GS3590 datasheet(68/118 Pages) SEMTECH

68 / 118 page

GS3590

Final Data Sheet Rev.4



PDS-061414 September 2017

68 of 118

Semtech

Proprietary & Confidential

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Figure 4-32: GSPI Read Timing—Single Read Access with Bus-Through Operation

4.10.8 Auto-increment Read/Write Access

Auto-increment read/write access timing for the GSPI interface is shown in Figure 4-33

to Figure 4-37.

Auto-increment mode is enabled by the setting the AUTOINC bit of Command Word 1.

In this mode, multiple Data Words can be read from/written to the device using only one

starting address. Each access is initiated by a HIGH-to-LOW transition of the CS pin, and

consists of two Command Words and one or more Data Words. The internal address is

automatically incremented after the first read or write Data Word, and continues to

increment until the read or write access is terminated by a LOW-to-HIGH transition of

the CS pin.

Note: Writing to CONTROL_REG using Auto-increment access is not allowed.

The maximum interface clock rate is 27MHz and the inter-command delay time

indicated in the diagram as tcmd, is a minimum of 3 SCLK clock cycles.

For read access, the time from the last bit of the second Command Word to the start of

the data output of the first Data Word as defined by t5 will be no less than 4 SCLK cycles

at 27MHz. All subsequent read data accesses will not be subject to this delay during an

Auto-Increment read.

Figure 4-33: GSPI Write Timing—Auto-Increment with Loop-Through Operation (default)

Figure 4-34: GSPI Write Timing—Auto-Increment with GSPI Link Disable

Operation

COMMAND WORD 1

COMMAND WORD 2

COMMAND WORD 1

COMMAND WORD 2

High-z

DATA WORD

SCLK

SDIN

SDOUT

SCLK

SDIN

SDOUT

COMMAND WORD 1

DATA 1

DATA 2

COMMAND WORD 2

SCLK

SDIN

SDOUT

COMMAND WORD 1

DATA 1

DATA 2

COMMAND WORD 2

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