KMC7457VG1267LC Freescale Semiconductor, KMC7457VG1267LC Datasheet - Page 57

• Manufacturer Part Number: KMC7457VG1267LC
• Description: IC MPU RISC 32BIT 1267MHZ 483BGA
• Manufacturer: Freescale Semiconductor

Specifications of KMC7457VG1267LC

• Processor Type: MPC74xx PowerPC 32-Bit
• Speed: 1.267GHz
• Voltage: 1.3V
• Mounting Type: Surface Mount
• Package / Case: 483-FCCBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

System Design Information
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.
MPC7457 RISC Microprocessor Hardware Specifications, Rev. 7
Freescale Semiconductor
57