ACIOCR0 (DDR_PHY) Register

Zynq UltraScale+ Devices Register Reference (UG1087)

Document ID
UG1087
Release Date
2024-03-13
Revision
1.10

ACIOCR0 (DDR_PHY) Register Description

Register NameACIOCR0
Offset Address0x0000000500
Absolute Address 0x00FD080500 (DDR_PHY)
Width32
TypemixedMixed types. See bit-field details.
Reset Value0x30000000
DescriptionAC I/O Configuration Register 0

ACIOCR0 (DDR_PHY) Register Bit-Field Summary

Field NameBitsTypeReset ValueDescription
ACSR31:30rwNormal read/write0x0Address/Command Slew Rate (D3F I/O Only): Selects slew rate of the
I/O for all address and command pins.
RSTIOM29rwNormal read/write0x1SDRAM Reset I/O Mode: Selects SSTL mode (when set to 0) or CMOS
mode (when set to 1) of the I/O for SDRAM Reset.
RSTPDR28rwNormal read/write0x1SDRAM Reset Power Down Receiver: Powers down, when set, the
input receiver on the I/O for SDRAM RST# pin.
Reserved27roRead-only0x0Reserved. Return zeros on reads.
RSTODT26rwNormal read/write0x0SDRAM Reset On-Die Termination: Enables, when set, the on-die
termination on the I/O for SDRAM RST# pin.
Reserved25:10roRead-only0x0Reserved. Return zeros on reads.
CKDCC 9:6rwNormal read/write0x0CK Duty Cycle Correction
ACPDRMODE 5:4rwNormal read/write0x0AC Power Down Receiver mode for AC CK, CK_N
2b00 = PDR Dynamic
2b01 = PDR always ON
2b10 = PDR always OFF
2b11 = Reserved
ACODTMODE 3:2rwNormal read/write0x0Address/Command On-Die mode for AC, CK, CK_N
2b00 = ODT Dynamic
2b01 = ODT always ON
2b10 = ODT always OFF
2b11 = Reserved
Reserved 1roRead-only0x0Reserved. Return zeros on reads.
ACRANKCLKSEL 0rwNormal read/write0x0Control delayed or non-delayed clock to CS_N/ODT/CKE AC slices.
This bit is used in LPDDR4 CBT.
1'b0: Non-delayed clock to CS_N/ODT/CKE AC slices.
1'b1: Delayed clock to CS_N/ODT/CKE AC slices.