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DPC31 HW

Page 30 Version V 1.0

DPC31 HW Description

User_New_Dout Cmd

(Read Operation):

0 0 0 0 U_Buffer_Cleared U_Buffer_State U_Buffer

U_Buffer

U_Buffer_State = 0

⇒

no new U_Buffer U_Buffer

1..0

=00

⇒

Buffer4

U_Buffer_State = 1

⇒

new U_Buffer U_Buffer

1..0

=01

⇒

Buffer1

U_Buffer_Cleared = 0

⇒

received data U_Buffer

1..0

=10

⇒

Buffer2

U_Buffer_Cleared = 1

⇒

substitute values U_Buffer

1..0

=11

⇒

Buffer3

User_Dout_Buffer State

(Read Operation)

F_Buffer

U_Buffer

N_Buffer

D_Buffer

F/N-Buffer

1..0

= 00

⇒

Nil U-Buffer

1..0

= 00

⇒

Buffer4 D-Buffer

1..0

=00

⇒

not

possible

F/N-Buffer

1..0

= 01

⇒

Buffer1 U-Buffer

1..0

= 01

⇒

Buffer1 D-Buffer

1..0

= 01

⇒

Buffer1

F/N-Buffer

1..0

= 10

⇒

Buffer2 U-Buffer

1..0

= 10

⇒

Buffer2 D-Buffer

1..0

= 10

⇒

Buffer2

F/N-Buffer

1..0

= 11

⇒

Buffer3 U-Buffer

1..0

= 11

⇒

Buffer3 D-Buffer

1..0

= 11

⇒

Buffer3

Table 5.2-8:

Coding of User_New_Dout Cmd, User_Dout_Buffer State

With the read operation ‘User_Din_Buffer State’, the user receives the current buffer assignment without the

buffer being exchanged!

User_New_Din Cmd

(Read Operation):

0 0 0 0 0 0 U_Buffer

U_Buffer

1..0

=00

⇒

not possible

U_Buffer

1..0

= 01

⇒

Buffer1

U_Buffer

1..0

= 10

⇒

Buffer2

U_Buffer

1..0

= 11

⇒

Buffer3

User_Din_Buffer State

(Read Operation)

F_Buffer

U_Buffer

N_Buffer

D_Buffer

F/N-Buffer

1..0

= 00

⇒

Nil U/D-Buffer

1..0

=00

⇒

not

possible

F/N-Buffer

1..0

= 01

⇒

Buffer1 U/D-Buffer

1..0

= 01

⇒

Buffer1

F/N-Buffer

1..0

= 10

⇒

Buffer2 U/D-Buffer

1..0

= 10

⇒

Buffer2

F/N-Buffer

1..0

= 11

⇒

Buffer3 U/D-Buffer

1..0

= 11

⇒

Buffer3

Table 5.2-9:

Coding of User_New_Din Cmd and User_Din_Buffer State

At startup, the DP_SM goes to ‘Data_Exchange’ only after a positive user acknowledgement of

User_Cfg_OK cmd’ has followed a Check_Config message, and additionally, the first valid Din buffer was

made available in ‘N’ with the ‘User_New_Din cmd’.

DPS_User Watchdog:

After power-up (‘Data_Exchange’ mode), it is possible that the DPC31 continuously replies to

Write_Read_Data messages without the user fetching the received Dout buffers or making new Din buffers

available. If the user processor should “hang”, the master would not notice it. For that reason, a ‘DPS_User

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