Zynq UltraScale+ Devices Register Reference > Module Summary > DDR_PHY Module > PTR3 (DDR_PHY) Register

PTR3 (DDR_PHY) Register

PTR3 (DDR_PHY) Register Description

Register NamePTR3
Relative Address0x000000004C
Absolute Address 0x00FD08004C (DDR_PHY)
Width32
TypemixedMixed types. See bit-field details.
Reset Value0x00411810
DescriptionPHY Timing Register 3

PTR3 (DDR_PHY) Register Bit-Field Summary

Field NameBitsTypeReset ValueDescription
Reserved31:23roRead-only0x0Return zeroes on reads.
tDINIT022:0rwNormal read/write0x411810DRAM Initialization Time 0: DRAM initialization time in DRAM clock
cycles corresponding to the following:
DDR4 = CKE low time with power and clock stable (500 us)
DDR3 = CKE low time with power and clock stable (500 us)
LPDDR4 = CKE low time with power and clock stable (2000 us)
LPDDR3 = CKE high time to first command (200 us)
Note:
Default value corresponds to LPDDR4 CKE low time of 2000
us at 2133 MHz.