DRAMTMG5_SHADOW (DDRC) Register Description
| Register Name | DRAMTMG5_SHADOW |
|---|---|
| Offset Address | 0x0000002114 |
| Absolute Address | 0x00FD072114 (DDRC) |
| Width | 32 |
| Type | rwNormal read/write |
| Reset Value | 0x05050403 |
| Description | SDRAM Timing Shadow Register 5 |
This register is quasi-dynamic group 2 and group 4. Group 2 registers can be written in self-refresh, deep power-down, and maximum power saving modes. Group 4 registers can be written depending on MSTR.frequency_mode.
DRAMTMG5_SHADOW (DDRC) Register Bit-Field Summary
| Field Name | Bits | Type | Reset Value | Description |
|---|---|---|---|---|
| t_cksrx | 27:24 | rwNormal read/write | 0x5 | This is the time before Self Refresh Exit that CK is maintained as a valid clock before issuing SRX. Specifies the clock stable time before SRX. Recommended settings: - LPDDR3: 2 - LPDDR4: tCKCKEH - DDR3: tCKSRX - DDR4: tCKSRX Program this to recommended value divided by two and round it up to next integer. |
| t_cksre | 19:16 | rwNormal read/write | 0x5 | This is the time after Self Refresh Down Entry that CK is maintained as a valid clock. Specifies the clock disable delay after SRE. Recommended settings: - LPDDR3: 2 - LPDDR4: tCKCKEL - DDR3: max (10 ns, 5 tCK) - DDR4: max (10 ns, 5 tCK) Program this to recommended value divided by two and round it up to next integer. |
| t_ckesr | 13:8 | rwNormal read/write | 0x4 | Minimum CKE low width for Self refresh or Self refresh power down entry to exit timing in memory clock cycles. Recommended settings: - LPDDR3: tCKESR - LPDDR4: max(tCKELPD, tSR) - DDR3: tCKE + 1 - DDR4: tCKE + 1 Program this to recommended value divided by two and round it up to next integer. |
| t_cke | 4:0 | rwNormal read/write | 0x3 | Minimum number of cycles of CKE HIGH/LOW during power-down and self refresh. - LPDDR3 mode: Set this to the larger of tCKE or tCKESR - LPDDR4 mode: Set this to the larger of tCKE, tCKELPD or tSR. - Non-non-LPDDR3/non-LPDDR4 designs: Set this to tCKE value. Program this to (value described above)/2 and round it up to the next integer value. Unit: Clocks. |