参数资料
型号: MPC885ZP80
厂商: Freescale Semiconductor
文件页数: 9/87页
文件大小: 0K
描述: IC MPU POWERQUICC 80MHZ 357PBGA
标准包装: 44
系列: MPC8xx
处理器类型: 32-位 MPC8xx PowerQUICC
速度: 80MHz
电压: 3.3V
安装类型: 表面贴装
封装/外壳: 357-BBGA
供应商设备封装: 357-PBGA(25x25)
包装: 托盘
MPC885/MPC880 PowerQUICC Hardware Specifications, Rev. 7
Freescale Semiconductor
17
Bus Signal Timing
Table 9 provides the timings for the MPC885/MPC880 at 33-, 40-, 66-, and 80-MHz bus operation.
The timing for the MPC885/MPC880 bus shown assumes a 50-pF load for maximum delays and a 0-pF
load for minimum delays. CLKOUT assumes a 100-pF load for maximum delays and a 50-pF load for
minimum delays.
Table 7. Frequency Ranges for Standard Part Frequencies (1:1 Bus Mode)
Part Frequency
66 MHz
80 MHz
Min
Max
Min
Max
Core frequency
40
66.67
40
80
Bus frequency
40
66.67
40
80
Table 8. Frequency Ranges for Standard Part Frequencies (2:1 Bus Mode)
Part Frequency
66 MHz
80 MHz
133 MHz
Min
Max
Min
Max
Min
Max
Core frequency
40
66.67
40
80
40
133
Bus frequency
20
33.33
20
40
20
66
Table 9. Bus Operation Timings
Num
Characteristic
33 MHz
40 MHz
66 MHz
80 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 EXTCLK
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
6.1
9.1
5.0
7.5
ns
B3
CLKOUT pulse width high (MIN = 0.4
× B1,
MAX = 0.6
× B1)
12.1
18.2
10.0
15.0
6.1
9.1
5.0
7.5
ns
B4
CLKOUT rise time
4.00
4.00
4.00
4.00
ns
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