參數(shù)資料
型號: MCF5372
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Microprocessor Data Sheet
中文描述: 微處理器數(shù)據(jù)表
文件頁數(shù): 24/42頁
文件大?。?/td> 787K
代理商: MCF5372
MCF5373 ColdFire
Microprocessor Data Sheet, Rev. 0.3
Preliminary
Preliminary Electrical Characteristics
Freescale Semiconductor
24
Figure 12. Flexbus Write Timing
5.8
SDRAM Bus
The SDRAM controller supports accesses to main SDRAM memory from any internal master. It supports
either standard SDRAM or double data rate (DDR) SDRAM, but it does not support both at the same time.
5.8.1
SDR SDRAM AC Timing Characteristics
The following timing numbers indicate when data will be latched or driven onto the external bus, relative
to the memory bus clock, when operating in SDR mode on write cycles and relative to SD_DQS on read
cycles. The device’s SDRAM controller is a DDR controller that has an SDR mode. Because it is designed
to support DDR, a DQS pulse must still be supplied to device for each data beat of an SDR read. Te
processor accomplishes this by asserting a signal named SD_DQS during read cycles. Care must be taken
during board design to adhere to the following guidelines and specs with regard to the SDR_DQS signal
and its usage.
Table 11. SDR Timing Specifications
Symbol
Characteristic
Symbol
Min
Max
Unit
Notes
Frequency of Operation
TBD
80
Mhz
1
SD1
Clock Period
t
SDCK
12.5
TBD
ns
2
SD2
Clock Skew
t
SDSK
TBD
SD3
Pulse Width High
t
SDCKH
0.45
0.55
SD_CLK
3
FB_CLK
A[23:0]
D[31:0]
R/W
TS
FB_CS
n
BE/BWE
n
TA
FB1
FB2
FB3
FB3
FB6
FB7
OE
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