dp83630sqx National Semiconductor Corporation, dp83630sqx Datasheet - Page 87

• Manufacturer Part Number: dp83630sqx
• Description: Precision Phyter - Ieee 1588 Precision Time Protocol Transceiver
• Manufacturer: National Semiconductor Corporation

15:11
10:8
Bit
7:6
4:2
14.5.11 PTP Event Status Register (PTP_ESTS), Page 4
This register provides Status for the Event Timestamp unit. Reading this register provides status for the next Event Timestamp
contained in the Event Data Register. If this register is 0, no Event Timestamp is available in the Event Data Register. Reading
this register will automatically move to the next Event in the queue.
5
1
0
EVNTS_MISSED
EVNT_TS_LEN
MULT_EVNT
EVENT_DET
RESERVED
EVNT_NUM
EVNT_RF
Bit Name
TABLE 60. PTP Event Status Register (PTP_ESTS), address 0x1E
000, RO/SC
000, RO/SC
0000 0, RO
00, RO/SC
0, RO/SC
0, RO/SC
0, RO/SC
Default
Reserved: Writes ignored, Read as 0
Event Missed:
Indicates number of events have been missed prior to this timestamp for the
EVNT_NUM indicated. This count value will stick at 7 if more than 7 events are
missed.
Event Timestamp Length:
Indicates length of the Timestamp field in 16-bit words minus 1. Although all fields
are available, this indicates how many of the fields contain data different from the
previous Event Timestamp. This allows software to avoid reading more significant
fields if they have not changed since the previous timestamp. This field is valid
for both single and multiple events. The following shows the number of least
significant fields which have new data for each setting of TS_LENGTH:
00 : One 16-bit field is new (Timestamp_ns[15:0])
01 : Two 16-bit fields are new
10 : Three 16-bit fields are new
11 : All four 16-bit fields are new
Event Rise/Fall direction:
Indicates whether the event is a rise or falling event. If the MULT_EVNT bit is set
to 1, this bit indicates the Rise/Fall direction for the event indicated by
EVNT_NUM.
0 = Falling edge detected
1 = Rising edge detected
Event Number:
Indicates Event Timestamp Unit which detected an event. If the MULT_EVNT bit
is set to 0, this indicates the lowest event number captured. If events have been
missed prior to this timestamp, it indicates the lowest event number captured
which had at least one missed event.
Multiple Event Detect:
Indicates multiple events were detected at the same time. If multiple events are
detected, an extended event status field is available as the first data read from
the Event Data Register.
0 = Single event detected
1 = Multiple events detected
PTP Event Detected:
Indicates an Event has been detected by one of the Event Timestamp Units.
87
Description
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