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| 型號： | CYNSE70064A |
| 廠商： | Cypress Semiconductor Corp. |
| 英文描述： | Search Engine |
| 中文描述： | 搜索引擎 |
| 文件頁數(shù)： | 117/127頁 |
| 文件大?。?/td> | 3275K |
| 代理商： | CYNSE70064A |
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CYNSE70064A
Document #: 38-02041 Rev. *E
Page 117 of 127
15.0
JTAG (1149.1) Testing
The CYNSE70064A supports the Test Access Port and Boundary Scan Architecture as specified in the IEEE JTAG standard
number 1149.1. The pin interface to the chip consists of five signals with the standard definitions: TCK, TMS, TDI, TDO, and
TRST_L.
Table 15-1
describes the operations that the test access port controller supports, and
Table 15-2
describes the TAP
Device ID Register.
Note
. To disable JTAG functionality, connect the TCK, TMS and TDI pins to V
DDQ
through a pull-up, and
TRST_L to ground through a pull-down.
Table 15-1. Supported Operations
Instruction
Type
SAMPLE/PRELOAD
Mandatory
Sample/Preload. This operation loads the values of signals going to and from I/O
pins into the boundary scan shift register to provide a snapshot of the normal
functional operation, and to initialize boundary scan.
EXTEST
Mandatory
External Test. This operation uses boundary scan values shifted in from TAP to
test connectivity external to the device.
BYPASS
Mandatory
This operation loads a single bit shift register between TDI and TDO and provides
a minimum-length serial path when no test operation is required
IDCODE
Optional
This operation selects the Identification register between TDI and TDO and allows
the “idcode” to be read serially through TDO.
CLAMP
Optional
This operation drives preset values onto the outputs of devices
HighZ
Optional
This operation leaves the device output pins in a high-impedance state.
Description
Table 15-2. TAP Device ID Register
Field
Revision
Range
[31:28]
Initial Value
0001
Description
Revision Number. This is the current device revision number. Numbers start
from 1 and increment by 1 for each revision of the device.
This is the part number for the device.
Manufacturer ID. This field is the same as the manufacturer ID used in the
TAP controller.
Least significant bit.
Part Number
MFID
[27:12]
[11:1]
0000 0000 0000 0001
000_1101_1100
LSB
[0]
1
Memoy
Network Line Interfaces
System Bus
NPoeso
Fabic
ASC
Engne
SRBank
Figure 14-1. Sample Switch/Router Using the CYNSE70064A Device
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相關(guān)代理商/技術(shù)參數(shù) |
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| CYNSE70064A-50BGC | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Search Engine |
| CYNSE70064A-66BG | 制造商:Cypress Semiconductor 功能描述: |
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| CYNSE70064A-83BGC | 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Search Engine |
| CYNSE70128 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Network Processing |
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