SAP5SD-B-G1-R datasheet(47/67 Pages) RENESAS

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SAP51 / SAP5S Datasheet

January 28, 2016

If the Communication Watchdog detects a No Data Exchange status, it takes the following actions:

•

It concurrently generates the Data and Parameter Strobe signals at the DSTBn and PSTBn pins with

timing according to Figure 5.3 and Figure 5.2 respectively. NOTE: At this time, the data and parameter

output values still comply with the values received with the last DEXG and WPAR master call,

respectively.

•

After the DSTBn and PSTBn strobe generation has finished, the Communication Watchdog invokes an

unconditioned SAP5 reset. It sets the Data_Exchange_Disable flag and afterwards starts the SAP5

initialization procedure, switching all Data and Parameter Outputs inactive.

In order to resume normal Data Port communication after a Watchdog SAP5 Reset, the Data_Exchange_Disable

flag must be cleared again. Therefore, the master must send a WPAR request again before the Data Port

communication can be re-established. This ensures new parameter setup of any connected external circuitry.

The state until the Data_Exchange_Disable flag returns to ‘0’ is signaled by a certain LED1 and LED2 status

indication (refer to section 5.11).

5.18. Safety Mode (SAP5S only)

The Safety Mode is active as soon as the EEPROM flag Safety_Mode_Enable is set to ‘1’ (logic high). Thus, it is

basically independent of the slave profile; whereas the assignment of the 3-level-input pins discussed below to

either the Data or Parameter Port depends on the IO_Code as described in Table 5.15.

Furthermore, in order to fulfill specific security requirements, the Safety Mode is not combinable with any of the

following SAP5 features:

•

Delay Mode (section 5.8.2)

•

Synchronous Data I/O Mode (section 5.8.3)

•

Ext_Addr_4I/4O_Mode (section 5.8.4)

•

P0 Watchdog Activation (section 5.17)

The Safety Mode of the SAP5 is of relevance to the actions following an DEXG master request. Instead of the

regular input data provided at the data ports, a 4-bit data word from a specific 8

∗ 4 bit code table as described in

the third-party document Specification of safe AS-i transmission (see section 9.2) is transmitted to the master.

Cycling the code table is used to transmit another data word with each DEXG master call.

In order to meet specific safety requirements, the data words transmitted to the master pass through a special

pre-processing. Therefore, the code table stored within the Safety Area of the EEPROM (refer to Table 4.4) does

not match the reference code table as specified in the Specification of Safe AS-i Transmission but is derived from

a special coding scheme as described in Table 5.23. See the requirements below the table for the explanation of

the asterisks in the table.

SAP5SD-B-G1-R 数据表(PDF) 47 Page - Renesas Technology Corp

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