Functional Overview
36
November 2002 − Revised January 2005SPRS205D
3.1.5 Boot Configuration
The on-chip bootloader provides a method to transfer application code and tables from an external source to
the on-chip RAM memory at power up. These options include:
• Enhanced host-port interface (HPI) in multiplexed or nonmultiplexed mode
• External asynchronous memory boot (via the EMIF) from 8-bit-wide or 16-bit-wide memory
• Serial port boot (from McBSP0) with 8-bit or 16-bit data length
• Serial EPROM boot (from McBSP0) supporting EPROMs with 16-bit or 24-bit address
• USB boot
• I
2
C EEPROM
• Direct execution from external 16-bit-wide asynchronous memory
External pins select the boot configuration. The values of GPIO[3:0] are sampled, following reset, upon
execution of the on-chip bootloader code. It is not possible to disable the bootloader at reset because the
5509A always starts execution from the on-chip ROM following a hardware reset. A summary of boot
configurations is shown in Table 3−3. For more information on using the bootloader, see the Using the
TMS320VC5503/VC5507/VC5509/VC5509A Bootloader Application Report (literature number SPRA375).
Table 3−3. Boot Configuration Summary
GPIO0 GPIO3 GPIO2
GPIO1
BOOT MODE PROCESS
0 0 0 0 Reserved
0 0 0 1 Serial (SPI) EPROM Boot (24-bit address) via McBSP0
0 0 1 0 USB
0 0 1 1 I
2
C EEPROM (7-bit address)
0 1 0 0 Reserved
0 1 0 1 HPI – multiplexed mode
0 1 1 0 HPI – nonmultiplexed mode
0 1 1 1 Reserved
1 0 0 0 Execute from 16-bit-wide asynchronous memory (on CE1 space)
1 0 0 1 Serial (SPI) EPROM Boot (16-bit address) via McBSP0
1 0 1 0 8-bit asynchronous memory (on CE1 space)
1 0 1 1 16-bit asynchronous memory (on CE1 space)
1 1 0 0 Reserved
1 1 0 1 Reserved
1 1 1 0 Standard serial boot via McBSP0 (16-bit data)
1 1 1 1 Standard serial boot via McBSP0 (8-bit data)
