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Diagnostic LED Decoder
LED #
Upper Nibble
Checkpoint
Lower Nibble
MRC Progress Codes
Upper Nibble
B0h
Lower Nibble
Upper Nibble
B1h
Lower Nibble
Upper Nibble
B2h
Lower Nibble
Upper Nibble
B3h
Lower Nibble
Upper Nibble
B4h
Lower Nibble
Upper Nibble
B5h
Lower Nibble
Upper Nibble
B6h
Lower Nibble
Upper Nibble
B7h
Lower Nibble
Upper Nibble
B8h
Lower Nibble
Upper Nibble
B9h
Lower Nibble
Upper Nibble
BAh
Lower Nibble
Upper Nibble
BBh
Lower Nibble
Upper Nibble
BCh
Lower Nibble
Upper Nibble
BFh
Lower Nibble
69
Intel® Server System R1000SPO Product Family TPS
Table 40. MRC Progress Codes
LED 3
LED 2
LED 1
8h (MSB)
4h
2h
8h (MSB)
4h
2h
ON
off
ON
off
off
off
ON
off
ON
off
off
off
ON
off
ON
off
off
ON
ON
off
ON
off
off
ON
ON
off
ON
off
ON
off
ON
off
ON
off
ON
off
ON
off
ON
off
ON
ON
ON
off
ON
off
ON
ON
ON
off
ON
ON
off
off
ON
off
ON
ON
off
off
ON
off
ON
ON
off
ON
ON
off
ON
ON
off
ON
ON
off
ON
ON
ON
off
ON
off
ON
ON
ON
ON
LED 0
1h (LSB)
Description
1h (LSB)
ON
Detect DIMM population
off
ON
Set DDR4 frequency
ON
ON
Gather remaining SPD data
off
ON
Program registers on the memory controller level
ON
ON
Evaluate RAS modes and save rank information
off
ON
Program registers on the channel level
ON
ON
Perform the JEDEC defined initialization sequence
off
ON
Train DDR4 ranks
ON
ON
Initialize CLTT/OLTT
off
ON
Hardware memory test and init
ON
ON
Execute software memory init
off
ON
Program memory map and interleaving
ON
ON
Program RAS configuration
off
ON
MRC is done
ON
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