JPS62162147A - Data processor - Google Patents

Abstract

PURPOSE:To shorten a time necessary for a scan-path operation checking by providing function to check the abnormality of the scan-path and of a controlling means and a function to shift out to an object register. CONSTITUTION:A switching part 12 is so set by a command from the controlling part 11 that a shift-out-data from the scan-path 30 is outputted. Then the shift data held in the part 11 is sequentially shifted in to an identification code holding means 31 then to an object register 32. The data shifted out from the register 32 goes through the switching part 12, and is returned to the part 11. Thereafter, an identification code generated by means of scan-path selection in the part 11, is shifted in to the means 31. At the same time, the said code is transferred to a comparing part 13. If both identification codes coincide with each other, the coincidence shows that the controlling means 10 and the scan-path 30 are operating normally.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data processing device including a plurality of scan paths and a control means for controlling shift-in/out operations of the plurality of scan paths.

[Conventional technology]

The conventional data storage device requires 70 flips.

The control means includes a plurality of scan paths connected in cascade and a control means for controlling shift-in/out operations of the plurality of scan paths, and the control means transfers data to registers, flip-flops, etc. included in each scan path. Writing or reading data from them is performed by shifting shift-in data into the scan path, shifting out from the scan path, and taking out shift-out data for maintenance or diagnosis.

4 on the selected scan path to check the normality of the cloud operation.
1i? A certain pattern was scanned in, then scanned out, and the scan-in data and scan-out data were compared. That is, in order to confirm the scan-in-out operation, it is necessary to perform a scan-in operation and a scan-out operation.

For this reason, as data processing equipment becomes larger, the number of scan paths and the number of flip-flops included in the scan paths tend to increase, and it takes a lot of time to check scan-in-out operation. Then there was a problem.

[Means for solving problems]

In the data processing device of the present invention, the data processing device includes a plurality of scan paths and a control means for controlling shift-in/out operations of the plurality of scan paths, wherein the plurality of scan paths is 4! ! r, scan-in 1111i VCC scan path has an identification code holding means for holding a unique identification code of the scan path, and the control means controls the scan-in 1111i when transferring the shift-in-out date j1 of each scan path.

Transmit the identification code following each scan-in data (
- The identification code sent back from the identification code holding means is compared with the identification code to be held in the identification code holding means.

〔Example〕 Next, one embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The data processing device shown in FIG. 1 has 20 to 50 scan paths.
and control means 10 for controlling all shift-in-out operations.

The control means 10 includes a control section 11 and scan paths 20 to 5.
It consists of a switching section 12 that selects any of the shift-out data from 0 based on an instruction from the control section 11, and a comparison section 13.

Each of the scan paths 20-50 is composed of purpose registers 22-52 which are originally built into the data processing apparatus, such as registers and flip-flops, and identification code holding means 21-51 which hold identification codes.

The operation of each part will be explained below.

The control unit 11 of the control means 10 selects In, Taku\S
ζ<s, e.g., t shifts into scan path 30.

When shifting in data, first, the switching unit 12 is set to output shift-out data from the scan path 3° according to an instruction from the control unit 11. The data is sequentially shifted in to the identification code holding means 31, from the identification code holding means 31 to the target register 32, and then shifted out from the target register 32 (17), and the data is returned to the control unit 11 through the switching unit 12. Ru.

Thereafter, the identification code generated by the scan path selection VcL in the control unit 11 (that is, the identification code exclusive to each scan path) is shifted into the identification code holding means 31.
Ru. At the same time, the comparison unit 1
Sent to 3. Further, the identification code held in the identification code holding means 31 via the purpose register 32 is sent to υ13 through the switching unit 12, and is compared with the generated identification code described above. If the comparison result side identification codes match, it means that the control means 10 and the scan path 30 are operating normally. Well, this health check and writing and reading data to and from the destination register can be constructed into a series of shift-in-out operations (the time of which is equal to the time of a shift-in or shift-out operation in a conventional device). This reduces the time to 172 seconds compared to the conventional method. It is preferable that the identification code pattern excludes a pattern in which all bits are 0 and all bits are 1.

〔Effect of the invention〕

Above explanation 1. Specifically, the present invention provides an identification code holding means for holding an exclusive identification code in the scan path, in addition to a purpose register consisting of a register, a flip-flop, etc., which is originally built into the data processing device, on the shift-in side. and comparing all the identification codes shifted in to the identification code holding means and the identification codes shifted out from the identification code holding means in a series of shift-in/out operations under the control of the shift-in/out control means. In addition, the normality of the scan path and the normality of the control child stage can be confirmed by performing a shift-out operation to the target register at the same time as checking the normality of the scan path and the normality of the control means. 7) i-T: @XP This has the effect of shortening the time to check the yan pass operation.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic side of the present invention. 10... Control means, 11... Control section,
12...Switching section, 13...Comparison section, 2
0.30.40.50...Scan path, 21
．． 31.41.51...Identification code holding means,
22.32.42.52... Purpose register. Agent Patent Attorney Susumu Uchihara '1f5t
figure

Claims (1)

[Claims] In a data processing device comprising a plurality of scan paths and a control means for controlling shift-in/out operations of the plurality of scan paths, each of the plurality of scan paths has an identification code unique to the scan path on the scan-in side. The control means includes an identification code holding means for holding an identification code, and the control means transfers the identification code following each scan-in data when transferring shift-in-out data of each scan path, and the control means transfers the identification code following each scan-in data, and the identification code sent back from the identification code holding means. and an identification code to be held in the identification code holding means.