NEC UPD98413 User Manual page 108

(2) Monitoring receive trace message
(a) Detecting J0 Section Trace Identifier Unstable (Section TIU)
Whether the 16- or 64-byte section trace message stored in the J0 byte is received stably is checked. If the
receive message differs from the previous message, the internal counter is incremented (+1). When the
value of the counter reaches eight or five (set to the STIUD bit of the MDSOHR register), the status is
indicated as Section TIU. This status is cleared if three or five (set to the STIUT bit of the MDSOHR register)
messages of the same contents have been received in succession. At the same time, the internal counter is
also reset.
(b) Detecting J0 Section Trace Identifier Mismatch (Section TIM)
Whether the 16- or 64-byte section trace message stored in the J0 byte is the expected message is checked.
If the message stored to the J0 message buffer differs from the expected message (set the expected
massage to Expected buffer), the µ PD98413 detects the Path TIM.
conditions are as follows.
Detection: If the mPD98413 received same J0 massage three or five times (set to the STIMDT bit of the
MDSOHR register) continuously, and that message is differ from expected massage..
Termination: If the mPD98413 received same J0 massage three or five times (set to the STIMDT bit of the
MDSOHR register) continuously, and that message equal to expected massage.
When the µ PD98413 detects the Section TIM, the status is indicated as the Section TIM in the DSLER
register.
(c) Detecting J1 Path Trace Identifier Unstable (Path TIU)
Whether the 16- or 64-byte section trace message stored in the J1 byte is received stably is checked. If the
message stored to the J1 message buffer differs from the previous message, the internal counter is
incremented (+1). When the value of the counter reaches five or eight (set to the PTIUD bit of the MDPOHR
register), the status is indicated as Path TIU. This status is cleared if three or five (set to the PTIUT bit of the
MDPOHR register) messages having the same contents are received in succession. At the same time, the
internal counter is also reset.
(d) Detecting J1 Path Trace Identifier Mismatch (Path TIM)
Whether the 16- or 64-byte section trace message stored in the J1 byte is the expected message is checked.
If the message stored to the J1 message buffer differs from the expected message, the µ PD98413 detects
the Path TIM. The detection and termination conditions are as follows.
Detection: If the mPD98413 received same J1 massage three or five times (set to the PTIMDT bit of the
MDPOHR register) continuously, and that message is differ from expected massage..
Termination: If the mPD98413 received same J1 massage three or five times (set to the PTIMDT bit of the
MDPOHR register) continuously, and that message equal to expected massage.
When the µ PD98413 detects the Path TIM, the status is indicated as J1 Path TIM in the DPPER register.
108
CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
The detection and termination
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