参数资料
型号: EP7309-CBZ
厂商: Cirrus Logic Inc
文件页数: 9/42页
文件大小: 0K
描述: IC ARM720T MCU 74MHZ 256-PBGA
标准包装: 90
系列: EP7
核心处理器: ARM7
芯体尺寸: 32-位
速度: 74MHz
连通性: 编解码器,DAI,EBI/EMI,IrDA,键盘,SPI/Microwire1,UART/USART
外围设备: LCD,LED,MaverickKey,POR,PWM
输入/输出数: 27
程序存储器类型: ROMless
RAM 容量: 56K x 8
电压 - 电源 (Vcc/Vdd): 2.3 V ~ 2.7 V
振荡器型: 外部
工作温度: 0°C ~ 70°C
封装/外壳: 256-BGA
包装: 托盘
其它名称: 598-1211
DS507F2
Copyright Cirrus Logic, Inc. 2011
(All Rights Reserved)
17
EP7309
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
nM W E
HALF-
WORD
D
WRITE
t
HW d
t
WDd
t
CSd
t
Ad
t
MW d
t
Dv
t
MW h
t
CSh
nM OE
EXPRDY
t
EXh
t
EXs
Figure 4. Static Memory Single Write Cycle Timing Measurement
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