CHAPTER 5 MEMORY ACCESS CONTROL FUNCTION
User’s Manual U12688EJ4V0UM00
152
Figure 5-10. DRAM Access Timing During DMA Flyby Transfer (2/2)
(b) In the case of external I/O
→
→
→
→
DRAM
T1
T2
Column address
Row
address
Data
WAIT
D0 to D15
IOWR
IORD
LWR/LCAS
UWR/UCAS
WE
OE
RD
CSn/RASn
BCYST
A0 to A23
CLKOUT
Column address
TCPW
Note
TO1
TO2
TCPW
TO1
TO2
T3
DMAAKm
Column address
Data
Data
Note A minimum of 1 clock cycle is inserted for the TCPW cycle regardless of the CPC0m and CPC1m bit
settings in the DRCm register.
Remarks 1. This is the timing in the case where the number of waits according to the CPC
××
bit (TCPW) is 1
(
××
= 00 to 03, 10 to 13).
2. In the case of external I/O
→
DRAM, the FDW register setting is invalid.
3. The circle indicates the sampling timing.
4. The broken lines indicate high impedance.
5. n = 0 to 7
m = 0 to 3
Содержание V850E/MS1 UPD703100
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