Figure 4.17-36 Example Of Timing Chart Of Cbr Refresh Automatic Wait Cycle; Figure 4.17-37 Example Of Selfrefresh Timing Chart - Fujitsu MB91F109 FR30 Hardware Manual

CHAPTER 4 BUS INTERFACE
Automatic Wait Cycle of CBR Refresh

Figure 4.17-36 Example of Timing Chart of CBR Refresh Automatic Wait Cycle

CLK
RAS
CAS
[Explanation of operation]
• When inserting a CBR refresh automatic wait cycle, set the R3W bit of the RFCR.
Selfrefresh
CLK
SLFR bit
RAS
CAS
[Explanation of operation]
• Set the SLFR bit of DMCR4 or DMCR5 to "1" to start selfrefresh and set "0" to release it.
• When the selfrefresh ends, at least seven idle cycles are inserted.
• In this manual, selfrefresh is represented by "SR1 to SR3".
192
R1 R1W R2
wait

Figure 4.17-37 Example of Selfrefresh Timing Chart

SR1 SR2
R3 R3W R4
wait
SR3 SR3 SR3
idle
idle