User's Manual

FLC-BTM101 Datasheet

Flaircomm Microelectronics Confidential

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Figure 3: Example of an I

C Interface EEPROM Connection

5.3 SPI Master Interface

BTM101 provides a SPI interface to connect an external serial flash memory. The SPI master

memory interface in the BTM101 is overlaid on the I

C interface and uses a further 3 PIOs for the

extra pins, see Table 6.

SPI Interface

Flash_VDD

PIO[2]

SF_DIN

PIO[3]

SF_CS#

PIO[4]

SF_CLK

I2C_SCL

SF_DOUT

I2C_SDA

Table 6: SPI Master Serial Flash Memory Interface

Note:

If an application using BTM101 is designed to boot from SPI serial flash, it is possible for the

firmware to map the I

C interface to alternative PIOs.

The boot-up sequence for BTM101 is controlled by hardware and firmware. Figure 4 shows the

sequence of loading RAM with content from RAM, EEPROM and SPI serial flash.