CS49310 datasheet(59/86 Pages) CIRRUS

59 / 86 page

CS49300 Family DSP

DS339PP4

(from the rising edge of RESET). Note: This time

has been tested using the ac3_493263_13.ld

application code release, however other application

code releases MAY take longer than 200mS as they

have may an increased image size and may take

longer to initialize all of the internal state variables.

It is up to the designer to verify the actual times

required for each application code in their system.

8.3. Decreasing Autoboot Times Using

GFABT Codes (Fast Autoboot)

Instead the host toggling the RESET line while

ABOOT is held low, the host decrease the

Autoboot download time by instead downloading a

special code called “GFABT” (Genesis

Fast

Autoboot) which first speeds up the DSP’s core

clock, and then automatically causes the DSP to

Autoboot itself from external ROM.

Basically, the host should perform a normal serial

host boot with one of the GFABT codes (gfabt8.ld,

gfabt6.ld or gfabt4.ld) as described in Section

8.1.1, (with ABOOT held high).

Immediately

following the download of the GFABT code, the

DSP will start to act the exact same way as if the

host had toggled the RESET line with ABOOT

held low, only now, the code image held in the

external flash or eprom page will now be

downloaded anywhere from 1.5 to 3 times faster

than using Autoboot, depending on the gfabt code

that was first downloaded.

The normal DSP clock divide factor during

Autoboot is 12 (VCO open loop frequency

divider). The gfabt8.ld code changes that divide

factor to 8, the gfabt6.ld code changes it to 6, and

the gfabt4.ld code changes it to 4. Contact your

FAE in order to obtain these gfabt codes.

Some sample data for various autoboot times can

seen

below

Table 11

using

the

ac3_pl2_reeq_493264_08.ld application code. It

shows that the autoboot times after downloading

gfabt8.ld,

gfabt6.ld,

and

gfabt4.ld

are

approximately 1.5, 2, and 3 times faster than a

standard autoboot. The typical autoboot time listed

in the datasheet of 200 ms will therefore become

135 ms (200ms/1.5), 100ms (200ms/2), and 70ms

(200/3) with gfabt8, 6, and 4, respectively.

Open Loop

VCO

Standard Autoboot Times

GFABT4.LD

GFABT6.LD

GFABT8.LD

Application

Code Name

(8.3 File Name)

ac3_pl~1.ld

dts_6d~1.ld

eff_49~1.ld

ac3_pl~1.ld

Application

Code Name

(Long File

Name)

ac3_pl2_

reeq_

493264_

08.ld

dts_6dot1_

reeq_

493264_

04.ld

eff_4932xx

_14.ld

Code Size on

Disk

94 k

47 k

Code Size in

Bytes

24 k

12 k

Sample 1

12.5 MHz

98 ms

96 ms

48 ms

34 ms

50 ms

65 ms

Sample 2

12.4 MHz

99 ms

98 ms

50 ms

34 ms

50 ms

67 ms

Sample 3

11.7 MHz

97 ms

96 ms

48 ms

32 ms

50 ms

66 ms

Table 11. Reduced Autoboot Times using GFABT8.LD, GFABT6.LD, and GFABT4.LD on a CS493264-CL Rev. G DSP

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