USB Type-C™ / USB Power Delivery interface (UCPD) RM0444
1318/1390 RM0444 Rev 5
The BIST test data packet frame format is shown in the following figure.
Figure 410. BIST test data frame
This is a fixed length test data pattern. In reality the only aspect that marks its difference
from the general packet format already shown in Figure 407: Packet format is the contents
of the Header. As UCPD receives the Tx Header contents via programming (it is simply
viewed as part of the payload), it is only this programming (and not the block’s behaviour)
that differentiates the general packet from the BIST Test Data packet.
BIST Carrier Mode 2
When required, this BIST test mode sends an alternating pattern of 1010 that is continually
repeated. As this mode is intended for signal analysis it is stable condition with (in V1.0 of
the USB PD specification) no defined length. Starting from V1.1 of the USB PD
specification, the protocol layer defines a counter that indicates when to exit this mode.
The way to quit the infinite 1010 sequence (according to requirements of the USB PD
specification) is to disable the UCPD peripheral via the UCPDEN bit.
Figure 411. BIST Carrier Mode 2 frame
MSv45542V2
Preamble
(training for receiver)
SOP*
(start of packet)
BIST test data
(192 bits)
Legend:
CRC
EOP
(end of packet)
...
Header
Data objects = 7
BIST Test Data
BDO
...
Provided by the physical layer, not 4b5b-encoded
Provided by the physical layer, 4b5b-encoded
Provided by the protocol layer, 4b5b-encoded
MSv45543V2
Preamble
(training for receiver)
SOP*
(start of packet)
Legend:
Provided by the physical layer, not 4b5b-encoded
Provided by the physical layer, 4b5b-encoded
10101010101010101010……
(repeated until UCPD is disabled)
UCPDEN = 0
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