EMIF
12. Power Management Control Shadow register (PMCSR)
13. Interface Configuration register (INT_CONFIG)
14. System OCP Interrupt Enable Set Register (SOIESR)
15. DDR PHY Control 1 register (DDRPHYCR)
16. DDR PHY Control 1 Shadow register (DDRPHYCSR)
•
Memory controller completes all pending transactions and drains all its FIFOs.
•
Memory controller puts the SDRAM in Self Refresh.
•
Memory controller copies all shadow memory mapped registers to its main registers. It is assumed that
the shadow register always has the same value as its corresponding main register.
•
Memory controller waits for all interrupts to be serviced.
•
Memory controller acknowledges assertion of internal power down request.
•
The internal module reset signal is asserted.
•
The clocks and power to the memory controller can now be switched off.
To restore power to the memory controller, the following sequence of operations is followed:
•
The power and clocks to the Memory controller are switched on.
•
The internal module reset signal is deasserted, indicating to the Memory controller that it is waking up
from off mode.
•
The memory controller does not perform SDRAM initialization and forces its state machine to be in
self-refresh.
•
The external master restores all of the above memory mapped registers.
•
The external master restores all of the above memory mapped registers.
•
The system can now perform access to the external memory.
7.3.3.11.6 EMIF PHY Clock Gating
The clock to the DDR2/3/mDDR PHY can be gated off to achieve power saving. For more information, see
the EMIF0/1 Clock Gate Control register (EMIF_CLK_GATE).
7.3.4 Use Cases
For details on connecting this device to mDDR/DDR2/DDR3 devices, see the device-specific data sheet,
which will include specific instructions and routing guidelines for interfacing to mDDR (LPDDR), DDR2,
and DDR3 devices.
7.3.5 EMIF4D Registers
lists the memory-mapped registers for the EMIF4D. All register offset addresses not listed in
should be considered as reserved locations and the register contents should not be modified.
Table 7-110. EMIF4D REGISTERS
Offset
Acronym
Register Name
Section
0h
EMIF_MOD_ID_REV
4h
STATUS
8h
SDRAM_CONFIG
Ch
SDRAM_CONFIG_2
10h
SDRAM_REF_CTRL
14h
SDRAM_REF_CTRL_SHDW
18h
SDRAM_TIM_1
1Ch
SDRAM_TIM_1_SHDW
20h
SDRAM_TIM_2
24h
SDRAM_TIM_2_SHDW
422 Memory Subsystem
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated