AM6422: LPDDR4 DQ/DM to DQS Skew Requirement

Part Number: AM6422

Tool/software:

Per AM64x PCB Guideline, the LP4_DRS5, DQ/DM to DQS skew is required with maximum 150psec. 

Could you clarify the max 150psec means that DQ/DM to DQS skew is +/-75ps which means that DATA byte can be either 75ps  shorter (approximately -450mils) or 75psec longer (approximately +50mils) than DQS ?