VDMA实用配置说明
VDMA是通过AXI Stream协议对视频数据在PS与PL端进行搬运,开发者无需关注AXI Stream协议,在BlockDesign设计中只需要把相应信号进行连接即可。
VDMA配置有两个选项
1、 Basic:
选择地址位宽32bit 或者64bit;
FrameBuffer 1~32可选,通常选择3帧缓存;可避免图像割裂;
2、 Adanced:
写通道配置:
maxi_S2MM 是将stream流数据通过axi总线写进memory。
Fsync Options帧同步有三个选项none、s2mm fsync、s2mm tuser;
none被选择后AXI VDMA处于free run模式,VDMA会尽可能快速的搬运数据,不受外部触发信号所控制;
s2mm fsync被选择VDMA检测到s2mm fsync下降沿信号后开始搬运数据;
s2mm tuser被选择VDMA检测视频帧起始信号(SOF)即AXI4-Stream下的s2mm tuser信号,检测到信号拉高后开始搬运视频数据;
GenLockMode有四个选项Master、Slave、DynamicMaster、DynamicSlave;
Master:VDMA在s2mm_frame_ptr_out端口输出当前帧号;
Slave:When selected, Slave follows the Master by the frames set in the Frame Delay registereither by skipping or repeating frames. The GenlockEn (S2MM_VDMACR[3]=1) registershould be set to enable genlock synchronization between the Master and Slave. Itoutputs the current frame number on the mm2s_frame_ptr_out port.;
DynamicMaster:When selected, AXI VDMA skips the frame buffers that the Dynamic Slave is working on.
It outputs the completed frame number on the s2mm_frame_ptr_out port. GenlockEn
(S2MM_VDMACR[3]=1) register should be set to enable genlock
synchronization between Dynamic Master and Dynamic Slave.
DynamicSlave:When selected, AXI VDMA follows the Dynamic Master either by skipping or repeating frames. It outputs the current frame number on the s2mm_frame_ptr_out port. GenlockEn (S2MM_VDMACR[3]=1) register should be set to enable gunlock synchronization between Dynamic Master and Dynamic Slave.
读通道配置:
maxi_mm2s通道是将视频数据通过axi总线从memory读出;
maxis_mm2s 是将视频数据转成axis stream数据流形式;
Fsync Options帧同步有两个选项none、mm2s fsync;
none被选择后AXI VDMA处于free run模式,VDMA会尽可能快速的搬运数据,不受外部触发信号所控制;
注意在选择none后通道会提供一个帧起始脉冲m_axis_mm2s_tuser(0)可用于下一级模块downstream;
mm2s fsync被选择VDMA检测到mm2s fsync下降沿信号后开始搬运数据;
GenLockMode有四个选项Master、Slave、DynamicMaster、DynamicSlave;
Master:VDMA在mm2s_frame_ptr_out端口输出当前帧号;
Slave:When selected, Slave follows the Master by the frames set in the Frame Delay registereither by skipping or repeating frames. The GenlockEn (MM2S_VDMACR[3]=1 registershould be set to enable genlock synchronization between the Master and Slave. Itoutputs the current frame number on the s2mm_frame_ptr_out.;
DynamicMaster:When
selected, AXI VDMA skips the frame buffers that the Dynamic Slave is working
on.
It outputs the completed frame number on the mm2s_frame_ptr_out. GenlockEn
(MM2S_VDMACR[3]=1) register should be set to enable gunlock synchronization
between Dynamic Master and Dynamic Slave.
DynamicSlave:When selected, AXI VDMA follows the Dynamic Master either by skipping or repeating frames. It outputs the current frame number on the mm2s_frame_ptr_out . GenlockEn (MM2S_VDMACR[3]=1) register should be set to enable gunlock synchronization between Dynamic Master and Dynamic Slave.
VDMA工作简单时序理解
VDMA内部linebuffer通过HP接口从DDR中搬运数据,通常VDMA之后直接连接axis_stream to video out IP模块,该IP模块内部通过异步FIFO来缓存数据实现跨时钟域的问题,整体时序描述为VDMA 出tready信号给到PS,VDMA会预读一部分数据到linebuffer中,检测到video_out模块给出的tready信号将数据给到video_out 模块的fifo中,如果fifo存满则video_out不再给VDMA tready信号,此时VDMA仍旧一直从DDR中读数据,直到video_out模块中的FIFO变空再次给出tready信号,数据才会从VDMA中linebuffer流向video_out模块;
VDMA 同步机制理解
Master和Slave同步机制相当于古代的夫妻,讲究的是夫唱妇随,master是老公,slave是老婆,master不去理会slave当前在操作哪帧数据,自己只顾干自己的事情;slave则需要跟随master,因此slave需要实时监测master的ptr帧指针。
Dynamic master/Dynamic slave同步机制则像现代社会的夫妻制度,讲究的是谦让和谐,master还是老公,slave还是老婆,但是两者在工作时会通过ptr指针互相监督彼此。假如master看到slave在操作某一帧即1时,而此时自己也想对1进行操作,他会考虑这样不行会起冲突,进而转向对2进行操作。同理slave也是一样;设计者在BlockDesign中需要将ptr_in和ptr_out用线连接起来;
VDMA 在设计中通常配置如下
VDMA读、写通道通常配置3帧缓存,这样能避免图像显示有割裂现象。
VDMA写通道通常配置s2mm tuser,dynamic master,至于位宽什么根据自己设计而定;
VDMA读通道通常配置none ,dynamic slave;
VDMA SDK驱动
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VDMA是通过AXI Stream协议对视频数据在PS与PL端进行搬运,开发者无需关注AXI Stream协议,在BlockDesign设计中只需要把相应信号进行连接即可。
VDMA配置有两个选项
1、 Basic:
选择地址位宽32bit 或者64bit;
FrameBuffer 1~32可选,通常选择3帧缓存;可避免图像割裂;
2、 Adanced:
写通道配置:
maxi_S2MM 是将stream流数据通过axi总线写进memory。
Fsync Options帧同步有三个选项none、s2mm fsync、s2mm tuser;
none被选择后AXI VDMA处于free run模式,VDMA会尽可能快速的搬运数据,不受外部触发信号所控制;
s2mm fsync被选择VDMA检测到s2mm fsync下降沿信号后开始搬运数据;
s2mm tuser被选择VDMA检测视频帧起始信号(SOF)即AXI4-Stream下的s2mm tuser信号,检测到信号拉高后开始搬运视频数据;
GenLockMode有四个选项Master、Slave、DynamicMaster、DynamicSlave;
Master:VDMA在s2mm_frame_ptr_out端口输出当前帧号;
Slave:When selected, Slave follows the Master by the frames set in the Frame Delay registereither by skipping or repeating frames. The GenlockEn (S2MM_VDMACR[3]=1) registershould be set to enable genlock synchronization between the Master and Slave. Itoutputs the current frame number on the mm2s_frame_ptr_out port.;
DynamicMaster:When
selected, AXI VDMA skips the frame buffers that the Dynamic Slave is working
on.
It outputs the completed frame number on the s2mm_frame_ptr_out port. GenlockEn
(S2MM_VDMACR[3]=1) register should be set to enable genlock
synchronization between Dynamic Master and Dynamic Slave.
DynamicSlave:When selected, AXI VDMA follows the Dynamic Master either by skipping or repeating frames. It outputs the current frame number on the s2mm_frame_ptr_out port. GenlockEn (S2MM_VDMACR[3]=1) register should be set to enable gunlock synchronization between Dynamic Master and Dynamic Slave.
读通道配置:
maxi_mm2s通道是将视频数据通过axi总线从memory读出;
maxis_mm2s 是将视频数据转成axis stream数据流形式;
Fsync Options帧同步有两个选项none、mm2s fsync;
none被选择后AXI VDMA处于free run模式,VDMA会尽可能快速的搬运数据,不受外部触发信号所控制;
注意在选择none后通道会提供一个帧起始脉冲m_axis_mm2s_tuser(0)可用于下一级模块downstream;
mm2s fsync被选择VDMA检测到mm2s fsync下降沿信号后开始搬运数据;
GenLockMode有四个选项Master、Slave、DynamicMaster、DynamicSlave;
Master:VDMA在mm2s_frame_ptr_out端口输出当前帧号;
Slave:When selected, Slave follows the Master by the frames set in the Frame Delay registereither by skipping or repeating frames. The GenlockEn (MM2S_VDMACR[3]=1 registershould be set to enable genlock synchronization between the Master and Slave. Itoutputs the current frame number on the s2mm_frame_ptr_out.;
DynamicMaster:When
selected, AXI VDMA skips the frame buffers that the Dynamic Slave is working
on.
It outputs the completed frame number on the mm2s_frame_ptr_out. GenlockEn
(MM2S_VDMACR[3]=1) register should be set to enable gunlock synchronization
between Dynamic Master and Dynamic Slave.
DynamicSlave:When selected, AXI VDMA follows the Dynamic Master either by skipping or repeating frames. It outputs the current frame number on the mm2s_frame_ptr_out . GenlockEn (MM2S_VDMACR[3]=1) register should be set to enable gunlock synchronization between Dynamic Master and Dynamic Slave.
VDMA工作简单时序理解
VDMA内部linebuffer通过HP接口从DDR中搬运数据,通常VDMA之后直接连接axis_stream to video out IP模块,该IP模块内部通过异步FIFO来缓存数据实现跨时钟域的问题,整体时序描述为VDMA 出tready信号给到PS,VDMA会预读一部分数据到linebuffer中,检测到video_out模块给出的tready信号将数据给到video_out 模块的fifo中,如果fifo存满则video_out不再给VDMA tready信号,此时VDMA仍旧一直从DDR中读数据,直到video_out模块中的FIFO变空再次给出tready信号,数据才会从VDMA中linebuffer流向video_out模块;
VDMA 同步机制理解
Master和Slave同步机制相当于古代的夫妻,讲究的是夫唱妇随,master是老公,slave是老婆,master不去理会slave当前在操作哪帧数据,自己只顾干自己的事情;slave则需要跟随master,因此slave需要实时监测master的ptr帧指针。
Dynamic master/Dynamic slave同步机制则像现代社会的夫妻制度,讲究的是谦让和谐,master还是老公,slave还是老婆,但是两者在工作时会通过ptr指针互相监督彼此。假如master看到slave在操作某一帧即1时,而此时自己也想对1进行操作,他会考虑这样不行会起冲突,进而转向对2进行操作。同理slave也是一样;设计者在BlockDesign中需要将ptr_in和ptr_out用线连接起来;
VDMA 在设计中通常配置如下
VDMA读、写通道通常配置3帧缓存,这样能避免图像显示有割裂现象。
VDMA写通道通常配置s2mm tuser,dynamic master,至于位宽什么根据自己设计而定;
VDMA读通道通常配置none ,dynamic slave;
VDMA SDK驱动
未附上