參數(shù)資料
型號： MC7447AVS867NB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 867 MHz, RISC PROCESSOR, CBGA360
封裝： 25 X 25 MM, 2.20 MM HEIGHT, 1.27 MM PITCH, ROHS COMPLIANT, CERAMIC, LGA-360
文件頁數(shù)： 36/58頁
文件大?。?/td> 1095K
代理商： MC7447AVS867NB
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
41
System Design Information
The COP header shown in Figure 19 adds many benefits—breakpoints, watchpoints, register and memory
examination/modification, and other standard debugger features are possible through this interface—and
can be as inexpensive as an unpopulated footprint for a header to be added when needed.
The COP interface has a standard header for connection to the target system, based on the 0.025"
square-post, 0.100" centered header assembly (often called a Berg header). The connector typically has
pin 14 removed as a connector key.
There is no standardized way to number the COP header shown in Figure 19; consequently, many different
pin numbers have been observed from emulator vendors. Some are numbered top-to-bottom then
left-to-right, while others use left-to-right then top-to-bottom, while still others number the pins counter
clockwise from pin 1 (as with an IC). Regardless of the numbering, the signal placement recommended in
Figure 19 is common to all known emulators.
The QACK signal shown in Figure 19 is usually connected to the PCI bridge chip in a system and is an
input to the MPC7447A informing it that it can go into the quiescent state. Under normal operation this
occurs during a low-power mode selection. In order for COP to work, the MPC7447A must see this signal
asserted (pulled down). While shown on the COP header, not all emulator products drive this signal. If the
product does not, a pull-down resistor can be populated to assert this signal. Additionally, some emulator
products implement open-drain type outputs and can only drive QACK asserted; for these tools, a pull-up
resistor can be implemented to ensure this signal is negated when it is not being driven by the tool. Note
that the pull-up and pull-down resistors on the QACK signal are mutually exclusive and it is never
necessary to populate both in a system. To preserve correct power-down operation, QACK should be
merged through logic so that it also can be driven by the PCI bridge.
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