Parallel Data Communications - Sony DVP S530D Training Manual

Parallel Data Communications

There are six ICs that communicate with System Control IC202 on the
parallel bus:
ICs on the Parallel Bus
Name Number
1. Flash ROM IC205
2. Hybrid Gate IC601
Array
3. SRAM IC204
4. AV Decoder IC401
5. ARP2 IC303
6. Servo DSP IC701
Bi-directional communications between these ICs are accomplished us-
ing the following lines; however, not all ICs use the last three lines:
· Chip Select from IC202
· Address from IC202
· Data (bi-directional)
· Clock from IC202
· Interrupt from destination IC
· Read/Write from IC202
Chip Select Line
System Control IC202 systematically polls each IC on the communica-
tions bus with a chip select signal. This low or high going pulse identifies
the individual destination IC that System Control wants to communicate
with. The chip select output sequence is listed below:
Purpose
Start up program instructions
Expansion port for System Control
IC202
IC202's local memory
Audio (AC-3) and Video (MPEG 2)
decoder
CD/DVD data processing & separation
Analog servo control
27
Chip Select Signals from IC202 (active low)
CS Source
1. CS 1 - IC202/pin 10
2. CE – IC202/pin 11
3. CS 2 – IC202/pin 9
4. CS 4 – IC202/pin 7
5. CS 3 – IC202/pin 8
6. XCS – IC601/pin 111
7. HCS - IC601/pin 118
Chip Select Waveforms
The following waveforms show the chip select signals going to the S RAM
IC204 (ch 1) and AV Decoder IC401 (ch 2 and 3). They can be compared
to the D1 data (ch 4) to show that the chip select (ch 1-3) signals occupy
more than one bit clock interval. Note that on each of the CS 1 (ch 1) and
CS 2 (ch 2) lines, two different pulse widths are used. These waveforms
were taken with the unit on without a disc being played.
P M 3 3 9 4 , F L U K E & P H I L I P S
c h 1
c h 2
1
c h 3
T
2
c h 4
3
C H 1 ! 5 . 0 0 V =
C H 2 ! 5 . 0 0 V =
C H 3 ! 5 . 0 0 V =
4
C H 4 ! 2 . 0 0 V = A L T M T B 5 . 0 0 u s - 1 . 3 4 d v c h 2 -
Chip Select signals from IC202 (active low)
Name
Channel 1 CS = CS1
Channel 2 CS = CS2
Channel 3 CS = CS3
Channel 4 Data = D1
Time base
Destination
Width/Polarity
SRAM IC204 / 0.56us /–
HGA IC601 0.9usec/-
Flash ROM IC205 0.56us /–
AV Decoder IC401 0.7 & .26
usec/-
HGA IC601 0.3usec/-
AV Decoder IC401 1.2usec/-
ARP2 IC303 0.3usec/-
Servo IC701 0.3usec/-
Location Voltage/div
IC202/pin 10 5Vp-p
IC202/pin 9 5Vp-p
IC202/pin 8 5Vp-p
IC202/pin 26 2Vp-p
5usec/div.
Pulse