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| 型号： | PowerPC 740 |
| 厂商： | IBM Microeletronics |
| 英文描述： | 32-Bit Embedded Microprocessor(32位精简指令集嵌入式微处理器) |
| 中文描述： | 32位嵌入式微处理器（32位精简指令集嵌入式微处理器） |
| 文件页数： | 22/48页 |
| 文件大小： | 608K |
| 代理商： | POWERPC 740 |
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Page 22
Version 1.02
12/8/99
PowerPC 740 and PowerPC 750 Microprocessor
CMOS 0.20
μ
m Copper Technology, PID-8p, PPC740L and PPC750L, dd3.2
IEEE 1149.1 AC Timing Specifications
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 Specifications (Independent of SYSCLK)
See Table “Recommended Operating Conditions,” on page 9 for operating conditions, C
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
4
spec obsolete, intentionally omitted
5
TRST assert time
25
—
ns
1
6
Boundary-scan input data setup time
4
—
ns
2
7
Boundary-scan input data hold time
16
—
ns
2
8
TCK to output data valid
4
20
ns
3, 5
9
TCK to output high impedance
3
19
ns
3, 4
10
TMS, TDI data setup time
0
—
ns
11
TMS, TDI data hold time
16
—
ns
12
TCK to TDO data valid
2.5
12
ns
5
13
TCK to TDO high impedance
3
9
ns
4
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
2
3
3
VM
TCK
VM
VM
Vm = 1.4 V for OVdd = 3.3 V., else Vm = OVdd/2
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