Appendix: Timing Parameters

The following table lists the timing parameters used in this document.

Table 1. Timing Parameters
Parameter Description
tXPR Exit reset from CKE HIGH to a valid command
tINIT1 Minimum CKE LOW time after completion of voltage ramp
tINIT3 Minimum idle time after the first CKE assertion
tINIT5 Maximum duration of device auto initialization
tZQINIT ZQ initial calibration
tRP PRECHARGE command period
tRFC REFRESH-to-ACTIVATE or REFRESH command period