ZQ0SR (DDR_PHY) Register Description
| Register Name | ZQ0SR |
|---|---|
| Offset Address | 0x000000069C |
| Absolute Address | 0x00FD08069C (DDR_PHY) |
| Width | 32 |
| Type | roRead-only |
| Reset Value | 0x00000000 |
| Description | ZQ 0 Impedance Control Status Register |
ZQ0SR (DDR_PHY) Register Bit-Field Summary
| Field Name | Bits | Type | Reset Value | Description |
|---|---|---|---|---|
| Reserved | 31:14 | roRead-only | 0x0 | Return zeroes on reads. |
| PD_ODT_SAT | 13 | roRead-only | 0x0 | Pulldown termination strength code saturated due to termination strength adjustment setting in ZQ0PR register. Will be zero only in DDR3 mode. If this is set to 1b1, the adjustment factor or ZPROG setting for the corresponding segment needs to be scaled. |
| PU_ODT_SAT | 12 | roRead-only | 0x0 | Pullup termination strength code saturated due to termination strength adjustment setting in ZQ0PR register. Will be zero only in DDR3 mode. If this is set to 1b1, the adjustment factor or ZPROG setting for the corresponding segment needs to be scaled. |
| PD_DRV_SAT | 11 | roRead-only | 0x0 | Pulldown drive strength code saturated due to drive strength adjustment setting in ZQ0PR register. Will be non-zero only in DDR4 mode. If this is set to 1b1, the adjustment factor or ZPROG setting for the corresponding segment needs to be scaled. |
| PU_DRV_SAT | 10 | roRead-only | 0x0 | Pullup drive strength code saturated due to drive strength adjustment setting in ZQ0PR register. Will be non-zero only in DDR4 mode. If this is set to 1b1, the adjustment factor or ZPROG setting for the corresponding segment needs to be scaled. |
| ZDONE | 9 | roRead-only | 0x0 | Impedance Calibration Done: Indicates that the first round of impedance calibration has completed. Any time impedance calibration is restarted (after a ZCAL bypass exit or ZCAL configuration register write), this bit goes back to '0' till all segments are re-calibrated, following which this bit returns to '1'. |
| ZERR | 8 | roRead-only | 0x0 | Impedance Calibration Error: If set, indicates that there was an error during impedance calibration. |
| OPU | 7:6 | roRead-only | 0x0 | On-die termination (ODT) pull-up calibration status. Valid status encodings are: 2b00 = Completed with no errors 2b01 = Overflow error 2b10 = Underflow error 2b11 = Calibration in progress |
| OPD | 5:4 | roRead-only | 0x0 | On-die termination (ODT) pull-down calibration status. Valid status encodings are: 2b00 = Completed with no errors 2b01 = Overflow error 2b10 = Underflow error 2b11 = Calibration in progress |
| ZPU | 3:2 | roRead-only | 0x0 | Output impedance pull-up calibration status. Valid status encodings are: 2b00 = Completed with no errors 2b01 = Overflow error 2b10 = Underflow error 2b11 = Calibration in progress |
| ZPD | 1:0 | roRead-only | 0x0 | Output impedance pull-down calibration status. Valid status encodings are: 2b00 = Completed with no errors 2b01 = Overflow error 2b10 = Underflow error 2b11 = Calibration in progress |