參數資料
型號: MPC5200B
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: SDRAM/DDR Memory Controller
中文描述: 內存/ DDR存儲器控制器
文件頁數: 20/78頁
文件大?。?/td> 629K
代理商: MPC5200B
MPC5200B Data Sheet, Rev. 1
Electrical and Thermal Characteristics
Freescale Semiconductor
20
3.3.5
SDRAM
3.3.5.1
Memory Interface Timing-Standard SDRAM Read Command
Figure 5. Timing Diagram—Standard SDRAM Memory Read Timing
3.3.5.2
In Standard SDRAM, all signals are activated on the MEM_CLK from the Memory Controller and
captured on the MEM_CLK clock at the memory device.
Memory Interface Timing-Standard SDRAM Write Command
Table 18. Standard SDRAM Memory Read Timing
Sym
Description
Min
Max
Units
SpecID
t
mem_clk
MEM_CLK period
7.5
ns
A5.1
t
valid
Control Signals, Address and MBA Valid after
rising edge of MEM_CLK
t
mem_clk
*0.5+0.4
ns
A5.2
t
hold
Control Signals, Address and MBA Hold after
rising edge of MEM_CLK
t
mem_clk
*0.5
ns
A5.3
DM
valid
DQM valid after rising edge of MEM_CLK
t
mem_clk
*0.25+0.4
ns
A5.4
DM
hold
DQM hold after rising edge of MEM_CLK
t
mem_clk
*0.25-0.7
ns
A5.5
data
setup
MDQ setup to rising edge of MEM_CLK
0.3
ns
A5.6
data
hold
MDQ hold after rising edge of MEM_CLK
0.2
ns
A5.7
MEM_CLK
Control Signals
MDQ (Data)
MA (Address)
NOTE: Control Signals are composed of RAS, CAS, MEM_WE, MEM_CS, MEM_CS1 and CLK_EN
Active
NOP
READ
NOP
NOP
NOP
NOP
t
hold
Row
Column
MBA (Bank Selects)
t
valid
t
hold
t
valid
t
hold
t
valid
DQM (Data Mask)
DM
valid
DM
hold
NOP
data
hold
data
setup
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