Features And Specifications - Renesas CPU Board M3A-HS19 User Manual

2
Figure 2.3.4 shows a timing example of SDRAM mode register writing.
Tp
CKIO
SDRAM
PALL
Command
A11-A1(A9-A0)
A12(A10/AP)
CS3#
RASL#
CASL#
RD/WR#
DQMUU-LL
D15-0
[Symbols Descriptions]
PALL : All bank precharge command
REF : Auto-refreshing command
MRS : Mode register write commamd
DESL : Deselect command
Rev.1.01 Oct 28, .2008
REJ10J1351-0101
tRP
Tpw Trr Trc Trc
DESL
DESL REF DESL DESL
(High)
Hi-Z
Figure 2.3.4 Timing Example of SDRAM Mode Register Writing
tRC
Trc Trc Trr
Trc
REF command is issued 8 times
DESL DESL REF

Features and Specifications

2.3.3 External Synchronous DRAM
Tmw
Trr Trc Tnop
REF
DESL MRS DESL
2-8