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MC9328MX21VH Datasheet(PDF) 25 Page - Motorola, Inc |
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MC9328MX21VH Datasheet(HTML) 25 Page - Motorola, Inc |
25 / 106 page Specifications MC9328MX21 Product Preview, Rev. 1.1 Freescale Semiconductor 25 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 on page 26 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 14. MMD Read BMI Timing Table when BMI Drives Clock Item Symbol MIN TYP MAX 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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