Method and/or apparatus for video data storage
An apparatus and method for storing image data comprising a first storage device and a second storage device. The first storage device may be configured to store at least one first pixel from a first field of a frame of the image at a first physical address in the first storage device. The second storage device may be configured to store a second pixel from a second field of the frame of the image at a second physical address in the second storage device. The first and second physical addresses may have the same relative position in an address space of the respective storage devices.
1. An apparatus comprising:
a first storage device;
a second storage device; and
a control circuit configured to generate addresses to read and write data in said first and said second storage devices, said control circuit presenting a first address signal and a second address signal to said first storage device, presenting a third address signal and a fourth address signal to said second storage device and presenting a plurality of fifth address signals to both said first and said second storage devices, wherein (i) said first address signal is presented as said third address signal and said second address signal is presented as said fourth address signal in a first mode, (ii) a complement of said first address signal is presented as said third address signal and said second address is presented as said fourth address signal in a second mode and (iii) said first address signal is presented as said third address signal and a complement of said second address signal is presented as said fourth address signal in a third mode.
2. The apparatus according to claim 1 , wherein said first and second storage devices are connected to share all but two address pins.
3. The apparatus according to claim 1 , wherein said first and second storage devices each comprise a plurality of memory chips connected in series.
4. The apparatus according to claim 1 , wherein said first mode comprises a frame read mode and said second mode comprises a field read mode.
5. The apparatus according to claim 1 , wherein said third mode comprises a line read mode.
6. The apparatus according to claim 1 , wherein said control circuit comprises a logic circuit configured to switch said third address signal between said first address signal and said complement of said first address signal in response to a control signal.
7. The apparatus according to claim 6 , wherein said control circuit further comprises a mode control circuit configured to generate said control signal based on the mode selected.
8. The apparatus according to claim 1 , wherein said control circuit comprises a logic circuit configured to (i) switch said third address signal between said first address signal and said complement of said first address signal and (ii) switch said fourth address signal between said second address signal and said complement of said second address signal in response to one or more control signals.
9. The apparatus according to claim 8 , wherein said control circuit further comprises a mode control circuit configured to generate said one or more control signals based on the mode selected.
10. The apparatus according to claim 8 , wherein a location of said fourth address signal and said second address signal in the addresses presented to said first storage device and said second storage device is based upon a burst length.
11. A method for loading image data comprising the steps of:
presenting a first address signal and a second address signal to a first storage device;
presenting a third address signal and a fourth address signal to a second storage device; and
presenting a plurality of fifth address signals to both said first and said second storage devices, wherein (i) said first address signal is presented as said third address signal and said second address signal is presented as said fourth address signal in a first mode, (ii) a complement of said first address signal is presented as said third address signal and said second address signal is presented as said fourth address signal in a second mode and (iii) said first address signal is presented as said third address signal and a complement of said second address signal is presented as said fourth address signal in a third mode.
12. The method according to claim 11 , wherein said first mode comprises a frame read mode, said second mode comprises a field read mode and said third mode comprises a line read mode.
13. The method according to claim 11 , further comprising switching said third address signal between said first address signal and said complement of said first address signal in response to a control signal generated based on the mode selected.
14. The method according to claim 11 , further comprising (i) switching said third address signal between said first address signal and said complement of said first address signal and (ii) switching said fourth address signal between said second address signal and a complement of said second address signal in response to one or more control signals generated based on the mode selected.
15. The method according to claim 14 , wherein a location of said fourth address signal and said second address signal within addresses presented to said first storage device and said second storage device is based upon a burst length.