GS6150 Datasheet, PDF (37/64 Pages) Gennum Corporation – Automatic or Manual Rate Selection

SCLK
t₅
CS
SDIN
COMMAND
SDOUT
COMMAND
DATA
Figure 4-14: GSPI Read Timing – Single Read Access with Loop-Through Operation (default)
t₅
SCLK
CS
SDIN
COMMAND
High-z
SDOUT
COMMAND
X
DATA
High-z
Figure 4-15: GSPI Read Timing – Single Read Access with Bus-Through Operation
4.11.8 Auto-increment Read/Write Access
Auto-increment read/write access timing for the GSPI interface is shown in Figure 4-16
to Figure 4-20.
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 maximum interface clock rate is 27MHz and the inter-command delay time
indicated in the diagram as t_cmd, is a minimum of 4 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 5 SCLK cycles at
27MHz. All subsequent read data accesses will not be subject to this delay during an
Auto-Increment read.
SCLK
CS
SDIN
SDOUT
COMMAND
COMMAND
DATA 1
DATA 1
DATA 2
DATA 2
Figure 4-16: GSPI Write Timing – Auto-Increment with Loop-Through Operation (default)
GS6150
Final Data Sheet
PDS-060127
Rev.2
March 2015
www.semtech.com
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