參數(shù)資料
型號： TMX320DM648ZUT900
廠商： Texas Instruments, Inc.
英文描述： Digital Media Processor
中文描述： 數(shù)字媒體處理器
文件頁數(shù)： 47/166頁
文件大?。?/td> 1341K
代理商： TMX320DM648ZUT900
www.ti.com
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3.3 Debugging Considerations
3.4 Pullup/Pulldown Resistors
TMS320DM647/TMS320DM648
Digital Media Processor
SPRS372–MAY 2007
Figure 3-12. MAC_ADDR_RW1 Register
31
24
23
16
CRC
Reserved
R/W-CRC for the MAC_ID
R/W-00000000
15
0
MAC_ID
R-MAC ADDRESS[47:32]
LEGEND: R/W = Read/Write; R = Read only; -
n
= value after reset
Table 3-11. MAC_ADDR_RW1 Register Field Descriptions
Bit
31:24
Field
CRC
Value
CRC of the
MAC ID
0x00
Mac
Address[47:32]
of the device
Description
This field will hold the CRC of the MAC address of that particular device.
23:16
15:0
Reserved
MAC_ID
Reserved
Bit 0 of MAC_ID is Bit 32 of MAC Address
Proper board design should specify that input pins to the device always be at a valid logic level and not
floating. This may be achieved via pullup/pulldown resistors. The DM64x features internal pullup (IPU) and
internal pulldown (IPD) resistors on most pins to eliminate the need, unless otherwise noted, for
external
pullup/pulldown resistors.
An external pullup/pulldown resistor must be used in the following situations:
Boot and Configuration Pins
: If the pin is both routed out and in high-impedance mode, an external
pullup/pulldown resistor
must
be used, even if the IPU/IPD matches the desired value/state.
Other Input Pins
: If the IPU/IPD
does not
match the desired value/state, use an external
pullup/pulldown resistor to pull the signal to the opposite rail.
If the boot and configuration pins are both routed out and in high-impedance mode, it is recommended
that an external pullup/pulldown resistor be used. Although internal pullup/pulldown resistors exist on
these pins and they may match the desired configuration value, providing external connectivity can help
specify that valid logic levels are latched on these important boot configuration pins. In addition, applying
external pullup/pulldown resistors on the boot and configuration pins adds convenience to the user in
debugging and flexibility in switching operating modes.
Tips for choosing an external pullup/pulldown resistor:
Select a resistor with the largest possible resistance
Calculate the worst-case leakage current that flows through this external resistor. Worst-case leakage
current can be calculated by adding up all the leakage current at the pin—e.g., the input current (I
I
)
from DM64x, and leakage current from the other device(s) to which this pin is connected.
Specify that the voltage at the pin stays well within the low-/high-level input voltages (V
IL
or V
IH
) when
worst-case leakage current is flowing through this external resistor.
–
To oppose an IPU and pull the signal to a logic low, the voltage at the pin must stay well below V
IL
.
–
To oppose an IPD and pull the signal to a logic high, the voltage at the pin must stay well above
V
IH
.
Submit Documentation Feedback
Device Configuration
47
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