mx8810 Macronix International Co., mx8810 Datasheet - Page 14

• Manufacturer Part Number: mx8810
• Description: Motion-jpeg
• Manufacturer: Macronix International Co.

P/N:PM0363
5-3-2. Raster Block Convert I/F
5-3-3. Compression Data I/F
The I/O of control signal (address, write enable, output enable) and bidirection data to external memory.
Use SRAM to be an external memory, the direct connection is possible.
(e.g. refer " 6-1, External memory for raster block")
The Input/Output of compression data in synchronous mode or DMA mode.
• Synchronous mode
32 bits bus width.
Compression: If CVALID = "H", compression data is exported. Refer when CLK is active.
Moreover, DTENDB and each image's last compression data will be exported at the same time.
Decompression: When CREQ = "H" and CLK is active, compression data access busy.
• DMA mode
16 bits bus width or 32 bits bus width.
In case of 16 bits, CDATA15 ~ CDATA0 are I/O of compression data.
(CDATA31 ~ CDATA16 are used as pull up or pull down)
Compression:
1) Read access
2) DMA demand
3) DMA burst
Deompression:
1) Write access
No matter DMAREQB is L or H, Set DMAWRB "L" and confirm WAITB = "H", then write compression data
while DMAWRB is active.
2) DMA demand
Set DMAWRB "L" when DMAREQB = "L", then write compression data while DMAWRB is active.
When DMAREQB = "H", write will not be executed.
3) DMA burst
Begin to write when DMAREQB = "L", if WAITB = "L"
DMAWRB keeps "L" untill WAITB changes to "H".
No matter DMAREQB is L or H, Set DMARDB "L" and confirm
WAITB = "H", then refer to valid compression data while DMARDB is active.
Set DMARDB "L" when DMAREQB = "L", then refer valid compression data while DMARDB is active.
When DMAREQB = "H", read will not be executed.
Begin to read when DMAREQB = "L", if WAITB = "L" DMARDB keeps "L" untill WAITB changes to "H".
When DTENDB change to "L", reading stop.
14
MX8810
REV. 1.0, AUG. 25, 1998
INDEX