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参数资料
| 型号： | MPC853TZT66 |
| 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： | 14/88页 |
| 文件大小： | 1185K |
| 代理商： | MPC853TZT66 |
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MPC853T Hardware Specification, Rev. 1
Freescale Semiconductor
21
Bus Signal Timing
B37
UPWAIT valid to CLKOUT falling edge 9
(MIN = 0.00
× B1 + 6.00)
6.00
—
6.00
—
6.00
—
6.00
—
ns
B38
CLKOUT falling edge to UPWAIT valid 9
(MIN = 0.00
× B1 + 1.00)
1.00
—
1.00
—
1.00
—
1.00
—
ns
B39
AS valid to CLKOUT rising edge 10
(MIN = 0.00
× B1 + 7.00)
7.00
—
7.00
—
7.00
—
7.00
—
ns
B40
A(0:31), TSIZ(0:1), RD/WR, BURST,
valid to CLKOUT rising edge
(MIN = 0.00
× B1 + 7.00)
7.00
—
7.00
—
7.00
—
7.00
—
ns
B41
TS valid to CLKOUT rising edge (setup
time) (MIN = 0.00
× B1 + 7.00)
7.00
—
7.00
—
7.00
—
7.00
—
ns
B42
CLKOUT rising edge to TS valid (hold
time) (MIN = 0.00
× B1 + 2.00)
2.00
—
2.00
—
2.00
—
2.00
—
ns
B43
AS negation to memory controller
signals negation (MAX = TBD)
—TBD
ns
1
If the rate of change of the frequency of EXTAL is slow (that is, it does not jump between the minimum and maximum
values in one cycle) or the frequency of the jitter is fast (that is, it does not stay at an extreme value for a long time)
the maximum allowed jitter on EXTAL can be up to 2%.
2
For part speeds above 50 MHz, use 9.80 ns for B11a.
3
The timing required for BR input is relevant when the MPC853T is selected to work with the internal bus arbiter. The
timing for BG input is relevant when the MPC853T is selected to work with the external bus arbiter.
4
For part speeds above 50 MHz, use 2 ns for B17.
5
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.
6
For part speeds above 50 MHz, use 2 ns for B19.
7
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.
8
The timing B30 refers to CS when ACS = 00 and to WE(0:3) when CSNT = 0.
9
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 18.
10 The AS signal is considered asynchronous to the CLKOUT. The timing B39 is specified in order to allow the behavior
specified in Figure 21.
Table 9. Bus Operation Timings (continued)
Num
Characteristic
33 MHz
40 MHz
50 MHz
66 MHz
Unit
Min
Max
Min
Max
Min
Max
Min
Max
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