mpc5200cvr400br2 Freescale Semiconductor, Inc, mpc5200cvr400br2 Datasheet - Page 23

• Manufacturer Part Number: mpc5200cvr400br2
• Description: Mpc5200b 32-bit Embedded Processor
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
Sample position A: data are sampled on the expected edge of MEM_CLK, the MDQS signal indicate the valid data
Sample position B: data are sampled on a later edge of MEM_CLK, SDRAM controller is waiting for the vaild MDQS signal
NOTE: Control Signals signals are composed of RAS, CAS, MEM_WE, MEM_CS, MEM_CS1 and CLK_EN
MDQS (Data Strobe)
MBA (Bank Selects)
Sample Window
MDQS (Data Strobe)
Sample Window
MA (Address)
Control Signals
MDQ (Data)
Read Data
MDQ (Data)
Read Data
MEM_CLK
MEM_CLK
t
t
valid
valid
Figure 7. Timing Diagram—DDR SDRAM Memory Read Timing
t
valid
Active
Row
t
t
t
hold
hold
hold
NOP
MPC5200B Data Sheet, Rev. 1
Column
READ
t
data_sample_min
t
data_valid_min
NOP
t
data_valid_min
0.5 *
t
MEM_CLK
NOP
t
t
data_sample_max
Electrical and Thermal Characteristics
data_valid_max
NOP
t
t
t
data_sample_min
data_sample_max
data_valid_max
NOP
NOP
Sample
position
Sample
position
A
B
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