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EBK-GS3140-00 Datasheet(PDF) 29 Page - Semtech Corporation |
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EBK-GS3140-00 Datasheet(HTML) 29 Page - Semtech Corporation |
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29 / 40 page  GS3140 Final Data Sheet Rev.1 PDS-060939 May 2015 29 of 40 Semtech Proprietary & Confidential www.semtech.com Read access is the same as the above except in step 1 the Command Word is set for read access (R/W = 1). Note: The UNIT ADDRESS field of the Command Word must always match DEVICE_UNIT_ADDRESS for an access to be accepted by the device. Changing DEVICE_UNIT_ADDRESS to a value other than 0 is only required if multiple devices are connected to a single chip select (in Loop-Through or Bus-Through configuration). 4.11.10 Setting a Device Unit Address Multiple (up to 32) GS3140 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_CONF_REG_0 (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. 2. Write to Unit Address 0 selecting HOST_CONF_REG_0 (ADDRESS = 0), with the GSPI_LINK_DISABLE bit set to 0 and the DEVICE_UNIT_ADDRESS field set to a unique Unit Address. This configures DEVICE_UNIT_ADDRESS for the first device in the chain. Each subsequent such write to Unit Address 0 will configure the next device in the chain. If there are 32 devices in a chain, the last (32nd) device in the chain must use DEVICE_UNIT_ADDRESS value 0. 3. Repeat step 2 using new, unique values for the DEVICE_UNIT_ADDRESS field in HOST_CONF_REG_0 until all devices in the chain have been configured with their own unique Unit Address value. Note: tcmd_GSPI_conf delay must be observed after every write that modifies HOST_CONFIG_REG_0. All connected devices receive this command (by default the Unit Address of all devices is 0), and the Loop-Through operation will be re-established for all connected devices. Once configured, each device will only respond to Command Words with a UNIT ADDRESS field matching the DEVICE_UNIT_ADDRESS in HOST_CONF_REG_0 Note: Although the Loop-Through and Bus-Through configurations are compatible with previous generation GSPI enabled devices (backward compatibility), only devices supporting Unit Addressing can share a chip select. All devices on any single chip select must be connected in a contiguous chain with only the last device's SDOUT connected to the application host processor. Multiple chains configured in Bus-Through mode can have their final SDOUT outputs connected to a single application host processor input. |
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