SAP51D-B-G1-R datasheet(26/63 Pages) ETC2

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SAP5S / SAP51

Universal Actuator-Sensor Interface IC

Data Sheet

July 17, 2012

the prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to

changes without notice.

26 of 62

3.4. Safety Area Programming

The Safety Area contains the cryptographic code table which consists of 8 data words and one swap-flag

each (refer to chapter 4.18 on page 47 for an explanation of the SAP5 Safety Mode). Similar to the Firmware

Area

can

protected

against

undesired

data

modification

setting

the

Safety_Program_Mode_Disable flag to ‘1’, see Table 11.

NOTE: Once the Safety_Program_Mode_Disable flag is set, the Safety Area of the E²PROM is permanently

locked, i.e. write access to the Safety Area as described in chapter 3.4 is possible only as long as the

Safety_Program_Mode_Disable is set to ‘0’.

Table 11: SAP5 E²PROM - Safety Area Content

Logical

E²PROM

Address

Bit

Position

E²PROM Cell Content

Description

S_flag 0

swap flag 0

3 … 0

DI_S0 3 … 0

Data Input word 0 from Safety Code Table

S_flag 1

swap flag 1

3 … 0

DI_S1 3 … 0

Data Input word 1 from Safety Code Table

S_flag 2

swap flag 2

3 … 0

DI_S2 3 … 0

Data Input word 2 from Safety Code Table

S_flag 3

swap flag 3

3 … 0

DI_S3 3 … 0

Data Input word 3 from Safety Code Table

S_flag 4

swap flag 4

3 … 0

DI_S4 3 … 0

Data Input word 4 from Safety Code Table

S_flag 5

swap flag 5

3 … 0

DI_S5 3 … 0

Data Input word 5 from Safety Code Table

S_flag 6

swap flag 6

3 … 0

DI_S6 3 … 0

Data Input word 6 from Safety Code Table

S_flag 7

swap flag 7

3 … 0

DI_S7 3 … 0

Data Input word 7 from Safety Code Table

Safety_Mode_Enable

If set, Safety Mode can be enabled

Safety_Program_Mode_Disable If set, Safety Area is protected against overriding

Similar to the Firmware Area programming, Safety Area programming is intended to be used only during

production set-up of a slave component at the manufacturer’s site. Write Access to the Safety Area of the

E²PROM is feasible in the so called Safety Program Mode.

It can be entered only if the

Safety_Program_Mode_Disable flag is not yet set and if the slave address was set to 0x0. In the case that the

slave address equals zero, the reception of the Enter_Program_Mode_Safety (PRGM) call sets the SAP5

device into the Safety Program Mode. It should be noted that no response is generated to the

Enter_Program_Mode_Safety call (refer to AS-i Complete Specification).

Being in the Safety Program Mode, the Write_Parameter (WPAR) and Data_Exchange (DEXG) calls are used

to transfer data words to the

E²PROM similar to the Firmware Area write procedure described above.

However, the address bits A4...A0 of the master telegrams are used to address one of the memory locations

of the E²PROM (refer to Table 11). The information bits I4...I0 (normally used for output data) carry the data

which shall be stored.

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