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(2) Operation after releasing reset
The data bus width at starting is determined depending on state of AM1/AM0 pins after
releasing reset. Then, the external memory access as follows;
AM1
Note: A memory to be used to start after releasing reset is either NOR-Flash or Masked-ROM.NAND-Flash,
SDRAM can't be used.
AM1/AM0 pins are valid only just after releasing reset. In other cases, the data bus width
is the value set in the control register <BnBUS 1:0>.
After reset, only control register (B2CSH/B2CSL) of the block address area 2 is effective
automatically. (B2CSH<B2E> is set to "1" by reset).
The data bus width which is specified by AM1/AM0 pin is loaded to the bit to specify the
bus width of the control register in the block address area 2.
The block address area 2 is set to address 000000H to FFFFFFH by reset
(B2CSH<B2M> is reset to "0") .
After releasing reset, the block address areas are specified by MSARn and MAMRn.
Then, set BnCS.
Set BnCSH<BnE> to "1" in order to enable the setting.
AM0
0
0
0
1
Start with 16-bit data bus
1
0
1
1
Start with BOOT(32-bit internal-MROM )
92CZ26A-184
Start Mode
Don't use this setting
(note)
Don't use this setting
TMP92CZ26A
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