit is used to indicate if A8 is output with the address, required to find the aligned start of blocks: 0 = A8 is output 1 = A8 is not output. See Secondary mode addressing.
[6:5]	ecc_jump	Indicates that the memory supports column change address commands: b00 = no jumping, reads and writes only occur at end of page b01 = jump using column change commands b10 = jump using full command b11 = reserved.
[4]	ecc_read_end	Indicates when ECC values are read from memory: 0 = the ECC value for a block must be read immediately after the block. Data access must stop on a 512 byte boundary. 1 = ECC values for all blocks are read at the end of the page.
[3:2]	ecc_mode	This specifies the mode of the ECC block: b00 = bypassed. b01 = ECC values are calculated and made available on the APB interface. But they are not read to or written from memory. b10 = ECC values and calculated and read/written to memory. For a read, the ECC value is checked and the result of the check is made available on the APB interface. b11 = reserved.
[1:0]	page_size	The number of 512 byte blocks in a page: b00 = No 512 byte blocks. Reserved if an ecc_extra_block is not configured and enabled. b01 = One 512 byte block. b10 = Two 512 byte blocks. b11 = Four 512 byte blocks.

Note

You must not write to this register while the ECC block is busy. You can read the current ECC block status from the ECC Status Register.

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