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19.3.5.4 Fields
Field
Function
31-0
B0_3DATA_MA
SK
Data Mask Bytes 0-3
This field defines a bit-mapped mask that specifies whether the corresponding bit of the read data bus
from the target RAM should be inverted or remain unmodified.
NOTE: For each channel: For the exact width of B0_3DATA_MASK and the specific DATA_MASK bits
to which B0_3DATA_MASK corresponds, see Error injection channel descriptor: DATA_MASK
details.
0b - The corresponding bit of bytes 0-3 on the read data bus remains unmodified.
1b - The corresponding bit of bytes 0-3 on the read data bus is inverted.
19.4 Functional description
The EIM provides protection against accidental enabling and reconfiguration of the error
injection function by enforcing a two-stage enablement mechanism. To properly enable
the error injection mechanism for a channel:
• Write 1 to the EICHEN[EICHnEN] field, where n denotes the channel number.
• Write 1 to EIMCR[GEIEN].
NOTE
When the use case for a channel requires writing any
EICHDn_WORD register, write the EICHDn_WORD register
before executing the two-stage enablement mechanism. A
successful write to any EICHDn_WORD register clears the
corresponding EICHEN[EICHnEN] field.
The EIM supports 2 error injection channels. Each channel:
• Is assigned to a single memory array interface.
• Intercepts the assigned memory read data bus and checkbit bus and injects errors by
inverting the value transmitted for selected bits on each bus line.
On a memory read access, the applicable EICHDn_WORD register defines which bit of
the read data and/or checkbit bus to invert.
depicts the interception and override of a 64-bit read data bus and an 8-bit
checkbit data bus for an example memory array.
Chapter 19 Error Injection Module (EIM)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
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