Motorola MVME2400 Series Service Manual download pdf (Page 237)

Programming Model

http://www.mcg.mot.com/literature 3-51

esbt esbt is set by the logging of a single-bit error. It is cleared

by the logging of a multiple-bit error. When the SMC logs

a single-bit error, the syndrome code indicates which bit

was in error. (Refer to the section on SDRAM ECC

Codes.)

ERR_SYNDROME ERR_SYNDROME reflects the syndrome value at the

last logging of an error. This eight-bit code indicates the

position of the data error. When all the bits are zero, there

was no error. Note that if the logged error was multiple-

bit then these bits are meaningless. Refer to the section on

SDRAM ECC Codes for a decoding of the syndromes.

esblk0,esblk1, esbik2 Together these three bits indicate which block of SDRAM

was being accessed when the SMC logged a scrub error.

esblk0,esblk1, esbik2 are 0,0,0 for Block A; 0,0,1 for

Block B; 0,1,0 for Block C; and 0,1,1 for Block D, etc.

scof

scof is set by the SBE COUNT register rolling over from

$FF to $00. It is cleared by software writing a 1 to it.

SBE COUNT

SBE_COUNT keeps track of the number of single-bit

errors that have occurred since it was last cleared. It

counts up by one each time it detects a single-bit error

(independent of the state of the elog bit). The

SBE_COUNT

is cleared by power-up reset and by

software writing all zeros to itself. When

SBE COUNT

rolls over from $FF to $00, the SMC sets

the scof bit. The rolling over of SBE_COUNT

pulses the

internal interrupt signal, SMC_INT, low if the scien

bit is

set.

1 2 ... 232 233 234 235 236 237 238 239 240 241 242 ... 353 354

No comments

Motorola MVME2400 Series Service Manual Page 237