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tusb9261: Programing option

Part Number: TUSB9261

hi team,

customer questions:
I have a question about TUSB9261 (USB-to-SATA-Bridge):

- What option is there for the customer to program the firmware into the external SPI flash?
o Is there another option besides JTAG?
 An option would be, for example, a 2: 1 multiplexer (CPU / TUSB9261-->  Flash)
o Is a JTAG chain (with an other JTAG-enabled ICs) allowed?

regards,

kamal