參數(shù)資料
型號： XPC862
廠商： Motorola, Inc.
英文描述： Hardware Specifications
中文描述： 硬件規(guī)格
文件頁數(shù)： 23/88頁
文件大小： 483K
代理商： XPC862
MOTOROLA
MPC862/857T/857DSL Hardware Specifications
For More Information On This Product,
Go to: www.freescale.com
23
Bus Signal Timing
B42
CLKOUT rising edge to TS valid (hold
time) (MIN = 0.00 x B1 + 2.00)
2.00
—
2.00
—
2.00
—
2.00
—
ns
B43
AS negation to memory controller
signals negation (MAX = TBD)
—
TBD
—
TBD
—
TBD
—
TBD
ns
1
Phase and frequency jitter performance results are only valid if the input jitter is less than the prescribed value.
2
If the rate of change of the frequency of EXTAL is slow (I.e. it does not jump between the minimum and maximum
values in one cycle) or the frequency of the jitter is fast (I.e., it does not stay at an extreme value for a long time) then
the maximum allowed jitter on EXTAL can be up to 2%.
3
The timings specified in B4 and B5 are based on full strength clock.
4
The timing for BR output is relevant when the MPC862/857T/857DSL is selected to work with external bus arbiter.
The timing for BG output is relevant when the MPC862/857T/857DSL is selected to work with internal bus arbiter.
5
For part speeds above 50MHz, use 9.80ns for B11a.
6
The timing required for BR input is relevant when the MPC862/857T/857DSL is selected to work with internal bus
arbiter. The timing for BG input is relevant when the MPC862/857T/857DSL is selected to work with external bus
arbiter.
7
For part speeds above 50MHz, use 2ns for B17.
8
The D(0:31) and DP(0:3) input timings B18 and B19 refer to the rising edge of the CLKOUT in which the TA input
signal is asserted.
9
For part speeds above 50MHz, use 2ns for B19.
10
The D(0:31) and DP(0:3) input timings B20 and B21 refer to the falling edge of the CLKOUT. This timing is valid only
for read accesses controlled by chip-selects under control of the UPM in the memory controller, for data beats where
DLT3 = 1 in the UPM RAM words. (This is only the case where data is latched on the falling edge of CLKOUT.)
11
The timing B30 refers to CS when ACS = 00 and to WE(0:3) when CSNT = 0.
12
The signal UPWAIT is considered asynchronous to the CLKOUT and synchronized internally. The timings specified
in B37 and B38 are specified to enable the freeze of the UPM output signals as described in Figure 19.
13
The AS signal is considered asynchronous to the CLKOUT. The timing B39 is specified in order to allow the behavior
specified in Figure 22.
Table 7. Bus Operation Timings (continued)
Num
Characteristic
33 MHz
40 MHz
50 MHz
66 MHz
Unit
Min
Max
Min
Max
Min
Max
Min
Max
F
Freescale Semiconductor, Inc.
n
.
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