Manual

Slave Boot Procedures

CS4953xx Hardware User’s Manual

The SPI clock is derived from the internal core clock. This clock can be divided down with the “c” 12-bit

divider variable. The command byte (the first byte to the SPI ROM) can be defined by the “s” variable. The

CS4953xx control port used for the HCMB_SPI can be configured by the ‘p’ variable. Finally, the “S”

variable configures the chip select used, according to Table 2-6 below.

2.3.3.5 Soft Reset

The SOFT_RESET message is the message sent to the CS4953xx after all of the overlays have been

successfully booted. The SOFT_RESET leaves execution of the bootloader and begins execution of the

loaded overlays. The overlays can be configured once the SOFT_RESET message has been sent.

2.3.3.6 Messages Read from CS4953xx

Table 2-8 defines the boot read messages, in mnemonic and actual hex value, used in CS4953xx boot

sequences.

Note: There is a unique {ID} for every .uld file.

Table 2-6. GPIO Pins Available as EE_CS in HCMB

‘S’ Value Pin Name

LQFP-144

Pin #

LQFP-128

Pin #

0GPIO20638

1GPIO231446

2GPIO2525 -

GPIO0

1.GPIO0 as EE_CS can be used to load only one

.uld in HCMB mode. If multiple .uld files are to be

loaded, do not use GPIO0 as EE_CS

in HCMB

Mode.

121 -

Table 2-7. SOFT_RESET message for CS4953xx

MNEMONIC VALUE

SOFT_RESET 0x4000 0000

SOFT_RESET_DSP_A 0x5000 0000

Table 2-8. Boot Read Messages from CS4953xx

MNEMONIC VALUE

BOOT_START 0x0000 0001

BOOT_SUCCESS 0x0000 0002

APP_START 0x0000 0004

BOOT_ERROR_CHECKSUM 0x0000 00FF

INVALID_BOOT_TYPE 0x0000 00FE

BOOT_FAILURE 0x0000 00F8

APPLICATION_FAILURE 0xF0{ID} 0000