参数资料
型号: IBM25EMPPC740LDBF4660
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 466 MHz, RISC PROCESSOR, CBGA255
封装: 21 X 21 MM, 1.27 MM PITCH, CERAMIC, BGA-255
文件页数: 17/50页
文件大小: 600K
代理商: IBM25EMPPC740LDBF4660
Page 20
Version 1.51
PowerPC 740 and PowerPC 750 Datasheet
5/20/99
PowerPC 740 and PowerPC 750 Embedded Microprocessor
IBM CMOS 0.20 um Copper Technology EMPPC740L and EMPPC750L
IEEE 1149.1 AC Timing Specications
The table below provides the IEEE 1149.1 (JTAG) AC timing specifications as defined in Figure 9, Figure 10,
Figure 11, and Figure 12. The five JTAG signals are; TDI, TDO, TMS, TCK, and TRST.
JTAG AC Timing Specications (Independent of SYSCLK)
L = 50pF.
Num
Characteristic
Min
Max
Unit
Notes
TCK frequency of operation
0
25
MHz
1
TCK cycle time
40
ns
2
TCK clock pulse width measured at 1.4V
15
ns
3
TCK rise and fall times
0
2
ns
4
spec obsolete, intentionally omitted
5
TRST assert time
25
ns
6
Boundary-scan input data setup time
4
ns
7
Boundary-scan input data hold time
16
ns
8
TCK to output data valid
4
20
ns
9
TCK to output high impedance
3
19
ns
10
TMS, TDI data setup time
0
ns
11
TMS, TDI data hold time
15
ns
12
TCK to TDO data valid
2.5
12
ns
13
TCK to TDO high impedance
3
9
ns
Note:
1. TRST is an asynchronous level sensitive signal. Guaranteed by design.
2. Non-JTAG signal input timing with respect to TCK.
3. Non-JTAG signal output timing with respect to TCK.
4. Guaranteed by characterization and not tested.
5. Minimum spec guaranteed by characterization and not tested.
Figure 9. JTAG Clock Input Timing Diagram
1
2
3
VM = Midpoint Voltage (1.4V)
VM
TCK
VM
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