MC7457VG1000LC Freescale Semiconductor, MC7457VG1000LC Datasheet - Page 57

• Manufacturer Part Number: MC7457VG1000LC
• Description: IC MPU RISC 1000MHZ 483FCCBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC7457VG1000LC

• Processor Type: MPC74xx PowerPC 32-Bit
• Speed: 1.0GHz
• Voltage: 1.3V
• Mounting Type: Surface Mount
• Package / Case: 483-FCCBGA
• Family Name: MPC74xx
• Device Core: PowerPC
• Device Core Size: 32b
• Frequency (max): 1GHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 1.3/1.5/1.8/2.5V
• Operating Supply Voltage (max): 1.35/1.575/2.625V
• Operating Supply Voltage (min): 1.25/1.425/1.71V
• Operating Temp Range: 0C to 105C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 483
• Package Type: FCCBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Compliant

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