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參數(shù)資料
| 型號： | MPC755CRX400LE |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 400 MHz, RISC PROCESSOR, CBGA360 |
| 封裝： | 25 X 25 MM, 3.20 MM HEIGHT, 1.27 MM PITCH, CERAMIC, BGA-360 |
| 文件頁數(shù)： | 10/60頁 |
| 文件大?。?/td> | 1559K |
| 代理商： | MPC755CRX400LE |
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MPC755 RISC Microprocessor Hardware Specifications, Rev. 7.0
18
Freescale Semiconductor
Electrical and Thermal Characteristics
Table 11. L2CLK Output AC Timing Specification
At recommended operating conditions (see Table 3)
Parameter
Symbol
All Speed Grades
Unit
Notes
Min
Max
L2CLK frequency
fL2CLK
80
450
MHz
1, 4
L2CLK cycle time
tL2CLK
2.5
12.5
ns
L2CLK duty cycle
tCHCL/tL2CLK
45
55
%
2, 7
Internal DLL-relock time
640
—
L2CLK
3, 7
DLL capture window
0
10
ns
5, 7
L2CLK_OUT output-to-output skew
tL2CSKW
—50
ps
6, 7
L2CLK_OUT output jitter
—
±150
ps
6, 7
Notes:
1. L2CLK outputs are L2CLK_OUTA, L2CLK_OUTB, L2CLK_OUT, and L2SYNC_OUT pins. The L2CLK
frequency-to-core frequency settings must be chosen such that the resulting L2CLK frequency and core frequency
do not exceed their respective maximum or minimum operating frequencies. The maximum L2LCK frequency will
be system dependent. L2CLK_OUTA and L2CLK_OUTB must have equal loading.
2. The nominal duty cycle of the L2CLK is 50% measured at midpoint voltage.
3. The DLL-relock time is specified in terms of L2CLK periods. The number in the table must be multiplied by the period
of L2CLK to compute the actual time duration in ns. Relock timing is guaranteed by design and characterization.
4. The L2CR[L2SL] bit should be set for L2CLK frequencies less than 110 MHz. This adds more delay to each tap of
the DLL.
5. Allowable skew between L2SYNC_OUT and L2SYNC_IN.
6. This output jitter number represents the maximum delay of one tap forward or one tap back from the current DLL
tap as the phase comparator seeks to minimize the phase difference between L2SYNC_IN and the internal L2CLK.
This number must be comprehended in the L2 timing analysis. The input jitter on SYSCLK affects L2CLK_OUT and
the L2 address/data/control signals equally and, therefore, is already comprehended in the AC timing and does not
have to be considered in the L2 timing analysis.
7. Guaranteed by design.
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