UM0434 datasheet(374/390 Pages) STMICROELECTRONICS

374 / 390 page

UM0434

Nexus3 module

375/391

Figure 83.

Dual-Pin MSEO transfers

The dual-pin MSEO option is more robust than the single-pin option. Termination of the

current message may immediately be followed by the start of the next message on

consecutive clocks. An extra clock to end the message is not necessary as with the one

MSEO pin option. The dual-pin option also allows for consecutive end packet states. This

can be an advantage when small, variable sized packets are transferred.

Note:

The end message state may also indicate the end of a variable-length packet as well as the

end of the message when using the dual-pin option.

12.12

Rules for output messages

e200z3-based class 3–compliant embedded processors must provide messages through

the auxiliary port in a consistent manner as described below:

●

A variable-length packet within a message must end on a port boundary.

●

A variable-length packet may start within a port boundary only when following a fixed-

length packet. If two variable-length packets end and start on the same clock, it is

impossible to know which bit is from the last packet and which bit is from the next

packet.

●

Whenever a variable-length packet is sized such that it does not end on a port

boundary, it is necessary to extend and zero-fill the remaining bits after the highest

order bit so that it can end on a port boundary.

Normal

Transfer

End

Message

nex_mseo_b[1:0]=11

nex_mseo_b[1:0]=00

nex_mseo_b[1:0]=01

[1:

0]=

nex_mseo_b[1:0]=00

nex_mseo_b[1:0]=11

nex_mseo_b[1:0]=01

End

Packet

nex

_ms

eo_

b[1

:0]=

nex_mseo_b[1:0]=11

nex_mseo_b[1:0]=10

Start

Message

nex_mseo_b[1:0]=10

nex_mseo_b[1:0]=01

Idle

MDO: Invalid

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