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DPC31 HW

Page 26 Version V 1.0

DPC31 HW Description

User_SSA_OK Cmd

(Read Operation):

000000 User_Ack

User_Ack

1..0

= 00

⇒

User_SSA_Finished

User_Ack

1..0

= 01

⇒

SSA_Conflict

User_Ack

1..0

= 11

⇒

Not_Allowed

User_Ack

1..0

= 10

⇒

not possible

Table 5.2-5:

Coding of User_SSA_OK Cmd

The acknowledgement ‘User_SSA_OK Cmd’ is a read access to a register cell with the corresponding codes

‘Not_Allowed’, ‘User_SSA_Finished’, or ‘SSA_Conflict’.

The SSA_State_Machine is reset also when the DPS is powered up -that is, after the user has transferred

‘MAC_Start’ in the request list- or the watchdog has expired in the mode ‘DP_Control’. If the SSA message

is repeated because the short acknowledgement was faulty on the bus, the MAC ignores it because it has

already accepted the new station address.

5.2.2 Set_Param, Prm (SAP61)

For this SAP, two exchange buffers of the same length are available. One buffer is integrated as the

indication buffer (MAC_Prm buffer) and the other is located as the User_Prm buffer in DPS buffer

management. The indication is always transferred to the user in the User_Prm buffer.

The DPS module accepts this request in any DPS mode (Wait_Prm, Wait_Cfg, Data_Ex). However, the

message has to have at least a length of >= 7 bytes; otherwise, it is ignored.

76543210Byte Name

0-5: Buffer Header

Lock_

Req

Unlock_

Req

Sync_

Req

Freeze_

Req

WD_

Res. Res. Res.

6: Station Status

7: WD_Fact_1

8: WD_Fact_2

9: MinTSDR

10: Ident_Number_High

11: Ident_Number_Low

12: Group_Ident

DPV1_

Enable

Failsafe res res res. WD_

Base

res res

13: DPV1_Status_1

(Spec_User_Prm_Byte)

14: DPV1_Status_2

15: DPV1_Status_3

16-249: Rem_Slave-Data

Figure 5.2-3:

Assignment in the Data Field of the PRM Indication Buffer

Byte 13 is permanently reserved for the DPC31 and

must not

be used for User Prm data.

The bytes 13 to 15 are reserved according to DPV1 and

should not

be used for User Prm data in order to

make a compatible change to DPV1 possible.

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