MAC7200 datasheet(352/976 Pages) FREESCALE

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Memory Map/Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

274

Freescale Semiconductor

Table 13-29 associates the upper 7 bits of the ECC syndrome with the exact data bit in error for single-bit

correctable codewords. This table follows the bit vectoring notation where the LSB=0. Note that the

syndrome value of 0x01 implies no error condition but this value is not readable when the PRESR is read

for the no error case.

13.2.2.15.10 RAM ECC Master Number Register (REMR)

The REMR is a 4-bit register for capturing the AXBS bus master number of the last, properly-enabled ECC

event in the RAM memory. Depending on the state of the ECC Configuration Register, an ECC event in

Table 13-28. RESR Field Descriptions

Field

Description

7–0

RESR[7:0]

RAM ECC Syndrome Register. This 8-bit syndrome field includes 6 bits of Hamming decoded parity plus

an odd-parity bit for the entire 39-bit (32-bit data + 7 ECC) code word. The upper 7 bits of the syndrome

specify the exact bit position in error for single-bit correctable codewords, and the combination of a

non-zero 7-bit syndrome plus overall incorrect parity bit signal a multi-bit, non-correctable error.

For correctable single-bit errors, the mapping shown in Table 13-29 associates the upper 7 bits of the

syndrome with the data bit in error.

Table 13-29. RAM Syndrome Mapping for Single-Bit Correctable Errors

RESR[7:0]

Data Bit in Error

RESR[7:0]

Data Bit in Error

0x00

ECC ODD[0]

0x28

DATA ODD BANK[17]

0x01

No Error

0x2a

DATA ODD BANK[16

0x02

ECC ODD[1]

0x2c

DATA ODD BANK[15]

0x04

ECC ODD[2]

0x58

DATA ODD BANK[14]

0x06

DATA ODD BANK[31]

0x30

DATA ODD BANK[13]

0x08

ECC ODD[3]

0x32

DATA ODD BANK[12]

0x0a

DATA ODD BANK[30]

0x34

DATA ODD BANK[11]

0x0c

DATA ODD BANK[29]

0x64

DATA ODD BANK[10]

0x0e

DATA ODD BANK[28]

0x38

DATA ODD BANK[9]

0x10

ECC ODD[4]

0x62

DATA ODD BANK[8]

0x12

DATA ODD BANK[27]

0x70

DATA ODD BANK[7]

0x14

DATA ODD BANK[26]

0x60

DATA ODD BANK[6]

0x16

DATA ODD BANK[25]

0x40

ECC ODD[6]

0x18

DATA ODD BANK[24]

0x42

DATA ODD BANK[5]

0x1a

DATA ODD BANK[23]

0x44

DATA ODD BANK[4]

0x1c

DATA ODD BANK[22]

0x46

DATA ODD BANK[3]

0x50

DATA ODD BANK[21]

0x48

DATA ODD BANK[2]

0x20

ECC ODD[5]

0x4a

DATA ODD BANK[1]

0x22

DATA ODD BANK[20]

0x4c

DATA ODD BANK[0]

0x24

DATA ODD BANK[19]

0x03,0x05........0x4d

Multiple bit error

0x26

DATA ODD BANK[18]

> 0x4d

Multiple bit error

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