CYD02S36V/36VA

Document Number: 38-06076 Rev. *J

Page 10 of 28

IEEE 1149.1 Serial Boundary Scan (JTAG)[18]

The FLEx36 family devices incorporate an IEEE 1149.1 serial

boundary scan test access port (TAP). The TAP controller

functions in a manner that does not conflict with the operation of

other devices using 1149.1-compliant TAPs. The TAP operates

using JEDEC-standard 3.3V IO logic levels. It is composed of

three input connections and one output connection required by

the test logic defined by the standard.

Performing a TAP Reset

edges of TCK. This reset does not affect the operation of the

devices, and may be performed while the device is operating. An

MRST must be performed on the devices after power up.

Performing a Pause/Restart

When a SHIFT-DR PAUSE-DR SHIFT-DR is performed the scan

chain outputs the next bit in the chain twice. For example, if the

value expected from the chain is 1010101, the device outputs a

11010101. This extra bit causes some testers to report an

erroneous failure for the devices in a scan test. Therefore the

tester must be configured to never enter the PAUSE-DR state.

H

H

L

H

11

0s

1

0

1

0

1

01

00

Xs

1

X

0

X

0

X0

11

Xs

1

X

1

X

1

X1

00

Xs

1

X

0

X

0

X0

Masked Address

Unmasked Address

Mask

Register

bit-0

Address

Counter

bit-0

CNTINT

Example:

Load

Counter-Mask

Register = 3F

Load

Address

Counter = 8

Max

Address

Register

Max + 1

Address

Register

Figure 3. Programmable Counter-Mask Register Operation[17]

Table 4. Identification Register Definitions

Instruction Field

Value

Description

Revision number (31:28)

0h

Reserved for version number.

Cypress device ID (27:12)

C001h

Defines Cypress part number for CYD02S36V/36VA

Cypress JEDEC ID (11:1)

034h

Allows unique identification of the DP family device vendor.

ID register presence (0)

1

Indicates the presence of an ID register.

Notes

17. The “X” in this diagram represents the counter upper bits.

18. Boundary scan is IEEE 1149.1-compatible. See “Performing a Pause/Restart” for deviation from strict 1149.1 compliance.

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