KSZ9567R datasheet(126/233 Pages) MICROCHIP

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KSZ9567R

DS00002329E-page 126

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5.1.6.25

Timestamp Status and Control Register

This register is indexed by the Timestamp Unit Index Pointer value in bit 8 of the Global PTP Unit Index Register.

Address:

0x0550 - 0x0553

Size:

32 bits

Bits

Description

Type

Default

31:21

RESERVED

0x00

20:17

Number of Detected Event Count for Timestamp Input Unit

(TS_EVENT_DET_CNT)

Reports the number of detected events (either rising or falling edge) count. In

single mode, it can detect up to 15 events at any single unit. The pulse or

edges can be detected up to 25MHz. The pulse width can be measured by the

difference between consecutive timestamps in the same unit.

0000b

Number of Detected Event Count Overflow for Timestamp Input Unit

(TS_DET_EVENT_CNT_OVERFLOW)

1 = The detected events (either rising or falling edge) count has overflowed. In

cascade mode, only the tail unit will set this bit when overflow occurs. The

TS_EVENT_DET_CNT field will remain at 15 when overflow has occurred.

0 = The number of events (either rising or falling edge) count has not over-

flowed.

15:8

RESERVED

00000000b

Enable Rising Edge Detection (TS_RISING_EDGE_ENB)

1 = Enable rising edge detection

0 = Disable rising edge detection

R/W

Enable Falling Edge Detection (TS_FALLING_EDGE_ENB)

1 = Enable falling edge detection

0 = Disable falling edge detection

R/W

Tail Unit Indicator for Timestamp Input Unit Event in Cascade Mode

(TS_CASCADE_MODE_TAIL)

1 = This event timestamp input unit is the last unit of the chain in cascade

mode.

0 = This event timestamp input unit is not the last unit of the chain in cascade

mode.

R/W

4:2

RESERVED

00b

Select Upstream Timestamp Done Unit in Cascade Mode

(TS_CASCADE_MODE_ENB)

This bit selects the timestamps done input unit in cascade mode.

1 = Timestamp Unit 1

0 = Timestamp Unit 0

In the head unit, this should be set to “0” so that no upstream timestamp unit

will be input to the head unit.

R/W

Enable This Event Timestamp Input Unit in Cascade Mode

(TS_CASCADE_MODE_ENB)

1 = Enables this event timestamp input unit in cascade mode.

0 = Disables this event timestamp input unit in cascade mode.

R/W

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