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Technical Reference Manual
TMDXEVM6657L
SPRUHG7 - Revised August 2012
TMDXEVM6657LE
Page 28 / 90
2.6 I2C Boot EEPROM / SPI NOR Flash
The I2C modules on the TMS320C6657 may be used by the DSP to control local peripheral ICs (DACs, ADCs,
etc.) or may be used to communicate with other controllers in a system or to implement a user interface.
The I2C bus is connected to one EEPROM and to the 80-pin expansion header (TEST_PH1). There are two
banks in the I2C EEPROM which respond separately at addresses 0x50 and 0x51. These banks can be loaded
with demonstration programs. Currently, the bank at 0x50 contains the I2C boot code and PLL initialization
procedure and the bank at 0x51 contains the second level boot-loader program. The second level boot-loader
can be used to either run the POST program or launch the OOB demonstration from NOR flash memory.
The Serial Peripheral Interconnect (SPI) module provides an interface between the DSP and other SPI-compliant
devices. The primary intent of this interface is to allow for connection to a SPI ROM for boot. The SPI module on
TMS320C6657 is supported only in Master mode.
16MB NOR FLASH (part number N25Q032A11 from NUMONYX) is attached to CS0z on TMS320C6657. It
contains demonstration programs such as POST or OOB demo. The CS1z of SPI is used by the DSP to access
registers within FPGA.
DSP
(C6657)
SPI
16MB NOR Flash
(N25Q032A11ESE40F)
4
4
FPGA
XC3S200AN
80-pin Expansion
Header
4
CS1
CS0
4
CS1
Figure 2.4: C6657 Lite EVM Clock Domains
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