Cypress CY7C1556V18 TAP Controller State Diagram, State diagram for the TAP controller follows.12

CY7C1541V18, CY7C1556V18

CY7C1543V18, CY7C1545V18

The state diagram for the TAP controller follows.[12]

TAP Controller State Diagram

1

0

TEST-LOGIC RESET

0

TEST-LOGIC/ IDLE

1		1	1
	SELECT		SELECT
	DR-SCAN		IR-SCAN
	0		0
	1		1

CAPTURE-DR		CAPTURE-IR
0		0
SHIFT-DR	0	SHIFT-IR	0
1		1
EXIT1-DR	1	EXIT1-IR	1
0		0
PAUSE-DR	0	PAUSE-IR	0
1		1
0		0
EXIT2-DR		EXIT2-IR
1		1
UPDATE-DR		UPDATE-IR
1		1
0		0

Note

12. The 0/1 next to each state represents the value at TMS at the rising edge of TCK.

Document Number: 001-05389 Rev. *F Page 14 of 28

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