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P5040/P5020 Reference Design Board User Guide, Rev. 0
16
Freescale Semiconductor
Architecture
5.1.4
Support for IEEE Std 1588
™
Protocol
The reference board supports the P5040/P5020 IEEE® 1588
precision time protocol (PTP) as shown in
. This facility works in tandem with an Ethernet controller to timestamp incoming packets.
Figure 9. IEEE® 1588 Interface to Reference Board Symmetricon Riser Connector
5.1.5
Serial Interfaces
This figure shows overall connections of RS-232, eSPI, and eSDHC/eMMC interfaces.
TX >
P5040/P5020
STMP_TX/RX[1:2]
CLKIN
XTALOSC
125.000 MHz
±25 ppm
1588
CLKOUT
TRIGIN[1:2]
ALARMOUT[1:2]
S
y
mmetr
icon
Riser Con
nector
PULSEOUT[1:2]