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| 型号： | MSC7110VF800 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 显示控制器 |
| 英文描述： | FLUORESCENT DSPL CTRL, PBGA400 |
| 封装： | 17 X 17 MM, BGA-400 |
| 文件页数： | 43/56页 |
| 文件大小： | 702K |
| 代理商： | MSC7110VF800 |
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MSC7110 Low-Cost 16-bit DSP with DDR Controller Data Sheet, Rev. 11
Hardware Design Considerations
Freescale Semiconductor
48
3.3.4
External I/O Power
The estimation of the I/O power is similar to the computation of the peripheral power estimates. The power consumption per
signal line is computed assuming a maximum load of 20 pF, a voltage swing of 3.3 V, and a switching frequency of 25 MHz or
33 MHz, which yields:
PIO = 20 pF × (3.3 V)
2 × 25 MHz × 10–3 = 5.44 mW per I/O line
Eqn. 16
PIO = 20 pF × (3.3 V)
2
× 33 MHz × 10–3 = 7.19 mW per I/O line
Eqn. 17
Multiply this number by the number of I/O signal lines used in the application design to compute the total I/O power.
Note:
The signal loading depends on the board routing. For systems using a single DDR device, the load could be as low as
7 pF.
3.3.5
Leakage Power
The leakage power is for all power supplies combined at a specific temperature. The value is temperature dependent. The
observed leakage value at room temperature is 64 mW.
3.3.6
Example Total Power Consumption
Using the examples in this section and assuming four peripherals and 10 I/O lines active, a total power consumption value is
estimated as the following:
PTOTAL (200 MHz core) = 216 + (4 × 2.88) + 324,2 + (10 × 5.44) + 64 = 670.12 mW
Eqn. 18
PTOTAL (266 MHz core) = 287 + (4 × 3.83) + 326.3 + (10 × 7.19) + 64 = 764.52 mW
Eqn. 19
3.4
Reset and Boot
This section describes the recommendations for configuring the MSC7110 at reset and boot.
3.4.1
Reset Circuit
HRESET
is a bidirectional signal and, if driven as an input, should be driven with an open collector or open-drain device. For
an open-drain output such as HRESET, take care when driving many buffers that implement input bus-hold circuitry. The
bus-hold currents can cause enough voltage drop across the pull-up resistor to change the logic level to low. Either a smaller
value of pull-up or less current loading from the bus-hold drivers overcomes this issue. To avoid exceeding the MSC7110 output
current, the pull-up value should not be too small (a 1 K
Ω pull-up resistor is used in the MSC711xADS reference design).
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:
MSC711XADS
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