參數(shù)資料
型號(hào)： MC7448THX1000ND
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 1000 MHz, RISC PROCESSOR, CBGA360
封裝： 25 X 25 MM, 2.40 MM HEIGHT, 1.27 MM PITC, CERAMIC, BGA-360
文件頁(yè)數(shù)： 31/66頁(yè)
文件大?。?/td> 793K
代理商： MC7448THX1000ND
MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4
Freescale Semiconductor
37
System Design Information
9.1.2
System Bus Clock (SYSCLK) and Spread Spectrum Sources
Spread spectrum clock sources are an increasingly popular way to control electromagnetic interference
emissions (EMI) by spreading the emitted noise to a wider spectrum and reducing the peak noise
magnitude in order to meet industry and government requirements. These clock sources intentionally add
long-term jitter in order to diffuse the EMI spectral content. The jitter specification given in Table 8
considers short-term (cycle-to-cycle) jitter only and the clock generator’s cycle-to-cycle output jitter
should meet the MPC7448 input cycle-to-cycle jitter requirement. Frequency modulation and spread are
separate concerns, and the MPC7448 is compatible with spread spectrum sources if the recommendations
listed in Table 13 are observed.
It is imperative to note that the processor’s minimum and maximum SYSCLK, core, and VCO frequencies
must not be exceeded regardless of the type of clock source. Therefore, systems in which the processor is
operated at its maximum rated core or bus frequency should avoid violating the stated limits by using
down-spreading only.
9.2
Power Supply Design and Sequencing
The following sections provide detailed information regarding power supply design for the MPC7448.
9.2.1
Power Supply Sequencing
The MPC7448 requires its power rails and clock to be applied in a specific sequence to ensure proper
device operation and to prevent device damage. The power sequencing requirements are as follows:
AVDD must be delayed with respect to VDD by the RC time constant of the PLL filter circuit
described in Section 9.2.2, “PLL Power Supply Filtering”. This time constant is nominally 100 s.
OVDD may ramp anytime before or after VDD and AVDD.
Additionally, the following requirements exist regarding the application of SYSCLK:
The voltage at the SYSCLK input must not exceed VDD until VDD has ramped to 0.9 V.
The voltage at the SYSCLK input must not exceed OVDD by more 20% during transients (see
overshoot/undershoot specifications in Figure 2) or 0.3 V DC (see Table 2) at any time.
Table 13. Spread Spectrum Clock Source Recommendations
At recommended operating conditions. See Table 4.
Parameter
Min
Max
Unit
Notes
Frequency modulation
—
50
kHz
1
Frequency spread
—
1.0
%
1, 2
Notes:
1. Guaranteed by design
2. SYSCLK frequencies resulting from frequency spreading, and the resulting core and VCO
frequencies, must meet the minimum and maximum specifications given in Table 8.
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