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DPC31 HW Description

Version V1.0 Page 23

5.1.3 Acknowledgement Interface (Indication_Queue)

FMA confirmations (for example, MAC_Reset con; refer to Chapter 5.1.2) are transferred to the user in an

Indication_Queue (polling list). Figure 5.1-3 shows the organization of the Indication_Queue. With each

entry (3 bytes respectively), the ‘IndQ_Entry Int’ is additionally generated for the user. If the queue is full and

the MAC is to make another entry, this indication is abandoned and the ‘IndQ_Full Int’ is set (refer to Chapter

7.1.4). The user should avoid this condition by dimensioning the queue accordingly large. There is no effect

on the bus (for example, no RR if the queue is full).

The organization of the Indication_Queue includes the following parameters:

IndQ_Base Ptr: The Indication_Queue segment pointer

IndQ_Length: Describes the length of the Indication_Queue, and is a multiple of the length of an

entry (n*3)

IndQRd Ptr: An Offset_Pointer and points to the next entry that is to be read (and is managed by

the user)

IndQ_Wr Ptr: An Offset_Pointer and points to the next free entry (and is managed by the MAC)

The queue is empty if ‘IndQ_Wr Ptr’ and ‘IndQ_Rd Ptr’ point to the same position.

One entry in the queue

always has to remain empty (refer to Chapter 5.1.2).

Table 5.1-4 lists all possible indications with the associated command codes.

Entry 1:

Command_Code

Value1

Value2

Entry 2:

Command_Code

Value1

Value2

.....

Entry n:

Command_Code

Value1

Value2

Wildcard:

reserved

IndQ_Len

IndQ_Wr Ptr (MAC)

IndQ_Rd Ptr (User)

IndQ_Base Ptr

Addr.

Figure 5.1-3:

Organization of the Indication_Queue

Request Com_Code Value1 Value2 Comment

MAC_Stop Confirmation 81h - - MAC_Stop was executed

DPS_User WD Expired 84h - - DPS_User Watchdog timer expired

Table 5.1.4:

Overview of Indications and Confirmations

Note:

MAC_Stop confirmation confirms the MAC transition to the

Offline mode

after the current request has been

processed.

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 93 94

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