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DPC31 HW

Page 24 Version V 1.0

DPC31 HW Description

5.2 DPS Module, Description of the Interface

DPS is enabled in the param register with ‘DP_Mode=1’, and started in the Instruction_Queue with the MAC

request ‘MAC_Start’. The user can disable the SAP55 (Set_Slave_Address).

The DPS protocol is integrated completely into the DPC31. All other DP SAPs are always enabled except for

the following: default SAP, SAP 56, SAP57, and SAP58. The remaining four SAPs are enabled only when

the ‘Data_Exchange’ mode is entered.

‘U’‘F’‘N’‘D ’

Dout Buffer

‘U’‘F’‘N’‘D ’

Din Buffer

Default_SAP:

Ind_Buffer Ptr

Resp_Buffer Ptr

SAP57:

Resp_Buffer_Ptr

SAP56:

Resp_Buffer_Ptr

SAP58:

Ind_Buffer Ptr

SAP60:

Resp_Buffer_Ptr

SAP59:

Resp_Buffer_Ptr

SAP55:

Ind_Buffer Ptr

SAP61:

Ind_Buffer Ptr

SAP62:

Ind_Buffer Ptr

‘U’‘D ’

U_Diag Buffer

Buffer Arrangement

‘U’‘D ’

U_GCfg Buffer

‘U’‘D ’

U_SSA Buffer

‘U’‘D ’

U_Prm Buffer

‘U’‘D ’

U_Cfg Buffer

‘D’

MAC_GC Buffer

‘C’

Figure 5.2-1:

DPS Buffer Structure

Figure 5.2-1 shows the DPS buffer structure. The buffers (length and buffer ptr) are configured by the user in

the ‘Offline Mode’ in the DPS buffer management.

For the Dout data, four buffers of the same length are available that are implemented as exchange buffers.

One buffer each is assigned to the incoming data transfer ‘D’ and the user ‘U’. The third buffer is either in a

Next ‘N’ or Free ‘F’ mode. The MAC stores the data in ‘D’. After receiving, ‘D’ is moved to ‘N’, and a new

buffer is fetched from the ‘N’ or ‘F’. The user fetches its output data from ‘N’. In the fourth buffer ‘C’, the

user makes the substitute values available for the Clear mode (failsafe). If the DPC31 receives Clear

messages or if DPS leaves the ‘Data_Exchange’ mode, the 'C' buffer is transferred to the user in the state

‘U’. The buffers are moved through the corresponding exchange. DPS then also performs the buffer

exchange for the user.

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