2 TAP State Handler

Handle TAP controller state changes according to IEEE 1149.1. More...

Defines
#define	TEST_LOGIC_RESET   0x00
#define	RUN_TEST_IDLE   0x01
#define	SELECT_DR_SCAN   0x02
#define	CAPTURE_DR   0x03
#define	SHIFT_DR   0x04
#define	EXIT1_DR   0x05
#define	PAUSE_DR   0x06
#define	EXIT2_DR   0x07
#define	UPDATE_DR   0x08
#define	SELECT_IR_SCAN   0x09
#define	CAPTURE_IR   0x0A
#define	SHIFT_IR   0x0B
#define	EXIT1_IR   0x0C
#define	PAUSE_IR   0x0D
#define	EXIT2_IR   0x0E
#define	UPDATE_IR   0x0F
#define	UNKNOWN_STATE   0x10
Functions
void	TapStateInit (void)
	TAP controller initialization.
void	TmsHighTransition (void)
	State transition with TMS set to high.
void	TmsLowTransition (void)
	State transition with TMS set to low.
int	TapStateChange (u_char state)
	Change TAP state.
void	TapStateInc (void)
	Increment the TAP state.
Variables
u_char	tapState
	Current state of the TAP controller.

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Detailed Description

Handle TAP controller state changes according to IEEE 1149.1.

The order of the defined TAP state codes is critical and should reflect the TAP state transistions.

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Define Documentation

#define CAPTURE_DR   0x03

TAP state. Definition at line 59 of file tapsm.h. Referenced by TapStateChange().

#define CAPTURE_IR   0x0A

TAP state. Definition at line 73 of file tapsm.h. Referenced by TapStateChange().

#define EXIT1_DR   0x05

TAP state. Definition at line 63 of file tapsm.h. Referenced by TapStateChange().

#define EXIT1_IR   0x0C

TAP state. Definition at line 77 of file tapsm.h. Referenced by TapStateChange().

#define EXIT2_DR   0x07

TAP state. Definition at line 67 of file tapsm.h. Referenced by TapStateChange().

#define EXIT2_IR   0x0E

TAP state. Definition at line 81 of file tapsm.h. Referenced by TapStateChange().

#define PAUSE_DR   0x06

TAP state. Definition at line 65 of file tapsm.h. Referenced by Execute(), ReShift(), and TapStateChange().

#define PAUSE_IR   0x0D

TAP state. Definition at line 79 of file tapsm.h. Referenced by Execute(), and TapStateChange().

#define RUN_TEST_IDLE   0x01

TAP state. Definition at line 55 of file tapsm.h. Referenced by Execute(), ReShift(), and TapStateChange().

#define SELECT_DR_SCAN   0x02

TAP state. Definition at line 57 of file tapsm.h. Referenced by TapStateChange().

#define SELECT_IR_SCAN   0x09

TAP state. Definition at line 71 of file tapsm.h. Referenced by TapStateChange().

#define SHIFT_DR   0x04

TAP state. Definition at line 61 of file tapsm.h. Referenced by Execute(), ReShift(), and TapStateChange().

#define SHIFT_IR   0x0B

TAP state. Definition at line 75 of file tapsm.h. Referenced by Execute(), and TapStateChange().

#define TEST_LOGIC_RESET   0x00

TAP state. Definition at line 53 of file tapsm.h. Referenced by Execute(), TapStateChange(), and TapStateInit().

#define UNKNOWN_STATE   0x10

Unknown TAP state, indicates an error. Definition at line 85 of file tapsm.h. Referenced by XsvfGetState().

#define UPDATE_DR   0x08

TAP state. Definition at line 69 of file tapsm.h. Referenced by TapStateChange().

#define UPDATE_IR   0x0F

TAP state. Definition at line 83 of file tapsm.h. Referenced by TapStateChange().

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Function Documentation

int TapStateChange (  u_char  state  )

Change TAP state. Moves the TAP (Test Access Port) controller of the target to the specified state. Trying to enter Exit2-DR or Exit2-IR from any other state except Pause-DR or Pause-IR resp. will result in an error. Parameters: state  Requested TAP controller state. Returns: Zero on success, otherwise an error code is returned. Definition at line 106 of file tapsm.c. References CAPTURE_DR, CAPTURE_IR, EXIT1_DR, EXIT1_IR, EXIT2_DR, EXIT2_IR, PAUSE_DR, PAUSE_IR, RUN_TEST_IDLE, SELECT_DR_SCAN, SELECT_IR_SCAN, SHIFT_DR, SHIFT_IR, tapState, TEST_LOGIC_RESET, TmsHighTransition(), TmsLowTransition(), UPDATE_DR, UPDATE_IR, and XE_ILLEGALSTATE. Referenced by Execute(), and ReShift().

void TapStateInc (  void   )

Increment the TAP state. This routine will be used by the caller to update the current TAP state, if the last shift included a state transition. Definition at line 273 of file tapsm.c. References tapState. Referenced by ReShift().

void TapStateInit (  void   )

TAP controller initialization. Must be called prior any other routine in this module. Definition at line 66 of file tapsm.c. References SET_TMS, tapState, and TEST_LOGIC_RESET. Referenced by Execute().

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