參數(shù)資料
型號： MC94MX21DVKN3R2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 350 MHz, MICROPROCESSOR, PBGA289
封裝： 14 X 14 MM, 1.41 MM HEIGHT, 0.65 MM PITCH, LEAD FREE, PLASTIC, BGA-289
文件頁數(shù)： 13/98頁
文件大?。?/td> 1326K
代理商： MC94MX21DVKN3R2
MC94MX21 Technical Data, Rev. 1.
5
20
Freescale Semiconductor
Specifications
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
3.8
BMI Interface Timing Diagram
3.8.1
Connecting BMI to ATI MMD Devices
3.8.1.1
ATI MMD Devices Drive the BMI_CLK/CS
In this mode MMD_MODE_SEL bit is set and MMD_CLKOUT bit is cleared. BMI_WRITE and
BMI_CLK/CS are input signals to BMI driving by ATI MMD chip set. Output signal BMI_READ_REQ
can be used as interrupt signal to inform MMD that data is ready in BMI TxFIFO for read access. MMD
Table 12. DMA External Request and Grant Timing Parameters
Parameter
Description
3.0 V
1.8 V
Unit
WCS
BCS
WCS
BCS
tmin_assert
Minimum assertion time of External Grant
signal
8 hclk + 8.6
8 hclk + 2.74
8 hclk + 7.17
8 hclk + 3.25
ns
tmax_req_assert Maximum External request assertion time
after assertion of Grant signal
9 hclk - 20.66
9 hclk - 6.7
9 hclk - 17.96
9 hclk - 8.16
ns
tmax_read
Maximum External request assertion time
after first read completion
8 hclk - 6.21
8 hclk - 0.77
8 hclk - 5.84
8 hclk - 0.66
ns
tmax_write
Maximum External request assertion time
after completion of first write
3 hclk - 15.87
3 hclk - 8.83
3 hclk - 15.9
3 hclk - 9.12
ns
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.
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
MC94MX21DVKN3
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