Chapter 6. MPC8240 Memory Interface
6-67
FPM or EDO DRAM Interface Operation
Figure 6-44. DRAM Bank Staggered CBR Refresh Timing Configuration
6.3.11 FPM or EDO DRAM Power Saving Modes
The MPC8240’s memory interface provides for sleep, doze, and nap power saving modes
defined for the processor core. In doze and nap modes, the MPC8240 supplies normal CBR
refresh to DRAM. In sleep mode, the MPC8240 can be configured to take advantage of
DRAM self-refresh mode, to provide normal refresh to DRAM, or to provide no refresh
support. If the MPC8240 is configured to provide no refresh support in sleep mode, system
software must appropriately preserve DRAM data, that is by copying to disk.
See Chapter 14, “Power Management,” for more information on the power saving modes
of the MPC8240.
6.3.11.1 Configuration Parameters for DRAM Power Saving Modes
Table 6-25 provides a summary of the MPC8240 configuration bits relevant to power
saving modes. In Table 6-25, PMCR1 refers to the MPC8240’s power management
configuration register 1, and MCCR1 refers to memory control configuration register 1.
MCLK
RAS[0,7]
RAS[1,6]
RAS[2,5]
RAS[3,4]
CAS[0:7]
CSR
RPC
WE
INTERNAL
HI-Z
RP1
RAS6P
RAS6P
RC
RAS6P
RAS6P
CHR
WRH
WRP
DATA BUS
NOTES:
1. Subscripts identify programmable timing variable (RP1,
RAS6P).
2. RAS6P = 1–8 cycles.
3. RPs = As configured for read or write timing.
Summary of Contents for MPC8240
Page 1: ...MPC8240UM D Rev 1 1 2001 MPC8240 Integrated Processor User s Manual ...
Page 38: ...xviii MPC8240 Integrated Processor User s Manual TABLES Table Number Title Page Number ...
Page 48: ...xlviii MPC8240 Integrated Processor User s Manual Acronyms and Abbreviations ...
Page 312: ...6 94 MPC8240 Integrated Processor User s Manual ROM Flash Interface Operation ...
Page 348: ...7 36 MPC8240 Integrated Processor User s Manual PCI Host and Agent Modes ...
Page 372: ...8 24 MPC8240 Integrated Processor User s Manual DMA Register Descriptions ...
Page 394: ...9 22 MPC8240 Integrated Processor User s Manual I2O Interface ...
Page 412: ...10 18 MPC8240 Integrated Processor User s Manual Programming Guidelines ...
Page 454: ...12 14 MPC8240 Integrated Processor User s Manual Internal Arbitration ...
Page 466: ...13 12 MPC8240 Integrated Processor User s Manual Exception Latencies ...
Page 516: ...16 14 Watchpoint Trigger Applications ...
Page 538: ...B 16 MPC8240 Integrated Processor User s Manual Setting the Endian Mode of Operation ...
Page 546: ...C 8 MPC8240 Integrated Processor User s Manual ...
Page 640: ...INDEX Index 16 MPC8240 Integrated Processor User s Manual ...