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ZHCSIC7H March 2016 – November 2019 DRA722 , DRA724 , DRA725 , DRA726

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7.17 Quad Serial Peripheral Interface (QSPI)

The Quad SPI (QSPI) module is a type of SPI module that allows single, dual or quad read access to external SPI devices. This module has a memory mapped register interface, which provides a direct interface for accessing data from external SPI devices and thus simplifying software requirements. It works as a master only. There is one QSPI module in the device and it is primary intended for fast booting from quad-SPI flash memories.

General SPI features:

Programmable clock divider
Six pin interface (DCLK, CS_N, DOUT, DIN, QDIN1, QDIN2)
4 external chip select signals
Support for 3-, 4- or 6-pin SPI interface
Programmable CS_N to DOUT delay from 0 to 3 DCLKs
Programmable signal polarities
Programmable active clock edge
Software controllable interface allowing for any type of SPI transfer

NOTE

For more information, see Quad Serial Peripheral Interface section in the device TRM.

CAUTION

The I/O Timings provided in this section are only valid when all QSPI Chip Selects used in a system are configured to use the same Clock Mode (either Clock Mode 0 or Clock Mode 3).

CAUTION

The I/O Timings provided in this section are valid only for some QSPI usage modes when the corresponding Virtual I/O Timings or Manual I/O Timings are configured as described in the tables found in this section.

Table 7-45 and Table 7-46 Present Timing and Switching Characteristics for Quad SPI Interface.

Table 7-45 Switching Characteristics for QSPI

NO.	PARAMETER	DESCRIPTION	MODE	MIN	MAX	UNIT
Q1	t_c(SCLK)	Cycle time, sclk	Default Timing Mode, Clock Mode 0	11.71		ns
Q1	t_c(SCLK)	Cycle time, sclk	Default Timing Mode, Clock Mode 3	20.8		ns
Q2	t_w(SCLKL)	Pulse duration, sclk low		Y × P - 1 ^⁽¹⁾		ns
Q3	t_w(SCLKH)	Pulse duration, sclk high		Y × P - 1 ^⁽¹⁾		ns
Q4	t_d(CS-SCLK)	Delay time, sclk falling edge to cs active edge, CS3:0	Default Timing Mode	-M × P - 1.6 ^{⁽²⁾⁽³⁾}	-M × P + 2.6 ^{⁽²⁾⁽³⁾}	ns
Q5	t_d(SCLK-CS)	Delay time, sclk falling edge to cs inactive edge, CS3:0	Default Timing Mode	N × P - 1.6 ^{⁽²⁾⁽³⁾}	N × P + 2.6 ^{⁽²⁾⁽³⁾}	ns
Q6	t_d(SCLK-D0)	Delay time, sclk falling edge to d[0] transition	Default Timing Mode	-1.6	2.6	ns
Q7	t_ena(CS-D0LZ)	Enable time, cs active edge to d[0] driven (lo-z)		-P - 3.5	-P + 2.5	ns
Q8	t_dis(CS-D0Z)	Disable time, cs active edge to d[0] tri-stated (hi-z)		-P - 2.5	-P + 2.0	ns
Q9	t_d(SCLK-D0)	Delay time, sclk first falling edge to first d[0] transition	PHA=0 Only, Default Timing Mode	-1.6 - P^⁽²⁾	2.6 - P^⁽²⁾	ns

The Y parameter is defined as follows:
If DCLK_DIV is 0 or ODD then, Y equals 0.5.
If DCLK_DIV is EVEN then, Y equals (DCLK_DIV/2) / (DCLK_DIV+1).
For best performance, it is recommended to use a DCLK_DIV of 0 or ODD to minimize the duty cycle distortion. The HSDIVIDER on CLKOUTX2_H13 output of DPLL_PER can be used to achieve the desired clock divider ratio. All required details about clock division factor DCLK_DIV can be found in the device-specific Technical Reference Manual.
P = SCLK period.
M=QSPI_SPI_DC_REG.DDx + 1 when Clock Mode 0.
M=QSPI_SPI_DC_REG.DDx when Clock Mode 3.
N = 2 when Clock Mode 0.
N = 3 when Clock Mode 3.

DRA722 DRA724 DRA725 DRA726 SPRS906_TIMING_QSPI1_01.gif

Figure 7-37 QSPI Read (Clock Mode 3)

DRA722 DRA724 DRA725 DRA726 SPRS906_TIMING_QSPI1_02.gif

Figure 7-38 QSPI Read (Clock Mode 0)

CAUTION

Table 7-46 Timing Requirements for QSPI^⁽³⁾^⁽²⁾

NO.	PARAMETER	DESCRIPTION	MODE	MIN	UNIT
Q12	t_su(D-RTCLK)	Setup time, d[3:0] valid before falling rtclk edge	Default Timing Mode, Clock Mode 0	4.6	ns
Q12	t_su(D-SCLK)	Setup time, d[3:0] valid before falling sclk edge	Default Timing Mode, Clock Mode 3	12.3	ns
Q13	t_h(RTCLK-D)	Hold time, d[3:0] valid after falling rtclk edge	Default Timing Mode, Clock Mode 0	-0.1	ns
Q13	t_h(SCLK-D)	Hold time, d[3:0] valid after falling sclk edge	Default Timing Mode, Clock Mode 3	0.1	ns
Q14	t_su(D-SCLK)	Setup time, final d[3:0] bit valid before final falling sclk edge	Default Timing Mode, Clock Mode 3	12.3 - P ^⁽¹⁾	ns
Q15	t_h(SCLK-D)	Hold time, final d[3:0] bit valid after final falling sclk edge	Default Timing Mode, Clock Mode 3	0.1 + P ^⁽¹⁾	ns

P = SCLK period.
Clock Modes 1 and 2 are not supported.
The Device captures data on the falling clock edge in Clock Mode 0 and 3, as opposed to the traditional rising clock edge. Although non-standard, the falling-edge-based setup and hold time timings have been designed to be compatible with standard SPI devices that launch data on the falling edge in Clock Modes 0 and 3.

DRA722 DRA724 DRA725 DRA726 SPRS906_TIMING_QSPI1_03.gif

Figure 7-39 QSPI Write (Clock Mode 3)

DRA722 DRA724 DRA725 DRA726 SPRS906_TIMING_QSPI1_04.gif

Figure 7-40 QSPI Write (Clock Mode 0)

CAUTION

NOTE

To configure the desired Manual IO Timing Mode the user must follow the steps described in section Manual IO Timing Modes of the Device TRM.

The associated registers to configure are listed in the CFG REGISTER column. For more information see Control Module chapter in the device TRM.

Manual IO Timings Modes must be used to ensure some IO timings for QSPI. See Table 7-2Modes Summary for a list of IO timings requiring the use of Manual IO Timings Modes. See Table 7-47Manual Functions Mapping for QSPI for a definition of the Manual modes.

Table 7-47 lists the A_DELAY and G_DELAY values needed to calculate the correct values to be set in the CFG_x registers.

Table 7-47 Manual Functions Mapping for QSPI

BALL	BALL NAME	QSPI1_MANUAL1		CFG REGISTER	MUXMODE
BALL	BALL NAME	A_DELAY (ps)	G_DELAY (ps)	CFG REGISTER	1
T7	gpmc_a3	0	0	CFG_GPMC_A3_OUT	qspi1_cs2
P6	gpmc_a4	0	0	CFG_GPMC_A4_OUT	qspi1_cs3
R3	gpmc_a13	0	0	CFG_GPMC_A13_IN	qspi1_rtclk
T2	gpmc_a14	2247	1186	CFG_GPMC_A14_IN	qspi1_d3
U2	gpmc_a15	2176	1197	CFG_GPMC_A15_IN	qspi1_d2
U1	gpmc_a16	2229	1268	CFG_GPMC_A16_IN	qspi1_d0
U1	gpmc_a16	0	0	CFG_GPMC_A16_OUT	qspi1_d0
P3	gpmc_a17	2251	1217	CFG_GPMC_A17_IN	qspi1_d1
R2	gpmc_a18	0	0	CFG_GPMC_A18_OUT	qspi1_sclk
P2	gpmc_cs2	0	0	CFG_GPMC_CS2_OUT	qspi1_cs0
P1	gpmc_cs3	0	0	CFG_GPMC_CS3_OUT	qspi1_cs1

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7.17 Quad Serial Peripheral Interface (QSPI)

Table 7-45 Switching Characteristics for QSPI

Table 7-46 Timing Requirements for QSPI(3)(2)

Table 7-47 Manual Functions Mapping for QSPI

Table 7-46 Timing Requirements for QSPI^⁽³⁾^⁽²⁾