参数资料
型号: MPC852TCVR66A
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 66 MHz, RISC PROCESSOR, PBGA256
封装: PLASTIC, BGA-256
文件页数: 6/80页
文件大小: 998K
代理商: MPC852TCVR66A
MPC852T PowerQUICC Hardware Specifications, Rev. 4
14
Freescale Semiconductor
Bus Signal Timing
12 Bus Signal Timing
The maximum bus speed that the MPC852T supports is 66 MHz. Table 7 shows the frequency ranges for
standard part frequencies.
Table 9 provides the bus operation timing for the MPC852T at 33, 40, 50, and 66 MHz.
The timing for the MPC852T bus shown assumes a 50-pF load for maximum delays and a 0-pF load for
minimum delays. CLKOUT assumes a 100-pF load maximum delay
Table 7. Frequency Ranges for Standard Part Frequencies (1:1 Bus Mode)
Part Frequency
50 MHz
66 MHz
Min
Max
Min
Max
Core
40
50
40
66.67
Bus
40
50
40
66.67
Table 8. Frequency Ranges for Standard Part Frequencies (2:1 Bus Mode)
Part Frequency
50 MHz
66 MHz
80 MHz
100 MHz
Min
Max
Min
Max
Min
Max
Min
Max
Core
40
50
40
66.67
40
80
40
100
Bus 2:1
20
25
20
33.33
20
40
20
50
Table 9. Bus Operation Timings
Num
Characteristic
33 MHz
40 MHz
50 MHz
66 MHz
Unit
Min
Max
Min
Max
Min
Max
Min
Max
B1
Bus period (CLKOUT) See Table 7
————————
ns
B1a
EXTCLK to CLKOUT phase skew—If
CLKOUT is an integer multiple of
EXTCLK, then the rising edge of EXTCLK
is aligned with the rising edge of CLKOUT.
For a non-integer multiple of EXTCLK, this
synchronization is lost, and the rising
edges of EXTCLK and CLKOUT have a
continuously varying phase skew.
–2
+2
–2
+2
–2
+2
–2
+2
ns
B1b
CLKOUT frequency jitter peak-to-peak
1
1
1
1
ns
B1c
Frequency jitter on EXTCLK1
0.50
0.50
0.50
0.50
%
B1d
CLKOUT phase jitter peak-to-peak for
OSCLK
≥ 15 MHz
—4
ns
CLKOUT phase jitter peak-to-peak for
OSCLK < 15 MHz
—5
ns
B2
CLKOUT pulse width low (MIN = 0.4
× B1,
MAX = 0.6
× B1)
12.1
18.2
10.0
15.0
8.0
12.0
6.1
9.1
ns
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