STRUCT NAND_NVDDR_TIMINGS(9)

💅 struct nand_nvddr_timings — NV-DDR NAND chip timings 🎀

okay bestie, welcome to the Kernel API Manual ✨ this is the page for struct nand_nvddr_timings(9), and no cap it's lowkey just a big ol' bag of timing numbers for talking to NV-DDR NAND chips. buckle up 🦋

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🌸 NAME 🌸

struct nand_nvddr_timings — the timing requirements of an NV-DDR NAND chip 🫶

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✨ SYNOPSIS ✨

here's the whole struct, verbatim, don't touch a single character bestie:

struct nand_nvddr_timings {
    u64 tBERS_max;
    u32 tCCS_min;
    u64 tPROG_max;
    u64 tR_max;
    u32 tAC_min;
    u32 tAC_max;
    u32 tADL_min;
    u32 tCAD_min;
    u32 tCAH_min;
    u32 tCALH_min;
    u32 tCALS_min;
    u32 tCAS_min;
    u32 tCEH_min;
    u32 tCH_min;
    u32 tCK_min;
    u32 tCS_min;
    u32 tDH_min;
    u32 tDQSCK_min;
    u32 tDQSCK_max;
    u32 tDQSD_min;
    u32 tDQSD_max;
    u32 tDQSHZ_max;
    u32 tDQSQ_max;
    u32 tDS_min;
    u32 tDSC_min;
    u32 tFEAT_max;
    u32 tITC_max;
    u32 tQHS_max;
    u32 tRHW_min;
    u32 tRR_min;
    u32 tRST_max;
    u32 tWB_max;
    u32 tWHR_min;
    u32 tWRCK_min;
    u32 tWW_min;
 };

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🎀 Members 🎀

thirty-five fields, and every single one is a whole vibe. let's go 💅

• tBERS_max — block erase time ⏳
• tCCS_min — change column setup time
• tPROG_max — page program time
• tR_max — page read time 📖
• tAC_min — access window of DQ[7:0] from CLK
• tAC_max — access window of DQ[7:0] from CLK (yes, same words as its partner, the datasheet said what it said 🫠)
• tADL_min — ALE to data loading time
• tCAD_min — command, address, data delay
• tCAH_min — command/address DQ hold time
• tCALH_min — W/R_n, CLE and ALE hold time
• tCALS_min — W/R_n, CLE and ALE setup time
• tCAS_min — command/address DQ setup time
• tCEH_min — CE# high hold time
• tCH_min — CE# hold time
• tCK_min — average clock cycle time ⏰
• tCS_min — CE# setup time
• tDH_min — data hold time
• tDQSCK_min — start of the access window of DQS from CLK
• tDQSCK_max — end of the access window of DQS from CLK
• tDQSD_min — min W/R_n low to DQS/DQ driven by device
• tDQSD_max — max W/R_n low to DQS/DQ driven by device
• tDQSHZ_max — W/R_n high to DQS/DQ tri-state by device 🚦
• tDQSQ_max — DQS-DQ skew, DQS to last DQ valid, per access
• tDS_min — data setup time
• tDSC_min — DQS cycle time
• tFEAT_max — busy time for Set Features and Get Features
• tITC_max — interface and timing mode change time 🔄
• tQHS_max — data hold skew factor
• tRHW_min — data output cycle to command, address, or data input cycle
• tRR_min — ready to RE# low (data only)
• tRST_max — device reset time, measured from the falling edge of R/B# to the rising edge of R/B#. 👑
• tWB_max — WE# high to SR[6] low
• tWHR_min — WE# high to RE# low
• tWRCK_min — W/R_n low to data output cycle
• tWW_min — WP# transition to WE# low

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🦋 Description 🦋

so like, this struct defines the timing requirements of a NV-DDR NAND data interface. that's it, that's the whole job 🫡

where do the numbers come from? every NAND datasheet has them, and the timings' meanings are described in the ONFI specifications — right here:

https://media-www.micron.com/-/media/client/onfi/specs/onfi_4_1_gold.pdf

specifically chapter 4.18.2 NV-DDR 📎 (iykyk)

important bestie note: all these timings are expressed in picoseconds. tiny numbers for tiny time, iconic 💜

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🌈 SEE ALSO 🌈

the whole friend group 🫶 go read the kernel file ./include/linux/mtd/rawnand.h and then all of these:

struct nand_parameters(9), struct nand_id(9), struct nand_ecc_step_info(9), struct nand_ecc_caps(9), struct nand_ecc_ctrl(9), struct nand_sdr_timings(9), enum nand_interface_type(9), struct nand_interface_config(9), nand_interface_is_sdr(9), nand_interface_is_nvddr(9), nand_get_sdr_timings(9), nand_get_nvddr_timings(9), struct nand_op_cmd_instr(9), struct nand_op_addr_instr(9), struct nand_op_data_instr(9), struct nand_op_waitrdy_instr(9), enum nand_op_instr_type(9), struct nand_op_instr(9), struct nand_subop(9), struct nand_op_parser_addr_constraints(9), struct nand_op_parser_data_constraints(9), struct nand_op_parser_pattern_elem(9), struct nand_op_parser_pattern(9), struct nand_op_parser(9), struct nand_operation(9), struct nand_controller_ops(9), struct nand_controller(9), struct nand_legacy(9), struct nand_chip_ops(9), struct nand_manufacturer(9), struct nand_secure_region(9), struct nand_chip(9), nand_get_interface_config(9), struct nand_flash_dev(9), nand_opcode_8bits(9), nand_get_data_buf(9)

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and that's the page!! 🍓 this lil masterpiece lives at ./include/linux/mtd and it's from the Kernel API Manual, dated October 2026 — like, future vibes fr fr ⭐ mwah, go read your datasheets bestie, ily 💖🧚