參數(shù)資料
型號: MCF5251CVM140
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 140 MHz, MICROPROCESSOR, PBGA225
封裝: LEAD FREE, MAPBGA-225
文件頁數(shù): 10/34頁
文件大小: 674K
代理商: MCF5251CVM140
Electrical Specifications
MCF5251 ColdFire Processor Data Sheet: Technical Data, Rev. 3
18
Freescale Semiconductor
4.5
BDM and JTAG Timing
Table 16 provides the BDM timing parameters.
Figure 5 provides the JTAG timing diagram and Table 17 provides the JTAG timing parameters.
Figure 5. JTAG Timing Diagram
1 Note that output data may go invalid before rising edge of the clock. To clock data in reliably, you need to sample data, for
example, 2 ns before rising edge of clock.
2 Timing figure given takes 50% margin for noise and uncertainty on pin capacitance. Simulated clock-to-data, not taking noise
effects into account is 2.7 ns.
Table 16. BDM Interface Timing Parameters
Characteristic
Min
Max
Units
Clock period for DSCLK clock
5T1
1 T denotes the CPU clock period. E.g. if the CPU is running at 100 MHz, T = 10 ns
ns
Set-up time DSI, BKPT, to DSCLK rising edge
4.0
ns
Hold time DSI, BKPT to DSCLK rising edge
T+ 4.0
ns
Propagation delay DSCLK rising edge to TDO/DSO change
3T
4T + 32
ns
TDI, TMS
TCK
J1
J2A
J4
J2B
J3A
J3B
J5
J6
J7
J1
J11
J9
J12
J10
Boundary Scan
Data Input
Boundary Scan
Data Output
TRST
TDO
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