MCF5208 ColdFire Microprocessor Data Sheet, Rev. 3 Fr" />
參數資料
型號: MCF5208CAB166
廠商: Freescale Semiconductor
文件頁數: 25/46頁
文件大?。?/td> 0K
描述: MCU 32BIT 166.67MHZ 160-QFP
標準包裝: 24
系列: MCF520x
核心處理器: Coldfire V2
芯體尺寸: 32-位
速度: 166.67MHz
連通性: EBI/EMI,以太網,I²C,SPI,UART/USART
外圍設備: DMA,WDT
輸入/輸出數: 50
程序存儲器類型: ROMless
RAM 容量: 16K x 8
電壓 - 電源 (Vcc/Vdd): 1.4 V ~ 3.6 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 160-BQFP
包裝: 托盤
Electrical Characteristics
MCF5208 ColdFire Microprocessor Data Sheet, Rev. 3
Freescale Semiconductor
31
5.8.2
DDR SDRAM AC Timing Characteristics
When using the SDRAM controller in DDR mode, the following timing numbers must be followed to
properly latch or drive data onto the memory bus. All timing numbers are relative to the four DQS byte
lanes. The following timing numbers are subject to change at anytime, and are only provided to aid in early
board design. Please contact your local Freescale representative if questions develop.
Table 13. DDR Timing Specifications
Num
Characteristic
Symbol
Min
Max
Unit
Notes
Frequency of Operation
60
83.33
Mhz
1
NOTES:
1
The frequency of operation is 2x or 4x the FB_CLK frequency of operation. FlexBus and SDRAM clock operate at the same
frequency as the internal bus clock.
DD1
Clock Period (SD_CLK)
tDDCK
12
16.67
ns
2
SD_CLK is one SDRAM clock in (ns).
DD2
Pulse Width High
tDDCKH
0.45
0.55
SD_CLK
3
Pulse width high plus pulse width low cannot exceed min and max clock period.
DD3
Pulse Width Low
tDDCKL
0.45
0.55
SD_CLK
3
DD4
Address, SD_CKE, SD_CAS, SD_RAS, SD_WE,
SD_CS[1:0] - Output Valid
tSDCHACV
—0.5
× SD_CLK
+1.0
ns
4
4 Command output valid should be 1/2 the memory bus clock (SD_CLK) plus some minor adjustments for process, temperature, and
voltage variations.
DD5
Address, SD_CKE, SD_CAS, SD_RAS, SD_WE,
SD_CS[1:0] - Output Hold
tSDCHACI
2.0
ns
DD6
Write Command to first DQS Latching Transition
tCMDVDQ
1.25
SD_CLK
DD7
Data and Data Mask Output Setup (DQ-->DQS)
Relative to DQS (DDR Write Mode)
tDQDMV
1.5
ns
5
6
5
This specification relates to the required input setup time of today’s DDR memories. The device’s output setup should be larger
than the input setup of the DDR memories. If it is not larger, the input setup on the memory is in violation.
MEM_DATA[31:24] is relative to MEM_DQS[3], MEM_DATA[23:16] is relative to MEM_DQS[2], MEM_DATA[15:8] is relative to
MEM_DQS[1], and MEM_[7:0] is relative MEM_DQS[0].
6
The first data beat is valid before the first rising edge of DQS and after the DQS write preamble. The remaining data beats are valid
for each subsequent DQS edge.
DD8
Data and Data Mask Output Hold (DQS-->DQ)
Relative to DQS (DDR Write Mode)
tDQDMI
1.0
ns
7
DD9
Input Data Skew Relative to DQS (Input Setup)
tDVDQ
—1
ns
8
DD10
Input Data Hold Relative to DQS.
tDIDQ
0.25
× SD_CLK
+0.5ns
—ns
9
DD11
DQS falling edge from SDCLK rising (output hold time)
tDQLSDCH
0.5
ns
DD12
DQS input read preamble width (tRPRE)tDQRPRE
0.9
1.1
SD_CLK
DD13
DQS input read postamble width (tRPST)tDQRPST
0.4
0.6
SD_CLK
DD14
DQS output write preamble width (tWPRE)tDQWPRE
0.25
SD_CLK
DD15
DQS output write postamble width (tWPST)tDQWPST
0.4
0.6
SD_CLK
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