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參數(shù)資料
| 型號(hào)： | ZR36506 |
| 英文描述： | Fast Recovery Rectifier Diodes |
| 中文描述： | 外圍芯片 |
| 文件頁數(shù)： | 58/99頁 |
| 文件大?。?/td> | 452K |
| 代理商： | ZR36506 |
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Zoran ZR36506 USBV ision – Datasheet
Zoran Proprietary and Confidential
9-2
SDRAM Control and Interface
The MAU performs the following tasks:
§
Read data from SDRAM to USB Fifo
The Universal Serial Bus can transfer 12 Mbits/sec – while this is considered the USB peak-
rate, the maximum average rate that can be used for video data is approximately 8 Mbits/sec
(Iso 1023 bytes every 1ms). The MAU performs an 8-word Read operation to fill the USB
Fifo. This lasts about 340 ns, and is expected to be performed every 10.6 us on average
(assuming continuous 12 Mbit/sec demand).
§
Read & Write data from/to SDRAM to obtain one video-frame delay
The video source for this operation is the reconstructed image from the Digital Video
Compressor (DVC), and its timing is derived from the Digital Video Scaler (DVS) output.
There are two FIFOs for this task in the DVC - one for Write to SDRAM operations and one
for Read from SDRAM operations. The data that is written to SDRAM from the Write Fifo
is read back from SDRAM to the Read Fifo after a delay of approximately one video frame.
This task is active only in Compressed Video mode, and its video format is always 4:2:0
(12 bits/pxl). The pixel rate is 12.2727 MHz for NTSC and 14.75 MHz for PAL (or
9.545454 MHz and 14.31818 MHz in Sanyo cameras), so the maximum rate in 16-bit words
is approximately 11.0625 Mw/sec for PAL when full frame-size is used. In all these
systems, the active line lasts within 53 us, followed by a 10-11 us blank with no activity.
The MAU uses 32-word Page-Read and 32-word Page-Write operations to perform the
transfer. This lasts approximately 1600 ns, and is expected to be performed every 2893 ns in
worst cases (at rates of 11.0625 Mw/sec).
§
Write output video-data to SDRAM
This is the same data that is later on read back into the USB Fifo. The source for this data is
the Video Data Buffer which is located in the DVC (Digital Video Compressor). When
operating in Compressed Video mode, the Video Data Buffer is first filled with compressed
data of at least one video frame line (one line for full-frame size, and additional lines for
small frame sizes). This takes place during the active-line time interval, so that the Video
Data Buffer is ready to be transferred to SDRAM when the video blank time interval begins.
The blank time-interval lasts approximately 10 us, and during this time the MAU writes up
to 384 words to SDRAM, using Page-Write mode. The MAU uses a Page-Write operation,
which lasts approximately 8400 ns (if N=384 in worst cases, where the MAU encounters
end of 256-word SDRAM line twice during the burst). When operating in Raw Video mode,
the Video Data Buffer is split into two 192-word buffers. At the same time that one buffer is
being filled with Raw video data (this time arriving from the DVS), the other buffer is being
transferred to SDRAM. This process is carried out during the active-line time, as well as
during the blank time - whenever there is data ready to be written to SDRAM. Residual data
is transferred at the end of the video frame.
§
SDRAM Refresh
A refresh operation lasts 60 ns and uses Auto Refresh. The ASIC supports both 8.2 ms and
16 ms refresh SDRAMs (32 ms, 2048-cycle refresh or 64 ms, 2048-cycle refresh). 8 ms rate
produces a 32 mS x 2048 cycle refresh (15.625 uS between refresh tasks), while 16 ms rate
produces a 64 mS x 2048 cycle refresh (31.25 uS between refresh tasks).
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