參數(shù)資料
型號(hào)： PC8265A
英文描述： PC8265A [Updated 9/03. 59 Pages]
中文描述： PC8265A [更新9 / 03。 59頁(yè)]
文件頁(yè)數(shù)： 38/59頁(yè)
文件大?。?/td> 455K
代理商： PC8265A
38
PC8265A PowerQUICC II
5336A–HIREL–08/03
AC Electrical
Characteristics
The following sections include illustrations and tables of clock diagrams, signals, and
CPM outputs and inputs for the 66 MHz PC8265A device. Note that AC timings are
based on a 50-pf load. Typical output buffer impedances are shown in Table 8.
Note:
1. These are typical values at 65
°
C. The impedance may vary by ±25% with process
and temperature.
Table 9 lists CPM output characteristics.
Note:
1. Output specifications are measured from the 50% level of the rising edge of CLKIN to the 50% level of the signal. Timings
are measured at the pin.
Table 10 lists CPM input characteristics.
Note:
1. Input specifications are measured from the 50% level of the signal to the 50% level of the rising edge of CLKIN. Timings are
measured at the pin.
Note that although the specifications generally reference the rising edge of the clock, the following AC timing diagrams also
apply when the falling edge is the active edge.
Table 8.
Output Buffer Impedances
(1)
Output Buffers
Typical Impedance
(
)
60x bus
40
Local bus
40
Memory Controller
40
Parallel I/O
46
PCI
25
Table 9.
AC Characteristics for CPM Outputs
(1)
Spec_num Max/Min
Characteristic
Max Delay (ns)
Min Delay (ns)
66 MHz
83 MHz
66 MHz
83 MHz
sp36a/sp37a
FCC outputs – internal clock (NMSI)
6
5.5
1
1
sp36b/sp37b
FCC outputs – external clock (NMSI)
14
12
2
1
sp38a/sp39a
SCC/SMC/SPI/I2C outputs – internal clock (NMSI)
19
16
1
0.5
sp38b/sp39b
Ex_SCC/SMC/SPI/I2C outputs – external clock (NMSI)
19
16
2
1
sp42/sp43
TIMER/IDMA outputs
14
11
1
0.5
sp42a/sp43a
PIO outputs
14
11
0.5
0.5
Table 10.
AC Characteristics for CPM Inputs
(1)
Spec_num
Characteristic
Setup (ns)
Hold (ns)
66 MHz
83 MHz
66 MHz
83 MHz
sp16a/sp17a
FCC inputs – internal clock (NMSI)
10
8
0
0
sp16b/sp17b
FCC inputs – external clock (NMSI)
3
2.5
3
2
sp20/sp21
TDM inputs/SI
15
12
12
10
sp18a/sp19a
SCC/SMC/SPI/I2C inputs – internal clock (NMSI)
20
16
0
0
sp18b/sp19b
SCC/SMC/SPI/I2C inputs – external clock (NMSI)
5
4
5
4
sp22/sp23
PIO/TIMER/IDMA inputs
10
8
3
3
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