參數(shù)資料
型號: KMPC870ZT66
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Hardware Specifications
中文描述: 硬件規(guī)格
文件頁數(shù): 23/92頁
文件大?。?/td> 1499K
代理商: KMPC870ZT66
MPC885/MPC880 Hardware Specifications, Rev. 3
23
Freescale Semiconductor
Bus Signal Timing
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
TBD
TBD
TBD
ns
1
For part speeds above 50 MHz, use 9.80 ns for B11a.
2
The timing required for BR input is relevant when the MPC885/880 is selected to work with the internal bus arbiter.
The timing for BG input is relevant when the MPC885/880 is selected to work with the external bus arbiter.
3
For part speeds above 50 MHz, use 2 ns for B17.
4
The D(0:31) input timings B18 and B19 refer to the rising edge of the CLKOUT in which the TA input signal is asserted.
5
For part speeds above 50 MHz, use 2 ns for B19.
6
The D(0:31) 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 user-programmable machine (UPM) in the memory
controller, for data beats where DLT3 = 1 in the RAM words. (This is only the case where data is latched on the falling
edge of CLKOUT.)
7
The timing B30 refers to CS when ACS = 00 and to WE(0:3) when CSNT = 0.
8
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 20
.
9
The AS signal is considered asynchronous to the CLKOUT. The timing B39 is specified in order to allow the behavior
specified in
Figure 23
.
Table 9. Bus Operation Timings (continued)
Num
Characteristic
33 MHz
40 MHz
66 MHz
80 MHz
Unit
Min
Max
Min
Max
Min
Max
Min
Max
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