參數(shù)資料
型號: CL-PS7111
廠商: Cirrus Logic, Inc.
英文描述: Low-Power System-on-a-Chip
中文描述: 低功耗系統(tǒng)級晶片
文件頁數(shù): 86/105頁
文件大?。?/td> 1207K
代理商: CL-PS7111
September 1997
85
PRELIMINARY DATA BOOK v2.0
ELECTRICAL SPECIFICATIONS
CL-PS7111
Low-Power System-on-a-Chip
Figure 6-7. DRAM CAS-Before-RAS Refresh Cycle
NOTES:
1)
t
CSA
(CAS set-up time) = 15 ns minimum at MCLK = 18.432 MHz, and 20 ns at 13.0 MHz
t
RAS
(RAS pulse width) = 80 ns minimum at MCLK = 18.432 MHz, and 110 ns at 13.0 MHz
t
RC
(cycle time) = 160 ns minimum at MCLK = 18.432 MHz, and 230 ns at 13.0 MHz
When DRAMs are placed in self-refresh (entering standby) the same timings apply, but t
RAS
is extended
indefinitely.
2)
3)
4)
t
RC
HELD
t
CSA
t
RAS
ROW
COL
HELD
MCLK
DRA[12:0]
RAS[1:0]
CAS[3:0]
D[31:0]
NMOE
NMWE
DRAM CAS before RAS refresh cycle (MCLK shown for reference only)
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