Cypress FM4 Series - Page 828

CHAPTER 14: External Bus Interface
828 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
[bit19:16] TRAS: RAS active time
These bits set the minimum active time of ROW.
bit
Description
0000
1 cycle
…
…
0010
3 cycles [Initial Value]
…
…
0111
8 cycles
1000
Setting is prohibited.
…
…
1111
Setting is prohibited.
[bit15:12] TRCD: RAS-CAS Delay
These bits set the latency from RAS to CAS.
bit
Description
0000
1 cycle
0001
2 cycles [Initial Value]
0010
Setting is prohibited.
…
…
1111
Setting is prohibited.
[bit11:8] TRP: RAS Precharge time
These bits set the precharge time.
bit
Description
0000
1 cycle
0001
2 cycles [Initial Value]
…
…
0011
4 cycles
0100
Setting is prohibited.
…
…
1111
Setting is prohibited.
[bit7:4] TRC: RAS Cycle time
These bits set the latency between RASs.
bit
Description
0000
1 cycle
…
…
0100
5 cycles [Initial Value]
…
…
0111
8 cycles
1000
Setting is prohibited.
…
…
1111
Setting is prohibited.