參數(shù)資料
型號(hào): MPC5200B
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: SDRAM/DDR Memory Controller
中文描述: 內(nèi)存/ DDR存儲(chǔ)器控制器
文件頁(yè)數(shù): 21/78頁(yè)
文件大?。?/td> 629K
代理商: MPC5200B
Electrical and Thermal Characteristics
MPC5200B Data Sheet, Rev. 1
Freescale Semiconductor
21
Figure 6. Timing Diagram—Standard SDRAM Memory Write Timing
3.3.5.3
The SDRAM Memory Controller uses a 1/4 period delayed MDQS strobe to capture the MDQ data. The
1/4 period delay value is calculated automatically by hardware.
Memory Interface Timing-DDR SDRAM Read Command
Table 19. Standard SDRAM Write Timing
Sym
Description
Min
Max
Units
SpecID
t
mem_clk
MEM_CLK period
7.5
ns
A5.8
t
valid
Control Signals, Address and MBA Valid
after rising edge of MEM_CLK
t
mem_clk
*0.5+0.4
ns
A5.9
t
hold
Control Signals, Address and MBA Hold after
rising edge of MEM_CLK
t
mem_clk
*0.5
ns
A5.10
DM
valid
DQM valid after rising edge of MEM_CLK
t
mem_clk
*0.25+0.4
ns
A5.11
DM
hold
DQM hold after rising edge of Mem_clk
t
mem_clk
*0.25-0.7
ns
A5.12
data
valid
MDQ valid after rising edge of MEM_CLK
t
mem_clk
*0.75+0.4
ns
A5.13
data
hold
MDQ hold after rising edge of MEM_CLK
t
mem_clk
*0.75-0.7
ns
A5.14
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
WRITE
NOP
NOP
NOP
NOP
NOP
t
hold
Row
Column
MBA (Bank Selects)
data
hold
data
valid
t
valid
t
hold
t
valid
t
hold
t
valid
DQM (Data Mask)
DM
valid
DM
hold
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