參數(shù)資料
型號(hào)： MC9328MX21VM
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 14/100頁(yè)
文件大?。?/td> 0K
描述： IC MCU I.MX21 266MHZ 289-MAPBGA
標(biāo)準(zhǔn)包裝： 90
系列： i.MX21
核心處理器： ARM9
芯體尺寸： 32-位
速度： 266MHz
連通性： 1 線，EBI/EMI，I²C，IrDA，MMC，智能卡，SPI，SSI，UART/USART，USB OTG
外圍設(shè)備： DMA，I²S，LCD，POR，PWM，WDT
輸入/輸出數(shù)： 192
程序存儲(chǔ)器類型： ROMless
電壓 - 電源 (Vcc/Vdd)： 1.45 V ~ 3.3 V
振蕩器型： 外部
工作溫度： 0°C ~ 70°C
封裝/外殼： 289-LFBGA
包裝： 托盤
MC9328MX21 Technical Data, Rev. 3.4
20
Freescale Semiconductor
Specifications
The output External Grant signal from the DMAC is an active-low signal.When the following conditions
are true, the External DMA Grant signal is asserted with the initiation of the DMA burst.
The DMA channel for which the DMA burst is ongoing has request source as external DMA
Request
(as per source select register setting).
REN and CEN bit of this channel are set.
External DMA Request is asserted.
After the grant is asserted, the External DMA request will not be sampled until completion of the DMA
burst. As the external request is synchronized, the request synchronization will not be done during this
period. The priority of the external request becomes low for the next consecutive burst, if another DMA
request signal is asserted.
Worst case—that is, the smallest burst (1 byte read/write) timing diagrams are shown in Figure 4 and
Figure 5. Minimum and maximum timings for the External request and External grant signals are present
Figure 4 shows the minimum time for which the External Grant signal remains asserted when an External
DMA request is de-asserted immediately after sensing grant signal active.
Figure 4. Assertion of DMA External Grant Signal
Figure 5 shows the safe maximum time for which External DMA request can be kept asserted, after
sensing grant signal active such that a new burst is not initiated.
Figure 5. Safe Maximum Timings for External Request De-Assertion
Ext_DMAReq
Ext_DMAGrant
tmin_assert
Ext_DMAReq
Data read from
External device
Data written to
External device
Ext_DMAGrant
tmax_write
tmax_read
tmax_req_assert
NOTE: Assuming in worst case the data is read/written from/to External device as per the above waveform.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC9328MX21VM 制造商:Freescale Semiconductor 功能描述:Microprocessor
MC9328MX21VMR2 功能描述:處理器 - 專門應(yīng)用 DB I.MX21 17X17 PB-FR RoHS:否 制造商:Freescale Semiconductor 類型:Multimedia Applications 核心:ARM Cortex A9 處理器系列:i.MX6 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:1 GHz 指令/數(shù)據(jù)緩存: 數(shù)據(jù) RAM 大小:128 KB 數(shù)據(jù) ROM 大小: 工作電源電壓: 最大工作溫度:+ 95 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MAPBGA-432
MC9328MXL 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:MX Family of applications processors
MC9328MXL/D 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:i.MX Integrated Portable System Processor
MC9328MXL_06 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:MX Family of applications processors
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