GS3470 datasheet(95/169 Pages) SEMTECH

95 / 169 page

GS3470

Final Data Sheet

Rev.8

PDS-060500

September 2017

95 of 169

Semtech

www.semtech.com

Figure 4-58: GSPI Read Timing – Single Read Access with Loop-Through Operation (default)

Figure 4-59: GSPI Read Timing – Single Read Access with Bus-Through Operation

4.20.8 Auto-Increment Read/Write Access

Auto-increment read/write access timing for the GSPI interface is shown in Figure 4-60

to Figure 4-64.

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

Word.

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 a Command Word 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 HOST_CONFIG using Auto-increment access is not allowed.

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 first 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. All

subsequent read data accesses will not be subject to this delay during an

Auto-Increment read.

Figure 4-60: GSPI Write Timing – Auto-Increment with Loop-Through Operation (default)

SCLK

SDIN

SDOUT

COMMAND

DATA

SCLK

SDIN

SDOUT

COMMAND

DATA

High-z

SCLK

SDIN

SDOUT

COMMAND

DATA 1

DATA 2

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