參數(shù)資料
型號: AMDK86
英文描述: AMD K86 - AMD K86 Family BIOS and Software Tools Developers Guide
中文描述: AMD的K86 - AMD的K86系列BIOS和軟件工具開發(fā)人員指南
文件頁數(shù): 58/144頁
文件大?。?/td> 2179K
代理商: AMDK86
46
AMD-K5 Processor
AMD K86 Family BIOS and Software Tools Developers Guide
21062E/0—June 1997
Preliminary Information
EXTEST.
The EXTEST instruction permits circuits outside the
component package to be tested. A common use of the EXTEST
instruction is the testing of board interconnects. Boundary scan
register cells at output pins are used to apply test stimuli, while
those at input pins capture test results. Depending on the value
loaded into their control cells in the boundary scan register, the
I/O pins are established as input or output. Inputs to the core
logic retain the logic value set prior to execution of the
EXTEST instruction. Upon exiting EXTEST, input pins are
reconnected to the package pins.
SAMPLE/PRELOAD.
There are two functions performed by the
SAMPLE/PRELOAD instruction, as follows:
I
Capturing an instantaneous picture of the normal operation
of the device being tested. This function occurs if the
instruction is executed while the TAP controller is in the
Capture-DR state and causes the Boundary Scan Register to
sample the values present at the device pins.
Preloading data to the device pins to be driven to the board
by the EXTEST instruction. This function occurs if the
instruction is executed while the TAP controller is in the
Update-DR state and causes data to be preloaded to the
device pins from the Boundary Scan Register.
I
Table 16. Public TAP Instructions
Instruction
EXTEST
SAMPLE/PRELOAD
IDCODE
HIGHZ
ALL1
ALL0
Encoding
00000
00001
00010
00011
00100
00101
Register
BSR
BSR
DIR
BR
BR
BR
Description
As defined by the IEEE standard
As defined by the IEEE standard
As defined by the IEEE standard
As defined by the IEEE standard
Forces all outputs and bidirectionals High
Forces all outputs and bidirectionals Low
Accesses the Hardware Debug Tool (HDT)
See page 57
As defined by the IEEE standard
As defined by the IEEE standard
Undefined instruction encodings select the BYPASS
instruction
USEHDT
00110
HDTR
RUNBIST
BYPASS
00111
11111
BISTRR
BR
BYPASS
undefined
BR
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