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On-Card Memory:
Double Data Rate SDRAM
10006609-03
Pm8560
User’s Manual
4-3
DOUBLE DATA RATE SDRAM
The Pm8560 supports up to 512 megabytes of DDR SDRAM for data storage. On-card
SDRAM occupies physical addresses starting at 0000,0000
16
. The double data rate archi-
tecture is designed to enhance performance especially in high-speed operation. The DDR
SDRAM interface operates at 133 MHz when the processor core is at 800 MHz.
The SDRAM is controlled by the MPC8560 SDRAM controller, see
Fig. 4-1
. The controller
may be programmed for most memory sizes through software initialization of the on-chip
configuration registers. Software determines the board’s capacity by reading the Hardware
Configuration register 1, see page 8-4. The DDR memory controller supports Error-correct-
ing Code (ECC) by detecting and correcting all single-bit errors, and detects all double-bit
errors and all errors within a nibble.
Figure 4-1:
MPC8560 To SDRAM Connection
DDR SDRAM Programming
After power-up, the DDR SDRAM must be initialized by issuing a Mode register set com-
mand to establish its mode of operation. During that command execution, data is read by
the Mode register from the SDRAM’s address bus. This command is fully supported by the
MPC8560 DDR SDRAM machine.
Table 4-2:
DDR SDRAM Mode Register Definition
Address Bus (bits):
Mode Field:
Value:
Description:
BA1-BA0 (14:13)
Base Mode
‘0,0’
Selects Base Mode register
DDR SDRAM
(2 banks)
MPC8560
DDR
Controller
MWE*
MRAS*
MCAS*
MCS[0:1]*
MA[0:14]
MBA[0:1]
MDQS[0:8]
MDQ[0:63]
MCLK[0:4]*
MSYNC_OUT
WE*
RAS*
CAS*
CS[0:1]*
A[13:0]
BA[1:0]
DQS[0:8]
Clocks
CLK[4:0]*
DM[8:0]*
MCKE[0:1]
CKE[1:0]
MDM[0:8]*
DDR SDRAM Control
DDR SDRAM Address Control
Data Qualifiers
DQ[0:63]
Data Signals
MCLK[0:4]
CLK[4:0]
MSYNC_IN
MECC[0:7]
ECC[0:7]
Summary of Contents for Pm8560
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Page 36: ...Setup Troubleshooting Pm8560 User s Manual 10006609 03 2 12 ...
Page 54: ...Serial I O Baud Rate Selection Pm8560 User s Manual 10006609 03 5 4 ...
Page 62: ...TDM Interface Rear Panel I O Connector P14 Pm8560 User s Manual 10006609 03 6 8 ...
Page 72: ...PCI Bus Interface PMC Connector Pin Assignments Pm8560 User s Manual 10006609 03 7 10 ...
Page 112: ...Development Mezzanine Card Troubleshooting Pm8560 User s Manual 10006609 03 10 12 ...
Page 138: ...Monitor Download Formats Pm8560 User s Manual 10006609 03 11 26 ...
Page 144: ...Index continued Pm8560 User s Manual 10006609 03 i 4 ...