** Locate the three 0.10µF decoupling
capacitors as close as possible to the
corresponding pins on the GS9000D.
Chip capacitors are recommended.
+5V
22µ
1
3 x 100n
HSYNC OUTPUT
**
12
13 18
V
V
V
HSYNC
PD0
DD DD DD
17
19
20
21
PARALLEL DATA BIT 0
PARALLEL DATA BIT 1
PARALLEL DATA BIT 2
PARALLEL DATA BIT 3
PARALLEL DATA BIT 4
PARALLEL DATA BIT 5
PARALLEL DATA BIT 6
PARALLEL DATA BIT 7
PARALLEL DATA BIT 8
PARALLEL DATA BIT 9
PARALLEL CLOCK OUT
SYNC CORRECTION ENABLE
DECODER
GS9000D
PDI
PD2
PD3
PD4
PD5
PD6
PD7
PD8
PD9
PCLK
5
6
SDI
SDI
SDI
SCI
SCI
IN
IN
IN
IN
SDI
SCI
SCI
SS1
SS0
SSC
7
8
9
22
23
24
STANDARDS SELECT BIT 1
STANDARDS SELECT BIT 0
10
11
25
27
28
16
14
+5V
100k
820p
SCE
SWC SWF
V
V
V
SS SS SS
4
2
26 15
3
10p
SYNC WARNING FLAG
13 x 425
39k
All resistors in ohms,
all capacitors in farads,
unless otherwise specified.
+5V
Fig. 8 GS9000D Test Set-Up
With synchronized serial data and clock connected to the
GS9000D, the HSYNC output (pin 1) will toggle for each
HSYNC detected. The Parallel Data bits PD0 through PD9
and the Parallel Clock can be observed on an oscilloscope
or fed to a logic analyzer. To directly drive parallel inputs to
receiving equipment, such as monitors or digital to analog
converters, these outputs can be fed through a suitable TTL
to ECL converter.
The HSYNC output toggles to indicate the presence of the
TRS on the falling edge of PCLK, one data symbol prior to
the output of the first word in the TRS. In the following
diagram, data is indicated in 10-bit Hex.
PCLK
XXX 3FF 000 000 XXX
XXX 3FF 000 000 XXX
PDN
In operation, the HSYNC output from the GS9000D decoder
toggles on each occurrence of the timing reference signal
(TRS). The state of the HSYNC output is not significant, but
the time at which it toggles is significant.
HSYNC
Fig. 10 Operation of HSYNC with Respect to PCLK
4ƒ
DATA
STREAM
T
R
S
T
R
S
T
R
S
SC
ACTIVE VIDEO
& H BLANKING
ACTIVE VIDEO
& H BLANKING
HSYNC
OUT
4:2:2
DATA
STREAM
E
A
V
E
S
A
V
S
A
V
H
BLNK
H
BLNK
ACTIVE
VIDEO
A
V
HSYNC
OUT
Fig. 9 Operation of HSYNC Output
7 of 9
GENNUM CORPORATION
18784 - 3
GENNUM [ GENNUM CORPORATION ]
