參數(shù)資料
型號(hào): CWMPCEVB5200BE
廠商: Freescale Semiconductor
文件頁數(shù): 11/72頁
文件大?。?/td> 0K
描述: BOARD MPC5200B W/256MB
標(biāo)準(zhǔn)包裝: 1
類型: MPU
適用于相關(guān)產(chǎn)品: MPC5200B
所含物品:
MPC5200B Data Sheet, Rev. 4
Freescale Semiconductor
19
Figure 6. Timing Diagram—Standard SDRAM Memory Write Timing
1.3.6.3
Memory Interface Timing-DDR SDRAM Read Command
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.
Table 20. DDR SDRAM Memory Read Timing
Sym
Description
Min
Max
Units
SpecID
tmem_clk
MEM_CLK period
7.5
ns
A5.15
tvalid
Control Signals, Address and MBA
valid after rising edge of MEM_CLK
—tmem_clk ×0.5 +0.4
ns
A5.16
thold
Control Signals, Address and MBA
hold after rising edge of MEM_CLK
tmem_clk × 0.5
ns
A5.17
datasetup
Setup time relative to MDQS
0.4
ns
A5.18
datahold
Hold time relative to MDQS
2.6
ns
A5.19
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
thold
Row
Column
MBA (Bank Selects)
datahold
datavalid
tvalid
thold
tvalid
thold
tvalid
DQM (Data Mask)
DMvalid
DMhold
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CWMPCEVB5200BE 制造商:Freescale Semiconductor 功能描述:MPC5200B BOARD W/ 256MB
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