6.10.5.19.1.1 OSPI0/1 With PHY Data Training

Read and write data valid windows will shift due to variation in process, voltage, temperature, and operating frequency. A data training method may be implemented to dynamically configure optimal read and write timing. Implementing data training enables proper operation across temperature with a specific process, voltage, and frequency operating condition, while achieving a higher operating frequency.

Data transmit and receive timing parameters are not defined for the data training use case since they are dynamically adjusted based on the operating condition.

Table 6-86 defines DLL delays required for OSPI0/1 with Data Training. Table 6-87, Figure 6-102, Figure 6-103, Table 6-88, Figure 6-104, and Figure 6-105 present timing requirements and switching characteristics for OSPI0/1 with Data Training.

Table 6-86 OSPI0/1 DLL Delay Mapping for PHY Data Training

MODE	OSPI_PHY_CONFIGURATION_REG BIT FIELD	DELAY VALUE
Transmit
All modes	PHY_CONFIG_TX_DLL_DELAY_FLD	⁽¹⁾
Receive
All modes	PHY_CONFIG_RX_DLL_DELAY_FLD	⁽²⁾

(1) Transmit DLL delay value determined by training software

(2) Receive DLL delay value determined by training software

Table 6-87 OSPI0 Timing Requirements – PHY Data Training see Figure 6-102, and Figure 6-103

NO.			MODE	MIN	UNIT
O15	t_su(D-LBCLK)	Setup time, OSPI0_D[7:0] valid before active OSPI0_DQS edge	DDR with DQS	⁽¹⁾	ns
O16	t_h(LBCLK-D)	Hold time, OSPI0_D[7:0] valid after active OSPI0_DQS edge	DDR with DQS	⁽¹⁾	ns
O21	t_su(D-LBCLK)	Setup time, OSPI0_D[7:0] valid before active OSPI0_DQS edge	SDR with Internal PHY Loopback	⁽¹⁾	ns
O22	t_h(LBCLK-D)	Hold time, OSPI0_D[7:0] valid after active OSPI0_DQS edge	SDR with Internal PHY Loopback	⁽¹⁾	ns
	t_DVW	Data valid window (O15 + O16)	1.8V, DDR with DQS	1.4	ns
	t_DVW	Data valid window (O21 + O22)	1.8V, SDR with Internal PHY Loopback	1.7	ns

(1) Minimum setup and hold time requirements for OSPI0/1_D[7:0] inputs are not defined when Data Training is used to find the optimum data valid window. The t_DVW parameter defines the minimum data invalid window required. This parameter is provided in lieu of minimum setup and minimum hold times, where it must be used to check compatibility with the data valid window provided by an attached device.

AM68A AM68 OSPI0/1 Timing Requirements – PHY Data Training, DDR with DQS

Figure 6-102 OSPI0/1 Timing Requirements – PHY Data Training, DDR with DQS

AM68A AM68 OSPI0/1 Timing Requirements – PHY Data Training, SDR with Internal PHY Loopback

Figure 6-103 OSPI0/1 Timing Requirements – PHY Data Training, SDR with Internal PHY Loopback

Table 6-88 OSPI/1 Switching Characteristics – PHY Data Training See Figure 6-104 and Figure 6-105

NO.	PARAMETER		MODE	MIN	MAX	UNIT
O1	t_c(CLK)	Cycle time, OSPI0/1_CLK	1.8V, DDR	6.0	6.0	ns
O7	t_c(CLK)	Cycle time, OSPI0/1_CLK	1.8V, SDR	6.0	6.0	ns
O2	t_w(CLKL)	Pulse duration, OSPI0/1_CLK low	DDR	((0.475P⁽¹⁾) - 0.3)		ns
O8	t_w(CLKL)	Pulse duration, OSPI0/1_CLK low	SDR	((0.475P⁽¹⁾) - 0.3)		ns
O3	t_w(CLKH)	Pulse duration, OSPI0/1_CLK high	DDR	((0.475P⁽¹⁾) - 0.3)		ns
O9	t_w(CLKH)	Pulse duration, OSPI0/1_CLK high	SDR	((0.475P⁽¹⁾) - 0.3)		ns
O4	t_d(CSn-CLK)	Delay time, OSPI0/1_CSn[3:0] active edge to OSPI0/1_CLK rising edge	DDR	((0.475P⁽¹⁾) + (0.975M⁽²⁾R⁽⁴⁾) + (0.028TD⁽⁵⁾) - 1)	((0.525P⁽¹⁾) + (1.025M⁽²⁾R⁽⁴⁾) + (0.055TD⁽⁵⁾) + 1)	ns
O10	t_d(CSn-CLK)		SDR	((0.475P⁽¹⁾) + (0.975M⁽²⁾R⁽⁴⁾) + (0.028TD⁽⁵⁾) - 1)	((0.525P⁽¹⁾) + (1.025M⁽²⁾R⁽⁴⁾) + (0.055TD⁽⁵⁾) + 1)	ns
O5	t_d(CLK-CSn)	Delay time, OSPI0/1_CLK rising edge to OSPI0/1_CSn[3:0] inactive edge	DDR	((0.475P⁽¹⁾) + (0.975N⁽³⁾R⁽⁴⁾) - (0.055TD⁽⁵⁾) - 1)	((0.525P⁽¹⁾) + (1.025N⁽³⁾R⁽⁴⁾) - (0.028TD⁽⁵⁾) + 1)	ns
O11	t_d(CLK-CSn)		SDR	((0.475P⁽¹⁾) + (0.975N⁽³⁾R⁽⁴⁾) - (0.055TD⁽⁵⁾) - 1)	((0.525P⁽¹⁾) + (1.025N⁽³⁾R⁽⁴⁾) - (0.028TD⁽⁵⁾) + 1)	ns
O6	t_d(CLK-D)	Delay time, OSPI0/1_CLK active edge to OSPI0/1_D[7:0] transition	DDR	⁽⁶⁾	⁽⁶⁾	ns
O12	t_d(CLK-D)		SDR	⁽⁶⁾	⁽⁶⁾	ns
	t_DIVW	Data invalid window (O6 Max - Min)	DDR		1	ns
	t_DIVW	Data invalid window (O12 Max - Min)	SDR		1	ns

(1) P = SCLK cycle time in ns = OSPI0_CLK cycle time in ns

(2) M = OSPI_DEV_DELAY_REG[D_INIT_FLD]

(3) N = OSPI_DEV_DELAY_REG[D_AFTER_FLD]

(4) R = reference clock cycle time in ns

(5) TD = PHY_CONFIG_TX_DLL_DELAY_FLD

(6) Minimum and maximum delay times for OSPI0_D[7:0] outputs are not defined when Data Training is used to find the optimum data valid window. The t_DIVW parameter defines the maximum data invalid window. This parameter is provided in lieu of minimum and maximum delay times, where it must be used to check compatibility with the data valid window requirements of an attached device.

AM68A AM68 OSPI0/1 Switching Characteristics – PHY DDR Data Training

Figure 6-104 OSPI0/1 Switching Characteristics – PHY DDR Data Training

AM68A AM68 OSPI0/1 Switching Characteristics – PHY SDR Data Training

Figure 6-105 OSPI0/1 Switching Characteristics – PHY SDR Data Training