UM0434 datasheet(376/390 Pages) STMICROELECTRONICS

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UM0434

Nexus3 module

377/391

T0 and S0 are the least significant bits, where Tx = TCODE number (fixed); Sx = source processor (fixed); Ix =

number of instructions (variable); Ax = unique portion of the address (variable).

T0 and S0 are the least significant bits, where Tx = TCODE number (fixed); Sx = source processor (fixed); Ix =

number of instructions (variable); Ax = unique portion of the address (variable).

Table 278 shows examples of direct branch messages: one with 2 MDO/1 MSEO, and one

with 8 MDO/2 MSEO.

Table 275.

Indirect branch message example (2 MDO/1 MSEO)

Clock

nex_mdo[1:0]

nex_mseo_b

State

Idle (or end of last message)

1T1

Start message

2T3

Normal transfer

3T5

Normal transfer

4S1

Normal transfer

5S3

Normal transfer

6I1

Normal transfer

7I3

Normal transfer

8I5

End packet

9A1

Normal transfer

End packet

During clock 12, the

nex_mdo[n:0] pins are

ignored in the single-MSEO case.

End message

Start message

Table 276.

Indirect branch message example (8 MDO/2 MSEO)

Clock

nex_mdo[7:0]

nex_mseo_b[1:0]

State

XXXXXXXX

Idle (or end of last

message)

T5T4T3T2T1T0

Start message

I5I4I3I2I1I0

End packet

A7A6A5

A4A3A2A1A0

End packet/end message

T5T4T3T2T1T0

Start message

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