USBvision
TM
II Data Decoder
ZR36505
VBI Data and Remote Control Interface for ZR6504
Data Sheet
Revision 1.00
November 1999.
Zoran reserves the right to make changes without further notice to any product herein. Zoran makes no warranty,
representation or guarantee regarding the suitability of its products for any particular purpose, nor does Zoran assume
any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation consequential or incidental damages. Zoran products are not designed, intended, or
authorized for use as components in systems intended for surgical implant into the body, or other applications intended
to support or sustain life, or for any other application in which the failure of the Zoran product could create a situation
where personal injur y or death may occur.
ZORAN Corporation
USBvision II Data Decoder
ZR36505 Data Sheet
November-99
Page 2 of 2
Table of Contents:
1.
SERIAL CONTROL
............................................................................................................................ 7
2.
VBI DATA QUALIFIER
.................................................................................................................. 12
2.1
VBI Input Interface................................................................................................................................ 12
2.2
VBI Lines Qualifier................................................................................................................................. 13
2.3
VBI and IRD (Remote Control) Data Format...................................................................................... 17
3.
Bulk Interface
.......................................................................................................................................... 21
4.
Programmable I/O Pins
....................................................................................................................... 25
5.
Soft Reset operation
............................................................................................................................. 26
6.
Mechanical Specification
.................................................................................................................... 27
ZORAN Corporation
USBvision II Data Decoder
ZR36505 Data Sheet
November-99
Page 3 of 3
ZR36505 -
VBI (Teletext) pipe and Remote Control interface for USB TV applications
The ZR36505 is a complimentary chip for the
ZR36504
in USB TV applications. Combined with certain
video decoders, it adds a VBI (Vertical Blank Interval) data pipe to the system, which utilizes the general
purpose Bulk channel of the NT1004. The VBI is used by TV broadcast providers to send digital data
hidden in the analog video signal. One or more video lines, taken from lines 1-21 of each video field are
used for carrying this information - each line providing about 9,600 bits/sec data rate.
The ZR36505 provides the application S/W with access to data such as Teletext, Close-Caption,
Intercast, IR receiver samples, etc. It uses a 1KByte SRAM buffer to grabe the processed data from the
video decoder during the Blank Interval time slot, and sends this data to the USB through the
ZR36504
Bulk pipe during the time left prior to beginning of next Blak Interval. For the remote Control
interface, the input pin IO_1 is sampled at 4Ksamp/sec rate, and the sampled bits are moved to host
computer via the (NT1004) for S/W process.
Features
Enables Teletext and Close-Caption
Supports WST625, WST525, CC625, CC525, US NABTS, MOJI (Japanese), and JFS formats
Provides Remote Control interface with IR receiver (sampled at 4K samp./sec.)
Low Cost, Low Power, 3.3v operated
24-pin SOIC package
ZORAN Corporation
USBvision II Data Decoder
ZR36505 Data Sheet
November-99
Page 4 of 4
Product Description
Refer to Fig.1 for an internal Block Diagram of the ZR36505.
IIC
Serial Interface
ZR36505 CHIP
Control Registers
Status Registers
VBI DATA
QUALIFIER
BULK
INTERFAC
E
1KB
Buff
Prog.
I/O
to
ZR36504
Bulk pins
(0-2Mbps)
General
purpose
I/O pins
(Remote
Control,
IRD,
etc.)
from
ZR36504
Serial
Control
pins
from
Video
Decoder.
27MHz
48MHz
from
ZR36504
Remote Control
IR Binary Sampler
(4KHz)
Fig.1 ZR36505 Block Diagram
The IIC block uses the LRNACK mode of the ZR36504 serial control bus to provide
access to its internal registers. The address range for output registers and input registers is
0x00-0x07 each.
The internal Input and Output Registers are used by the Host (PC S/W via ZR36504) to
control the parameters of the ZR36505 blocks and to read their status. There are two
general I/O pins to be used by S/W for specific designs.
The VBI DATA QUALIFIER block can be programmed to restrict VBI data capture to
any specified range of lines within the video field. Also, a specific data type can be defined,
to filter out all other types of VBI data.
The 1KByte Buffer is used for capturing all VBI data from every coming video field (after
qualification), and sending it via the Bulk Interface. This is done for one field at a time, and
Write/Read cannot be done simultaneously.
The BULK INTERFACE block is designed to match the ZR36504 specification. It can
coexist with an audio Codec source to share the same clock and data pins of the NT1004.
Finally, The ZR36505 uses 2 clock sources: 27MHz for VBI data, and 48MHz (from
NT1004) for the other blocks. The ZR36505 does not require a crystal of its own.
ZORAN Corporation
USBvision II Data Decoder
ZR36505 Data Sheet
November-99
Page 5 of 5
Pin Assignments (Top View)
NT1005
USBTeletext
TM
VSYNC_IN
1
YIN0
2
YIN1
3
YIN2
4
YIN3
5
YIN4
6
YIN5
7
YIN6
8
YIN7
9
HSYNC_IN
10
CLK27
11
GND
12
24
23
22
21
20
19
18
17
16
15
14
13
VDD
IICCK
IICDT
IO1/IRD_IN
IO2
BCLK
FS_L
BLK_FULL
BLK_EN
DAT_OUT
GND
CLK48
Table 1 - PIN DESCRIPTIONS
PIN NUMBER
SIGNAL
I/O
DESCRIPTION
24
VDD
Digital 3.3V power supply
12, 14
GND
Digital ground connection
1
VSYNC_IN
I
Video Vertical-Sync input signal from Video Decoder
2
HSYNC_IN
I
Video Vertical-Sync input signal from Video Decoder
3-10
YIN0-YIN7
I
VBI data-bus from Video Decoder. Usually used also for delivering
the digital video samples.
11
CLK27
I
VBI clock from Video Decoder. Used to sample the VBI data in
its positive edge. This clock is used for capturing and storing the
VBI data.
13
CLK48
I
This is the ZR36505 Global clock, which comes from the
NT1004.
15
DAT_OUT
O
VBI Data Output pin, goes to DAT_IN pin of the
ZR36504(which is used for both Audio CODEC T x chan and
Bulk Data in This pin is Open Drain, and is set to high -z upon
Power-On or Soft Reset. It requires an external pull-up resistor.
16
BLK_EN
O
Bulk Data Enable output. When set to '1', Bulk output data at
DAT_OUT pin is sampled into the ZR36504by falling edge of
BCLK .
This pin is set to Hi-Z upon Power-On or Soft Reset.
17
BLK_FULL
I
"Bulk-Fifo full" indication signal from NT1004. This signal is
normally '0', and is set to '1' when the ZR36504Bulk -Fifo is full.
18
FS_L
I
Audio Codec Frame-Sync pulse for Left channel., which comes
from the NT1004. The ZR36505 uses this signal to trigger the
beginning of its VBI Bulk data output immediately after the 16th
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