EZ-USB FX3 Technical Reference Manual, Document Number: 001-76074 Rev. *F 367
PP_DMA_XFER
0xE0017E2C
10.8.8 PP_DMA_XFER
P-Port DMA Transfer Register
This register is used to set up and control a DMA transfer.
15 DMA_READY Indicates that the link controller is ready to exchange data.
0 Socket not ready for transfer
1 Socket ready for transfer; SIZE_VALID is also guaranteed 1
14 DMA_ERROR 0 No errors
1 DMA transfer error
This bit is set when a DMA error occurs and cleared when the next transfer is started using
DMA_ENABLE = 1.
13 DMA_BUSY Indicates that link controller is busy processing a transfer. A zero length transfer would cause
DMA_READY to never assert.
0 No DMA is in progress
1 DMA is busy
12 SIZE_VALID Indicates that DMA_SIZE value is valid and corresponds to the socket selected in PP_DMA_XFER.
SIZE_VALID will be 0 for a short period after PP_DMA_XFER is written into. AP will poll SIZE_VALID
or DMA_READY before reading DMA_SIZE.
10 LONG_TRANSFER 0 Short transfer (DMA_ENABLE clears at end of buffer
1 Long Transfer (DMA_ENABLE must be cleared by AP at end of transfer)
9DMA_DIRECTION 0 Read (Transfer from FX3 – Egress direction)
1 Write (Transfer to FX3 – Ingress direction)
8 DMA_ENABLE 0 Disable ongoing transfer. If no transfer is ongoing ignore disable
1 Enable data transfer
7:0 DMA_SOCK[7:0] Processor specified socket number for data transfer
PP_DMA_XFER P-Port DMA Transfer Register 0xE0017E2C
b15 b14 b13 b12 b11 b10 b9 b8
DMA_READY DMA_ERROR DMA_BUSY SIZE_VALID LONG_TRANSFER DMA_DIRECTION DMA_ENABLE
RRRR R/W R/W R/W
WWWR/W
RRR/W
0000
000
PP_DMA_XFER P-Port DMA Transfer Register
b7 b6 b5 b4 b3 b2 b1 b0
DMA_SOCK[7:0]
R/W R/W R/W R/W R/W R/W R/W R/W
RRRRRRRR
00000000
Bit Name Description
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