CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
80
3.4.2 Detection of Alarm and Failure
Table 3-14 lists the failures and alarms monitored by the
µ
PD98413. If any of these events has been detected,
the following actions are taken.
<1>
The corresponding bit of the interrupt cause register is set.
The CPU identifies the event that has occurred by reading the register.
<2>
An interrupt signal is asserted active to report the host.
Whether an interrupt signal corresponding to each event is asserted active (mask, unmask) can be selected.
<3>
The corresponding pin is asserted active.
If an event occurs, the corresponding alarm output pin (RALM pins) goes high to report the external
peripheral device.
Table 3-14. Alarms and Failures (1/4)
LOS (Loss Of Signal)
Receive signal lost status
Detection: See section 3.1.2 (Table 3-2)
Termination: See section 3.1.2 (Table 3-2)
OOF (Out Of Frame)
Frame non-synchronization
Detection: If a frame synchronization pattern cannot be detected
α
times in a row at the positions of the A1 and A2 bytes.
Termination: If a frame synchronization pattern is detected
δ
times in a row.
*
α
= 3, 4, 5, or 6,
δ
= 2, 3, or 4. These values can be selected by using the OOFD[1:0] and OOFT[1:0] bits of the MDSOHR
register. In the default mode,
α
= 4 and
δ
= 2.
LOF (Loss Of Frame)
Frame lost status
Detection: If OOF status lasts for T ms
Termination: If not OOF status lasts for T ms
* T = 3 ms or 0 ms. This can be selected by using the LOFDT bit of the MDSOHR register.
In the default mode, T = 3 ms. When T = 0 ms, the detection/clearing condition is the same as that of OOF.
Содержание UPD98413
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