參數資料
型號: MPC850EC
廠商: Motorola, Inc.
英文描述: Communications Controller Hardware Specifications
中文描述: 通信控制器的硬件規(guī)格
文件頁數: 50/68頁
文件大小: 384K
代理商: MPC850EC
50
MPC850 (Rev. A/B/C) Hardware Specifications
MOTOROLA
SCC in NMSI Mode Electrical Specifications
8.6
SCC in NMSI Mode Electrical Specifications
Table 18 provides the NMSI external clock timing.
Table 19 provides the NMSI internal clock timing.
Table 18. NMSI External Clock Timing
Num
Characteristic
All Frequencies
Unit
Min
Max
100
RCLKx and TCLKx frequency
1
(x = 2, 3 for all specs in this
table)
1
2
The ratios SyncCLK/RCLKx and SyncCLK/TCLKx must be greater than or equal to 2.25/1.
Also applies to CD and CTS hold time when they are used as an external sync signal.
1/SYNCCLK
ns
101
RCLKx and TCLKx width low
1/SYNCCLK +5
ns
102
RCLKx and TCLKx rise/fall time
15.00
ns
103
TXDx active delay (from TCLKx falling edge)
0.00
50.00
ns
104
RTSx active/inactive delay (from TCLKx falling edge)
0.00
50.00
ns
105
CTSx setup time to TCLKx rising edge
5.00
ns
106
RXDx setup time to RCLKx rising edge
5.00
ns
107
RXDx hold time from RCLKx rising edge
2
5.00
ns
108
CDx setup time to RCLKx rising edge
5.00
ns
Table 19. NMSI Internal Clock Timing
Num
Characteristic
All Frequencies
Unit
Min
Max
100
RCLKx and TCLKx frequency
1
(x = 2, 3 for all specs in this table)
1
2
The ratios SyncCLK/RCLKx and SyncCLK/TCLK1x must be greater or equal to 3/1.
Also applies to CD and CTS hold time when they are used as an external sync signals.
0.00
SYNCCLK/3
MHz
102
RCLKx and TCLKx rise/fall time
ns
103
TXDx active delay (from TCLKx falling edge)
0.00
30.00
ns
104
RTSx active/inactive delay (from TCLKx falling edge)
0.00
30.00
ns
105
CTSx setup time to TCLKx rising edge
40.00
ns
106
RXDx setup time to RCLKx rising edge
40.00
ns
107
RXDx hold time from RCLKx rising edge
2
0.00
ns
108
CDx setup time to RCLKx rising edge
40.00
ns
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