參數(shù)資料
型號(hào): EP7312-CR-90
廠商: CIRRUS LOGIC INC
元件分類(lèi): 微控制器/微處理器
英文描述: HIGH-PERFORMANCE, LOW-POWER SYSTEM ON CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE
中文描述: 32-BIT, FLASH, 90 MHz, RISC MICROCONTROLLER, PBGA204
封裝: 13 X 13 MM, TFBGA-204
文件頁(yè)數(shù): 23/64頁(yè)
文件大?。?/td> 1710K
代理商: EP7312-CR-90
DS508PP5
Copyright Cirrus Logic, Inc. 2003
(All Rights Reserved)
23
EP7312
High-Performance, Low-Power System on Chip
Static Memory Single Write Cycle
Note:
1. The cycle time can be extended by integer multiples of the clock period (22 ns at 45 MHz, 27 ns at 36 MHz, 54 ns at
18.432 MHz, and 77 ns at 13 MHz), by either driving EXPRDY low and/or by programming a number of wait states. EXPRDY is
sampled on the falling edge of EXPCLK before the data transfer. If low at this point, the transfer is delayed by one clock period
where EXPRDY is sampled again. EXPCLK need not be referenced when driving EXPRDY, but is shown for clarity.
2. Zero wait states for sequential writes is not permitted for memory devices which use nMWE pin, as this cannot be driven with
valid timing under zero wait state conditions.
3. Address, Data, Halfword, Word, and Write hold state until next cycle.
EXPCLK
nCS
A
nMWE
HALF-
WORD
WORD
D
WRITE
t
HWd
t
WDd
t
CSd
t
Ad
t
MWd
t
Dv
t
MWh
t
CSh
nMOE
EXPRDY
t
EXh
t
EXs
Figure 8. Static Memory Single Write Cycle Timing Measurement
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