参数资料
型号: MC9328MX21CVK
厂商: Freescale Semiconductor
文件页数: 22/100页
文件大小: 0K
描述: IC MCU I.MX21 266MHZ 289-MAPBGA
标准包装: 152
系列: i.MX21
核心处理器: ARM9
芯体尺寸: 32-位
速度: 266MHz
连通性: 1 线,EBI/EMI,I²C,IrDA,MMC,智能卡,SPI,SSI,UART/USART,USB OTG
外围设备: DMA,I²S,LCD,POR,PWM,WDT
输入/输出数: 192
程序存储器类型: ROMless
电压 - 电源 (Vcc/Vdd): 1.45 V ~ 3.3 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 289-LFBGA
包装: 托盘
MC9328MX21 Technical Data, Rev. 3.4
28
Freescale Semiconductor
Specifications
Figure 12. Memory Interface Master Mode, BMI Write to External Slave Device Timing with Wait Signal
(MMD_MODE_SEL=0, MASTER_MODE_SEL=1,WAIT=1)
Figure 13 shows the BMI read timing when the WAIT bit is set. As write timing, when the BMI_READ is
asserted, the BMI will detect the BMI_WAIT signal on every falling edge of the Int_Clk. When it detected
the high level of the BMI_WAIT, the BMI_READ will be negated after 1+WS Int_Clk period. If the
BMI_WAIT is always high or already high before BMI_READ is asserted, this timing will same as
without WAIT signal. So the BMI_READ will be asserted at least for 1+WS Int_Clk period.
Figure 13. Memory Interface Master Mode, BMI Read to External Slave Device Timing with Wait Signal
(MMD_MODE_SEL=0, MASTER_MODE_SEL=1,WAIT=1)
3.9
CSPI Timing Diagrams
To use the internal transmit (TX) and receive (RX) data FIFOs when the CSPI1 module is configured as a
master, two control signals are used for data transfer rate control: the SS signal (output) and the SPI_RDY
signal (input). The SPI 1 Sample Period Control Register (PERIODREG1) and the SPI 2 Sample Period
Control Register (PERIODREG2) can also be programmed to a fixed data transfer rate for either CSPI1
or CSPI2. When the CSPI1 module is configured as a slave, the user can configure the SPI 1 Control
Register (CONTROLREG1) to match the external CSPI master’s timing. In this configuration, SS
1+ws
Int_Clk
BMI_CLK/CS
BMI_D[15:0]
BMI_WRITE
BMI_READ
BMI_WAIT
(reference only)
TXD_a
TXD_b
1+ws
Int_Clk
BMI_CLK/CS
BMI_D[15:0]
BMI_READ
BMI_WRITE
BMI_WAIT
(reference only)
RXD_a
RXD_b
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