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MPC7457 bảng dữ liệu(PDF) 58 Page - Freescale Semiconductor, Inc

tên linh kiện MPC7457
Giải thích chi tiết về linh kiện  Microprocessor
PDF  71 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MPC7457 bảng dữ liệu(HTML) 58 Page - Freescale Semiconductor, Inc

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MPC7457 RISC Microprocessor Hardware Specifications, Rev. 8
System Design Information
Freescale Semiconductor
58
The QACK signal shown in Figure 26 is usually connected to the PCI bridge chip in a system and is an
input to the MPC7457 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 MPC7457 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 deasserted 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 via logic so that it also can be driven by the PCI bridge.



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