GS6150 Datasheet, PDF (38/64 Pages) Gennum Corporation – Automatic or Manual Rate Selection

SCLK
CS
SDIN
SDOUT
COMMAND
DATA 1
DATA 2
Figure 4-17: GSPI Write Timing – Auto-Increment with GSPI Link Disable Operation
SCLK
CS
SDIN
SDOUT ^High-Z
COMMAND
COMMAND
DATA 1
DATA 1
DATA 2
DATA 2
Figure 4-18: GSPI Write Timing – Auto-Increment with Bus-Through Operation
SCLK
CS
SDIN
t₅
COMMAND
SDOUT
COMMAND
DATA 1
DATA 2
Figure 4-19: GSPI Read Timing – Auto-Increment Read with Loop-Through Operation (default)
SCLK
CS
t₅
SDIN
COMMAND
SDOUT ^High-z
COMMAND
X
DATA 1
DATA 2
Figure 4-20: GSPI Read Timing – Auto-Increment Read with Bus-through Operation
4.11.9 Setting a Device Unit Address
Multiple (up to 32) GS6150 devices can be connected to a common Chip Select (CS) in
Loop-Through or Bus-Through operation.
To ensure that each device selected by a common CS can be separately addressed, a
unique Unit Address must be programmed by the host processor at start-up as part of
system initialization or following a device reset.
Note: By default at power up or after a device reset, the DEVICE_UNIT_ADDRESS of each
device is set to 0h and the SDIN->SDOUT non-clocked loop-through for each device is
enabled.
These are the steps required to set the DEVICE_UNIT_ADDRESS of devices in a chain to
values other than 0:
1. Write to Unit Address 0 selecting HOST_CONFIG (ADDRESS = 0), with the
GSPI_LINK_DISABLE bit set to 1 and the DEVICE_UNIT_ADDRESS field set to 0. This
disables the direct SDIN->SDOUT non-clocked path for all devices on chip select.
GS6150
Final Data Sheet
PDS-060127
Rev.2
March 2015
www.semtech.com
38 of 64
Proprietary & Confidential