| Start Address
|
Stop Address
|
Register Description
|
Additional Info
|
| $AF:0400 |
$AF:0400 |
VDMA_CONTROL_REG |
VDMA control register
| Bit
|
Name
|
Purpose
|
| $01 |
VDMA_CTRL_Enable |
Enabled the VDMA transfer block
|
| $02 |
VDMA_CTRL_1D_2D |
0 - 1D (Linear) Transfer, 1 - 2D (Block) Transfer
|
| $04 |
VDMA_CTRL_TRF_Fill |
0 - Transfer Src -> Dst, 1 - Fill Destination with "Byte2Write"
|
| $08 |
VDMA_CTRL_Int_Enable |
Set to 1 to Enable the Generation of Interrupt when the Transfer is over.
|
| $10 |
VDMA_CTRL_SysRAM_Src |
Set to 1 to Indicate that the Source is the System Ram Memory
|
| $20 |
VDMA_CTRL_SysRAM_Dst |
Set to 1 to Indicate that the Destination is the System Ram Memory
|
| $80 |
VDMA_CTRL_Start_TRF |
Set to 1 To Begin Process, Need to Cleared before, you can start another
|
|
| $AF:0401 |
$AF:0401 |
VDMA_STATUS_REG / VDMA_BYTE_2_WRITE |
On write, accepts the byte to use in the fill function.
On read, this register shows the status of the VDMA:
| Bit
|
Name
|
Purpose
|
| $01 |
VDMA_STAT_Size_Err |
If Set to 1, Overall Size is Invalid
|
| $02 |
VDMA_STAT_Dst_Add_Err |
If Set to 1, Destination Address Invalid
|
| $04 |
VDMA_STAT_Src_Add_Err |
If Set to 1, Source Address Invalid
|
| $80 |
VDMA_STAT_VDMA_IPS |
If Set to 1, VDMA Transfer in Progress (this Inhibit CPU Access to Mem)
|
|
| $AF:0402 |
$AF:0402 |
VDMA_SRC_ADDY_L |
24-bit address of the source block (relative to start of video RAM)
|
| $AF:0403 |
$AF:0403 |
VDMA_SRC_ADDY_M
|
| $AF:0404 |
$AF:0404 |
VDMA_SRC_ADDY_H
|
| $AF:0405 |
$AF:0405 |
VDMA_DST_ADDY_L |
24-bit address of the source block (relative to start of video RAM)
|
| $AF:0406 |
$AF:0406 |
VDMA_DST_ADDY_M
|
| $AF:0407 |
$AF:0407 |
VDMA_DST_ADDY_H
|
| $AF:0408 |
$AF:0408 |
VDMA_SIZE_L / VDMA_X_SIZE_L |
For 1-D DMA, 24-bit size of transfer in bytes. For 2-D, 16-bit width of block
|
| $AF:0409 |
$AF:0409 |
VDMA_SIZE_M / VDMA_X_SIZE_H
|
| $AF:040A |
$AF:040A |
VDMA_SIZE_H / VDMA_Y_SIZE_L |
For 2-D transfer, 16-bit height of block
|
| $AF:040B |
$AF:040B |
VDMA_RESERVED_0 / VDMA_Y_SIZE_H
|
| $AF:040C |
$AF:040C |
VDMA_SRC_STRIDE_L |
Number of bytes per row in a 2-D source block
|
| $AF:040D |
$AF:040D |
VDMA_SRC_STRIDE_H
|
| $AF:040E |
$AF:040E |
VDMA_DST_STRIDE_L |
Number of bytes per row in a 2-D destination block
|
| $AF:040F |
$AF:040F |
VDMA_DST_STRIDE_H
|
