13-27
MB86R02 ‘Jade-D’ Hardware Manual V1.64
13.7 Operation
This section describes DDR2C operation.
13.7.1 DRAM Initialization Sequence
Initialization sequence at using DDR2SDRAM is described below.
Figure 13-2 shows initialization sequence at using DDR2SDRAM in time chart.
To proceed memory access to DDR2SDRAM, initialization sequence should be performed after
power-on.
During initialization sequence, DDRIF macro setting, DLL reset release in DDRIF macro, SDRAM
initialization, OCD adjustment, ODT setting, and others are processed. Refer to "13.7.2
DRAM Initialization Procedure" for more detail of initialization sequence.
Figure 13-2 DDR2SDRAM initialization time chart
IRESET*5
(DDRIF Macro RESET)
XRST
(CHIP RESET)
IUSRRST*5
(DDRIF Macro RESET)
IDLLRST*5
(DDRIF Macro DLL RESET)
MCKE
(DDR2 IF CKE)
*1 PLL lock up time or more
*2 MCKP cycle (166MHz=6[ns])
×
20cycle = 120[ns]
MCKP
(DDR2 IF CLK)
MCS
(DDR2 IF XCS)
*3 DLL lock up time or more (79[us])
*4 Based on DDR2SDRAM spec
ODTCONT
(DDR2 IF ODT)
*5 This is internal signal of CHIP, not pin signal (DDRIFmacro module input signal)
Power-on
(1) *1
(6) IDLLRST release
(4) IRESET/IUSRRST release
(2) DDRIF macro register
(3) 120[ns] or more*2
(5) 120[ns] or more*2
(7)79[us] or more *3
(8)200[us] or more *4
(9) MCKE on
(10) SDRAM
initialization
(12) ODTCONT-on
Shifting to DDR2C
normal operation mode
(11) OCD adjustment,
ODT setting (CHIP
side)
Summary of Contents for MB86R02
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