UM0434 datasheet(373/390 Pages) STMICROELECTRONICS

373 / 390 page

Nexus3 module

UM0434

374/391

Figure 82.

State diagram for single pin MSEO transfers

Note that the end message state does not contain valid data on

nex_mdo[n:0]. Also, it is not

possible to have two consecutive end packet messages. This implies the minimum packet

size for a variable length packet is 2x the number of

nex_mdo[n:0] pins. This ensures that a

false end-of-message state is not entered by emitting two consecutive 1s on

nex_mseo_b

before the actual end of message.

Figure 83 shows the state diagram for dual-pin MSEO transfers.

Table 273.

MSEO Pin(s) protocol

nex_mseo_b function

Single nex_mseo_b data

(serial)

Dual nex_mseo_b[1:0] data

Start of message

1–1–0

11–00

End of message

0–1–1–(more ones)

00 (or 01)–11–(more ones)

End of variable length packet

0–1–0

00–01

Message transmission

00s

Idle (no message)

11s

Normal

Transfer

nex_mseo_b=1

nex_mseo_b=0

nex_mseo_b=1

nex_mseo_b=0

nex_mseo_b=1

Not Allowed

End

Packet

Idle

MDO: Invalid

Stage

Message

End

Message

MDO: Invalid

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