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Philips SACD 1000/001 Service Manual Page 99

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9.24 Description of Furore IC
9.24.1 General Description
FURORE-IC is a one-chip design containing all the hardware
required for SACD processing. It is intended to interface to
the Sti family (Sti5505/Sti5508) DVD video decoders.
The FURORE-IC contains a memory interface to support one
4M*16 SDRAM or one 1M*16 SDRAM device.
9.24.2 Blockdiagram
ad(6:0)
8 bits
AGC
AD
HF
PSP-key
BE-
decoder
I/F
Key
Control
Decryption
/
I2S
Sector
Processor
PI-Bus
Control
SSM
9.24.3 Basic Engine Interface
Data input interface.
The Basic Engine Interface is connected to the output of the
SAA7335 (HD61)
Analogue HF input
The analogue HF input, coming from the optical pickup unit,
is also fed to the Furore IC to extract the copyprotection
information "PSP".
9.24.4 SDRAM Interface
The SDRAM interface forms a glueless interface to one
16Mbit or one 64 Mbit SDRAM device.
The interface takes care for the power-up sequence, mode
programming and refreshing of the SDRAM devices. This is
hard coded in the interface and doesn't have to be controlled
by the host.
9.24.5 Audio data input/output Interface
DSD/PCM combined data output.
DSD_PCM : Output intended for a combined 6 channel DSD
( SACD ) and PCM ( DVD-CDDA) DAC. Switching between
the PCM data coming from the Sti5505 and the internal
generated DSD signals is done in the Furore IC.
Circuit-, IC descriptions and list of abbreviations
To Host
(ST5505 or ST5508)
gp_out
Host interface
Memory
manager
PI-bus
Demux
SACD
Audio
interface
SDRAM
sys_clk
interface
sys_clk
to 16 Mbit
SDRAM
gp_in
Register
Host
6 channel
interface
mix
2 -5 -6 ch
6 channel
LossLess
6
fade
decoder
384 * fs
Post processing
LLD
384 * fs
clk_256_sacd
clk_256_dvd
Figure 9-7
Stereo DSD only output.
DSD_stereo: 2 channel DSD output, with stereo down mix in
the case of 5 and 6 channel and normal stereo in case of 2
channel DSD mode.
Stereo PCM data output.
Two possible stereo sources can be selected as stereo PCM
output:
Stereo PCM coming from the Sti5505 via the PCM input
on Furore.
Stereo or down mix PCM derived via a decimation filter
from the SACD-DSD signal.
Digital audio output interface (IEC958)
The IEC958 format is intended to connect the SACD 1000 to
a digital receiver. No DSD signals are defined for IEC958
therefore the DSD-->PCM converted signal will be
transmitted. Following two types of signals are possible on
the digital interface:
IEC958 data coming from Sti5505.
IEC958 data, Stereo or down mix PCM, derived via a
decimation filter from the SACD-DSD signal.
Clock + reset input.
Two different processing clocks are needed in the FURORE-
IC:
Sys_clk: System clock for data processing part,
frequency can be 27 MHz or 768 * Fs.
384 * Fs: Processing clock for LLD and postprocessing.
SACD 1000
IEC958
from Sti
S
e
l.
IEC958
gen
DSD to
PCM
dsd_mute
3
conversion
I2S-LR +
mute
4
L/R/C
clk_gen
3
6 * DSD
switch
6
matrix
6
5
PCM from Sti
5505
9.
GB 143
DSD_str
S
IEC958
e
l.
S
e
PCM data
l.
5
to
9
DSD/PCM
DAC
CL 06532152_098.eps
131200

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