UM10503
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User manual
Rev. 1.3 — 6 July 2012
703 of 1269
NXP Semiconductors
UM10503
Chapter 26: LPC43xx Ethernet
26.6.24 Target time nanoseconds register
This register contains the higher 32 bits of time to be compared with the system time for
interrupt event generation.
26.6.25 System time higher words seconds register
This register contains the most significant 16-bits of the time stamp seconds value.
26.6.26 Time stamp status register
This register contains the PTP status. All bits except Bits[27:25] gets cleared after this
register is read by the host.
The register field can be read by the application (Read), can be set to 1 by the core on a
certain internal event (Self Set), and is automatically cleared to 0 on a register read. A
register write of 0 has no effect on this field.
Table 557. Target time nanoseconds register (TARGETNANOSECONDS, address 0x4001
0720) bit description
Bit
Symbol
Description
Reset
value
Access
30:0
TSTR
Target time stamp low
This register stores the time in (signed) nanoseconds.
When the value of the Time Stamp matches the Target
time stamp registers (both), the MAC will generate an
interrupt if enabled. (This value should not exceed
0x3B9A_C9FF when TSCTRLSSR is set in the time
stamp control register.)
0
RO
31
-
Reserved.
-
-
Table 558. System time higher words seconds register (HIGHWORD, address 0x4001 0724)
bit description
Bit
Symbol
Description
Reset
value
Access
15:0
TSHWR
Time stamp higher word
Contains the most significant 16-bits of the time stamp
seconds value. The register is directly written to initialize
the value. This register is incremented when there is an
overflow from the 32-bits of the System Time - Seconds
register.
0
R/W
31:16
-
Reserved.
-
-