MPC8533EVTANG Freescale Semiconductor, MPC8533EVTANG Datasheet - Page 384

• Manufacturer Part Number: MPC8533EVTANG
• Description: MPU POWERQUICC 783-PBGA
• Manufacturer: Freescale Semiconductor

Specifications of MPC8533EVTANG

• Processor Type: MPC85xx PowerQUICC III 32-Bit
• Speed: 800MHz
• Voltage: 1V
• Mounting Type: Surface Mount
• Package / Case: 783-FCPBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

DDR Memory Controller
Table 9-48
Note that in the absence of refresh support, system software must preserve DDR SDRAM data (such as by
copying the data to disk) before entering the power-saving mode.
The dynamic power-saving mode uses the CKE DDR SDRAM pin to dynamically power down when there
is no system memory activity. The CKE pin is negated when both of the following conditions are met:
CKE is reasserted when a new access or refresh is scheduled or the dynamic power mode is disabled. This
mode is controlled with DDR_SDRAM_CFG[DYN_PWR_MGMT].
Dynamic power management mode offers tight control of the memory system’s power consumption by
trading power for performance through the use of CKE. Powering up the DDR SDRAM when a new
memory reference is scheduled causes an access latency penalty, depending on whether active or precharge
powerdown is used, along with the settings of TIMING_CFG_0[ACT_PD_EXIT] and
TIMING_CFG_0[PRE_PD_EXIT]. A penalty of 1 cycle is shown in
9-62
•
•
No memory refreshes are scheduled
No memory accesses are scheduled
summarizes the refresh types available in each power-saving mode.
MPC8533E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
Table 9-48. DDR SDRAM Power-Saving Modes Refresh Configuration
COMMAND
Bus Clock
CKE
Figure 9-46. DDR SDRAM Power-Down Mode
Power Saving Mode
24
Sleep
NOP
Refresh Type
None
Self
SREN
—
Figure
1
NOP
9-46.
ACT
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