MCIMX6DP6AYM2AB datasheet(68/160 Pages) NXP

68 / 160 page

i.MX 6DualPlus/6QuadPlus Applications Processors Industrial Products, Rev. 3, 11/2018

NXP Semiconductors

Electrical Characteristics

Figure 30. NAND_DQS/NAND_DQ Read Valid Window

Figure 30 shows the timing diagram of NAND_DQS/NAND_DATAxx read valid window. For Source

Synchronous mode, the typical value of tDQSQ is 0.85 ns (max) and 1 ns (max) for tQHS at 200MB/s.

GPMI will sample NAND_DATA[7:0] at both rising and falling edge of a delayed NAND_DQS signal,

which can be provided by an internal DPLL. The delay value can be controlled by GPMI register

GPMI_READ_DDR_DLL_CTRL.SLV_DLY_TARGET (see the GPMI chapter of the i.MX

6DualPlus/6QuadPlus reference manual (IMX6DQPRM)). Generally, the typical delay value of this

enough and cannot be ignored, the delay value should be made larger to compensate the board delay.

Table 41. Source Synchronous Mode Timing Parameters1

1 The GPMI source synchronous mode output timing can be controlled by the module’s internal registers

GPMI_TIMING2_CE_DELAY,GPMI_TIMING_PREAMBLE_DELAY,GPMI_TIMING2_POST_DELAY.ThisACtimingdepends

on these registers settings. In the table, CE_DELAY/PRE_DELAY/POST_DELAY represents each of these settings.

Parameter

Symbol

Timing

T = GPMI Clock Cycle

Unit

Min

Max

NF18 NAND_CEx_B access time

tCE

CE_DELAY

× T - 0.79 [see 2]

2 T = tCK (GPMI clock period) -0.075ns (half of maximum p-p jitter).

NF19 NAND_CEx_B hold time

tCH

0.5

× tCK - 0.63 [see 2]ns

NF20 Command/address NAND_DATAxx setup time

tCAS

0.5

× tCK - 0.05

NF21 Command/address NAND_DATAxx hold time

tCAH

0.5

× tCK - 1.23

NF22 clock period

tCK

—

NF23 preamble delay

tPRE

PRE_DELAY

× T - 0.29 [see 2]ns

NF24 postamble delay

tPOST

POST_DELAY

× T - 0.78 [see 2]ns

NF25 NAND_CLE and NAND_ALE setup time

tCALS

0.5

× tCK - 0.86

NF26 NAND_CLE and NAND_ALE hold time

tCALH

0.5

× tCK - 0.37

NF27 NAND_CLK to first NAND_DQS latching transition

tDQSS

T - 0.41 [see 2]ns

NF28 Data write setup

tDS

0.25

× tCK - 0.35

—

NF29 Data write hold

tDH

0.25

× tCK - 0.85

—

NF30 NAND_DQS/NAND_DQ read setup skew

tDQSQ

—

2.06

—

NF31 NAND_DQS/NAND_DQ read hold skew

tQHS

—

1.95

—

NF30

NF31

NF30

NF31

MCIMX6DP6AYM2AB Datasheet(PDF) 68 Page - NXP Semiconductors

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