MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 367

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The address and command interface is also source synchronous, although 1/8 cycle adjustments are
provided for adjusting the clock alignment.
Figure 9-34
Figure 9-35
Figure 9-36
nine 8M × 8 DDR modules for a total of 256 Mbytes of system memory. One of the nine modules is used
for the memory’s ECC checking function. Certain address and control lines may require buffering.
Analysis of the device’s AC timing specifications, desired memory operating frequency, capacitive loads,
and board routing loads can assist the system designer in deciding signal buffering requirements. The DDR
memory controller drives 16 address pins, but in this example the DDR SDRAM devices use only 12 bits.
Freescale Semiconductor
shows an example DDR SDRAM configuration with four logical banks.
shows some typical signal connections.
shows an example DDR SDRAM configuration with four physical banks each comprised of
MCS, MRAS, MCAS, MWE
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
Figure 9-34. Typical Dual Data Rate SDRAM Internal Organization
BANK ADDR
CKE, MCK, MCK
COMMAND:
ADDR
MRAS
MCAS
‘SUB’
MWE
MCS
MCK
MCK
Figure 9-35. Typical DDR SDRAM Interface Signals
CKE
BA1,BA0
DM
ADDR
DQM
13
2
SDRAM
Control
A[12:0]
BA[1:0]
Write Enable
64M x 1 Byte
Command
Bus
CK
512 Mbit
Data-Out Registers
Logical
Bank 0
DQ[7:0]
DQS
Logical
Bank 1
Read Data Latch
MUX, MASK,
Data Bus
8
Logical
Bank 2
Data-In Registers
DATA
DATA
STROBE
Logical
Bank 3
DDR Memory Controller
9-43