SDA9251-2X Infineon Technologies Corporation, SDA9251-2X Datasheet - Page 23

• Manufacturer Part Number: SDA9251-2X
• Description: Dynamic Sequential Access Memory For Television Applications (tv-sam)
• Manufacturer: Infineon Technologies Corporation

Typical Application
Digital Storage of a TV Field
As standard for digital TV systems, CCIR recommendation 601 defines a field of 288 lines with 720
pixels per line.
The sampling frequency is 13.5 MHz with a resolution of 8 bit per pixel.
Information is stored in 3 different channels: one channel for luminance (Y), two channels for
chrominance (U and V).
The bandwidth ratio between the different channels is either Y:U:V = 4:1:1, 4:2:2 or 4:4:4 depending
on the coding method.
HDTV will have a sampling frequency of 54 MHz.
The following tables show the memory requirements for the field buffer and the number of memory
chips when the SDA 9251 is used.
Table 1
Memory Requirements for the Digital TV-Field Buffer
Y:U:V
4:1:1
4:2:2
4:4:4
Table 2
Number of Required Memory Devices in the Field Buffer when Using the SDA 9251
Y:U:V
4:1:1
4:2:2
4:4:4
Semiconductor Group
13.5 MHz
2.37 Mbit
3.16 Mbit
4.75 Mbit
13.5 MHz
3
4
6
Clock Rate
Clock Rate
181
54 MHz
12.66 Mbit
18.98 Mbit
54 MHz
12
16
24
9.49 Mbit
Bus Width
12 bit
16 bit
24 bit
Bus Width
12 bit
16 bit
24 bit
SDA 9251-2X