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FlexRay Module Registers

26.3.2.1.3 ECC Test Register (ECCTEST)

The ECC Test Register can be used in diagnostic mode to read or write ECC information of message

RAM, transient buffer RAM, input buffer RAM and output buffer RAM locations. Write access to this

In order to be able to directly access the above mentioned RAM portions, RAM test mode must be

selected in test register 1 and the corresponding RAM section must be selected in test register 2. When

reading a certain RAM location, the corresponding ECC value is shown in RDECC bitfield. Writing to a

certain ECC location copies the contents of WRECC bitfield to the corresponding ECC location.

Figure 26-111 and Table 26-97 illustrate this register.

NOTE: For FTU RAM, a separate portion of memory-mapped RAM is available in TCR ECC test

mode, which can be accessed directly for reading or writing ECC information. See

Section 26.3.1.26 for more details.

Figure 26-111. ECC Test Register (ECCTEST) [offset_CC = 08h]

31 23 22 16

Reserved RDECC

R-0 R/W-0

15 7 6 0

Reserved WRECC

R-0 R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 26-97. ECC Test Register (ECCTEST) Field Descriptions

Bit Field Value Description

31-23 Reserved 0 Read returns 0. Writes have no effect.

22-16 RDECC 0-7Fh Holds ECC bits when reading a RAM location

15-7 Reserved 0 Read returns 0. Writes have no effect.

6-0 WRECC 0-7Fh ECC bits to be written in ECC location when writing to a RAM location

1273

SPNU563–May 2014 FlexRay Module

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