參數(shù)資料
型號: EP7211-CP-A
廠商: CRYSTAL SEMICONDUCTOR CORP
元件分類: 外設及接口
英文描述: HIGH-PERFORMANCE ULTRA-LOW-POWER SYSTEM-ON-CHIP WITH LCD CONTROLLER
中文描述: MULTIFUNCTION PERIPHERAL, PBGA256
封裝: PLASTIC, BGA-256
文件頁數(shù): 138/166頁
文件大?。?/td> 2623K
代理商: EP7211-CP-A
EP7211
High-Performance Ultra-Low-Power System-on-Chip with LCD Controller
138
Electrical Specifications
DS352PP3
JUL 2001
Figure 6-3. Expansion and ROM Write Timings
NOTES:
1)
t
EXWR
= 35 ns at 36.864 MHz
70 ns at 18.432 MHz
120 ns at 13.0 MHz
Maximum values for minimum wait states. This time can be extended by integer multiples of the
clock period (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.
Consecutive reads with sequential access enabled are identical except that the sequential access
wait state field is used to determine the number of wait states, and no idle cycles are inserted
between successive non-sequential ROM/expansion cycles. This improves performance so the
SQAEN bit should always be set where possible.
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.
2)
3)
EXPCLK
NCS[5:0]
NMWE
A[27:0]
D[31:0]
EXPRDY
WORD
Bus held
Write data
Write data
1&6:5
$':5
Consecutive expansion write cycles with minimum wait states
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