参数资料
型号: MPC8377E-RDBA
厂商: Freescale Semiconductor
文件页数: 34/127页
文件大小: 0K
描述: BOARD REF DES MPC8377 REV 2.1
设计资源: MPC8379E-RDB Ref Design Guide
标准包装: 1
系列: PowerQUICC II™ PRO
类型: MPU
适用于相关产品: MPC8377E
所含物品: 板,CD
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MPC8377E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
14
Freescale Semiconductor
4.1
DC Electrical Characteristics
This table provides the clock input (CLKIN/PCI_CLK) DC timing specifications for the device.
4.2
AC Electrical Characteristics
The primary clock source for the device can be one of two inputs, CLKIN or PCI_CLK, depending on
whether the device is configured in PCI host or PCI agent mode. This table provides the clock input
(CLKIN/PCI_CLK) AC timing specifications for the device.
Table 7. CLKIN DC Electrical Characteristics
Parameter
Condition
Symbol
Min
Max
Unit
Note
Input high voltage
VIH
2.7
OVDD + 0.3
V
Input low voltage
VIL
–0.3
0.4
V
CLKIN Input current
0 V
≤ VIN ≤ OVDD
IIN
—± 10
μA—
PCI_CLK Input current
0 V
≤ VIN ≤ 0.5 V or
OVDD – 0.5 V ≤ VIN ≤ OVDD
IIN
—± 30
μA—
Note:
1. In PCI agent mode, this specification does not comply with
PCI 2.3 Specification.
Table 8. CLKIN AC Timing Specifications
Parameter
Symbol
Min
Typical
Max
Unit
Note
CLKIN/PCI_CLK frequency
fCLKIN
25
66.666
MHz
1, 6
CLKIN/PCI_CLK cycle time
tCLKIN
15
40
ns
CLKIN/PCI_CLK rise and fall time
tKH, tKL
0.6
1.0
2.3
ns
CLKIN/PCI_CLK duty cycle
tKHK/tCLKIN
40
60
%
CLKIN/PCI_CLK jitter
± 150
ps
Notes:
1. Caution: The system, core and security block must not exceed their respective maximum or minimum operating
frequencies.
2. Rise and fall times for CLKIN/PCI_CLK are measured at 0.4 V and 2.7 V.
3. Timing is guaranteed by design and characterization.
4. This represents the total input jitter-short term and long term-and is guaranteed by design.
5. The CLKIN/PCI_CLK driver’s closed loop jitter bandwidth should be < 500 kHz at –20 dB. The bandwidth must be set low
to allow cascade-connected PLL-based devices to track CLKIN drivers with the specified jitter.
6. Spread spectrum is allowed up to 1% down-spread on CLKIN/PCI_CLK up to 60 KHz.
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