L99LDLH32 datasheet(56/142 Pages) STMICROELECTRONICS

56 / 142 page

FTP and RAM memory mapping

L99LDLH32

56/142

DS12879 Rev 6

FTP and RAM memory mapping

The L99LDLH32 is equipped with a 2 kbits EEPROM, used also to store device

configuration data. Part of this memory will be managed by the customer.

The device can operate in stand-alone mode (no microcontroller used) thanks to full

configurability by FTPs. In application, the FTPs can be programmed (up to NFTP cycles) via

CAN FD Light compatible interface – even if the device does not integrate any counter to

take note about the FTP writing cycles. By the way, for safety reason, any FTP sector can

be locked to avoid unintentional writing.

The user can program FTPs setting CS pin to “1” via HW or via SW.

Figure 33. FTP access through CAN bus - programming by physical pin CS

Yes

LSB

4 bits

After

, Read FTP

FTP_WR

Customer Sector

0000DCBA on address 1E.

(*) Test Mode Customer key word:

If it is 1, Test Mode Customer entering is OK.

(**) Test Mode Customer read 1E Status Register bit 0.

(either Fail Safe or Bus Mode)

The device has to be kept in Active Mode

Note:

sectors

Address: contained in the following 4 bits, it represents space address for customer

(FTP Read / Program)

OpCode: contained in the first 4 bits, it represents the instruction to be performed

reaching the initialization state.

Lock configuration is applied once device

Shadow Registers are loaded from FTP.

MSB

4 bits

OpCode

PARITY – 8 bits

MSB

DATA – 120 bits

128 bits in FTP

Address

DATA – 120 bits

128 bits in Frame CAN

Program FTP

Entry OK?

Test Mode Customer

dedicated bit (**)

Read Test Mode Customer

Physical Pin CS =1

key word 32 bits (*)

Write Test Mode Customer

Physical pin CS = 0

Read OK?

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