Sony DVP-NS300 Training Manual page 18

IC404
IFCON
XIFCS
XIFBSY
XFRST
78 26
Pcont
Ever +3,3 V
Plug-In
Start
Red LED
Serial Data Communications after Power ON
The serial data bus connects several ICs and consists of two or three lines. Serial data is transmitted from one
IC to another on a unidirectional line (arrows shown in one direction). This data is accompanied by a clock signal
for a total of two lines in a unidirectional serial communication. The interface control IC404 and syscon IC104
communicate bidirectionally (arrows shown in two directions). Three lines are necessary when bi-directional
transmissions are used. There is a data line for each direction. The additional clock signal makes a total of three
lines for a bi-directional serial bus. The clock signal usually comes from the controlling micro, which in this case
is syscon IC104.
IC104 communications with interface IC404, EEProm IC101, SACD decoder IC806, SACD bass management
IC807 and DSP IC601 are bi-directional.
Syscon communications to the Digital to Analog Converters (DAC) IC603, IC604 are uni-directional.
5
16
SI0
4
SO0
15
3
SC0
17
14
2
27
1
7
6
IFCONàSYSCON
INT
FIGURE 3-7 - PLUG IN SEQUENCE
User Commands
Display Update
Serial Clock
Chip Select
Interrupt
Stop
SYSCONàIFCON
Clock/Data
Green LED
1.3 Seconds
16
3. Power Supply
25
IC103/4
26
SYSCON
17
51
20
INT4
76 3.3v
IFCONàSYSCON
XFRST
Red LED
Std-By
End