CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
103
3.6.2 Receiving Trace Message
The
µ
PD98413 has two 64-byte buffers (Accepted and Captured buffer) for each of J0 and J1 that store received
trace messages. Accepted buffer is able to access by the Management Interface, but Captured buffer is not. When
µ
PD98413 is received a new message, it is stored in Captured buffer, and then if Accepted buffer is not locked, the
received message is stored in Accepted buffer. Accepted buffer is able to lock, because if a message that is stored in
the Accepted buffer is not finished to read by the CPU, the read massage value is differ from received message value.
While the message stored to Accepted buffer, a new message is stored to the Captured buffer. The
µ
PD98413 also
has one 64-byte buffer storing expected trace message for each of J0 and J1.
Table 3-20 Register and bits related trace message receive
Register and Bit of Section
trace message
Classificati
on
Section (J0)
Path (J1)
R/W Outline
MDSOHR
register
J0SZ bit
MDPOHR
register
J1SZ bit
R/W
Selection of 16- or 64-byte length
Mode
MDSOHR
register
J0SYNC bit
MDPOHR
register
J1SYNC bit
R/W
Specifies whether set synchronization pattern is at the
beginning or end of message
BSEL bit
BSEL bit
R/W
Selection of J0 buffer or J1 buffer
BTYP bit
BTYP bit
R/W
Selection of Accepted buffer or Expected buffer
Buffer
select
TMBR
register
BADR bit
BADR bit
R/W
Set the offset address of the trace message buffer
Buffer lock
CMTMR
register
J0LOCK bit
J1LOCK bit
R/W
Indicated and sets to lock the Accepted buffer of the trace
message.
Buffer
Access
register
TMDR
register
BDAT bit
BDAT bit
R/W
Access to Expected Buffer or Accepted buffer,
Which to Access is setting by buffer select register
(TMBT).
J0PTN bit
J1PTN bit
R/W
Set the synchronous pattern of J0/J1 massage
TIM
detecting
pattern
setting
J0PTN
J1PTN
register
J0M bit
J1M bit
R/W
Set the mask value of the synchronous pattern.
Содержание NEASCOT-P65
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