参数资料
型号: 89HPES16T4G2
厂商: Integrated Device Technology, Inc.
英文描述: 16-Lane 4-Port Gen2 PCI Express Switch
中文描述: 16巷4端口第二代的PCI Express开关
文件页数: 13/32页
文件大小: 305K
代理商: 89HPES16T4G2
13 of 32
September 4, 2007
IDT 89HPES16T4G2 Data Sheet
A
Figure 4 JTAG AC Timing Waveform
S ignal
S ymbol
Referenc e
Edge
Min
Max
Unit
T iming
Diagram
Referenc e
JTAG
JTAG_TCK
Tper_16a
none
50.0
ns
See Figure 4.
Thigh_16a,
Tlow_16a
10.0
25.0
ns
JTAG_TMS
1
,
JTAG_TDI
1.
The JTAG specification, IEEE 1149.1, recommends that JTAG_TMS should be held at 1 while the signal applied at JTAG_TRST_N
changes from0 to 1. Otherwise, a race may occur if JTAG_TRST_N is deasserted (going fromlow to high) on a rising edge of JTAG_TCK
when JTAG_TMS is low, because the TAP controller mght go to either the Run-Test/Idle state or stay in the Test-Logic-Reset state.
2.
The values for this symbol were determned by calculation, not by testing.
Tsu_16b
JTAG_TCK rising
2.4
ns
Thld_16b
1.0
ns
JTAG_TDO
Tdo_16c
JTAG_TCK falling
20
ns
Tdz_16c
2
20
ns
JTAG_TRST_N
Tpw_16d
2
none
25.0
ns
Table 12 JTAG AC Timing Characteristics
Tpw_16d
Tdz_16c
Tdo_16c
Thld_16b
Tsu_16b
Thld_16b
Tsu_16b
Tlow_16a
Tper_16a
Thigh_16a
JTAG_TCK
JTAG_TDI
JTAG_TMS
JTAG_TDO
JTAG_TRST_N
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