GS3590 datasheet(67/118 Pages) SEMTECH

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GS3590

Final Data Sheet Rev.4



PDS-061414 September 2017

67 of 118

Semtech

Proprietary & Confidential

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4.10.7 Single Read/Write Access

Single read/write access timing for the GSPI interface is shown in Figure 4-28 to



Figure 4-32.

When performing a single read or write access, one Data Word is read from/written to

the device per access. Each access is a minimum of 48-bits long, consisting of two

Command Words and a single Data Word. The read or write cycle begins with a

HIGH-to-LOW transition of the CS pin. The read or write access is terminated by a

LOW-to-HIGH transition of the CS pin.

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

indicated in the figures as tcmd, is a minimum of 3 SCLK clock cycles. After modifying

values in CONTROL_REG, the inter-command delay time, tcmd_GSPI_config, is a minimum

of 4 SCLK clock cycles.

For read access, the time from the last bit of Command Word 2 to the start of the data

output, as defined by t5, corresponds to no less than 4 SCLK clock cycles at 27MHz.

Figure 4-28: GSPI Write Timing—Single Write Access with Loop-Through Operation (default)

Figure 4-29: GSPI Write Timing—Single Write Access with GSPI Link-Disable Operation

Figure 4-30: GSPI Write Timing—Single Write Access with Bus-Through Operation

Figure 4-31: GSPI Read Timing—Single Read Access with Loop-Through Operation (default)

SCLK

SDIN

SDOUT

COMMAND WORD 1

DATA WORD

COMMAND WORD 1

cmd

COMMAND WORD 2

SCLK

SDIN

SDOUT

COMMAND WORD 1

DATA WORD

COMMAND WORD 1

cmd

COMMAND WORD 2

SCLK

SDIN

SDOUT

COMMAND WORD 1

High-Z

DATA WORD

COMMAND WORD 1

High-z

cmd

COMMAND WORD 2

SCLK

SDIN

SDOUT

COMMAND WORD 1

DATA WORD

COMMAND WORD 2

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