Cypress S6J3200 Series, Руководство пользователя

Страница: 1199 / 1355

CHAPTER 33:Graphics Subsystem
1198 S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
3.1.8.
Video RAM
−
All configuration parameters of the Video RAM Interface are available via SubSysCtrl
registers.
3.1.9.
HyperBus
TM
access via interleaving AXI bridge
To use the second HyperBus TM interface or to use both HyperBus TM interfaces with interleaved access
the AxiBridge needs to be set up. The AxiBridge configuration registers are a part of the SubSysCtrl
module.
 Use both HyperBus
TM
interfaces parallel
Before starting any AXI transfers to the external memory range, do the following:
−
Setup registers StartMaster0Region so that there is some space available for HyperBus TM
interface 1
−
Setup registers StartMaster1Region to use some that available space for HyperBus TM
interface 1
−
Setup register field remap to 1 to select HyperBus for the external memory range
Do not change any of the above settings when the external memory range might be accessed.
 Use both HyperBus
TM
interfaces interleaved
Before starting any AXI transfers to the external memory range, do the following:
−
Setup registers StartMaster0Region and StartMaster1Region so that some of the regions
are the same
−
Setup registers InterleavingStepSize according to the interleaving step size you would like
to use
−
Setup register field remap to 1 to select HyperBus for the external memory range
Do not change any of the above settings when the external memory range might be accessed.
For optimal performance, set the InterleavingStepSize to 64 Byte.