Cypress FM4 Series - Page 821

CHAPTER 14: External Bus Interface
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 821
[bit11:8]RASEL: Row Address Select
These bits select the address bit on the internal bus output as row address.
bit
Description
0000
MAD[13:0] = Internal address [19:6]
0001
MAD[13:0] = Internal address [20:7]
0010
MAD[13:0] = Internal address [21:8]
0011
MAD[13:0] = Internal address [22:9] [Initial value]
0100
MAD[13:0] = Internal address [23:10]
0101
MAD[13:0] = Internal address [24:11]
0110
MAD[13:0] = Internal address [25:12]
0111 to 1111
Setting is prohibited
[bit7:6]Reserved: Reserved bits
The read value is undefined.
Set this bit to 0 when writing.
[bit5:4]CASEL: Column Address Select
These bits select the address bit on the internal bus output as column address. And, this setting is used
also as the setting of SDRAM bus width.
bit
Description
00
MAD[9:0] = Internal address [10:1]、16-bit width[Initial value]
01
MAD[9:0] = Internal address [11:2]、32-bit width[
10 to 11
Setting is prohibited