|
SH7020 Datasheet, PDF (479/509 Pages) Renesas Technology Corp – SuperH™ RISC engine | |||
|
◁ |
Tp
CK
A21âA0
RAS
CAS
RD(Read)
WRH, WRL,
(Read)
AD15âAD0
DPH, DPL
(Read)
DACK0
DACK1
(Read)
RD(Write)
WRH, WRL,
(Write)
AD15âAD0
(Write)
DPH, DPL
(Write)
DACK0
DACK1
(Write)
WAIT
Tr
Tc1
Tw
Tc2
Row
Column
tRDD
tCAC2*1
tACC2*2
tRAC2*3
tRSD
tWTS tWTH tWTS tWTH
Notes: 1.
2.
3.
For tCAC2, use tcyc à (n + 1) â 25 instead of tcyc à (n + 1) â tCASD2 â tRDS.
For tACC2, use tcyc à (n + 2) â 30 instead of tcyc à (n + 2) â tAD â tRDS.
For tRAC2, use tcyc à (n + 2.5) â 20 instead of tcyc à (n + 2.5) â tRASD1 â tRDS.
Figure 19.15 DRAM Bus Cycle: (Long Pitch, High-Speed Page Mode + Wait State)
RENESAS 469
|
▷ |