參數(shù)資料
型號: MC9328MX21CVK
廠商: Freescale Semiconductor
文件頁數(shù): 18/100頁
文件大小: 0K
描述: IC MCU I.MX21 266MHZ 289-MAPBGA
標準包裝: 152
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: -40°C ~ 85°C
封裝/外殼: 289-LFBGA
包裝: 托盤
MC9328MX21 Technical Data, Rev. 3.4
24
Freescale Semiconductor
Specifications
Figure 8. BMI Drives Clock, MMD Read BMI Timing
(MASTER_MODE_SEL=0, MMD_MODE_SEL=1, MMD_CLKOUT=1)
Note:
In this mode, the max frequency of the BMI_CLK/CS can be up to 36MHz (double as max data pad speed).
Note:
The BMI_CLK/CS can only be divided by 2,4,8,16 from HCLK.
3.8.1.4
MMD Write BMI Timing
Figure 9 shows the MMD write BMI timing when BMI drives BMI_CLK/CS.
When the BMI_WRITE signal is asserted, the BMI can write a 1 to READ bit of control register to issue
a WRITE cycle. This bit is cleared automatically when the WRITE operation is completed. In a WRITE
burst the MMD will write COUNT+1 data to the BMI. The user can issue another WRITE operation if the
MMD still has data to write after the first operation completed.
The BMI can latch the data either at falling edge or the next rising edge of the BMI_CLK/CS according to
the DATA_LATCH bit. When the DATA_LATCH bit is set, the BMI latch data at the next rising edge and
latch the last data using the internal clock.
BMI_WRITE signal can not be negated when the WRITE operation is proceeding.
Table 16. MMD Read BMI Timing Table when BMI Drives Clock
Item
Symbol
Minimum
Typical
Maximum
Unit
Transfer data setup time
Tds
2
8
ns
Transfer data hold time
Tdh
2
8
ns
Read_req hold time
Trh
2
18
ns
BMI_CLK/CS
BMI_READ_REQ
BMI_WRITE
BMI_D[15:0]
TxD1
TxD2
Last TxD
1T
Tds
Trh
DMA or CPU write data to TxFIFO
Tdh
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