CHAPTER 5 MEMORY ACCESS CONTROL FUNCTION
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User’s Manual U14359EJ4V0UM
(2) Auto-refresh cycle
In the auto-refresh cycle, the auto-refresh command (REF) is issued four clocks after the precharge
command for all banks (PALL) is issued.
Figure 5-17. Auto-Refresh Cycle
TREFW
PALL
REF
TABPW
TREFW TREFW
TREF
H
H
Address
Auto-refresh cycle
SDCLK (output)
BCYST (output)
SDCKE (output)
H
H
Command
SDRAS (output)
SDCAS (output)
CSn (output)
WE (output)
LDQM (output)
UDQM (output)
Address (output)
A10 (output)
D0 to D15 (I/O)
Remarks 1.
The broken lines indicate the high-impedance state.
2.
n = 1, 3, 4, 6