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VPX-VLX85 / VPX-VLX110 / VPX-VLX155
USER’S MANUAL
DMA System Starting Address LSB Registers (Read/Write) - (BAR0 + 100H and 120H)
This register contains the least significant 32 address bits of the DMA System
Starting Address.
The DMA System Starting Address register meaning depends on the selected
DMA mode (see bit-3 of DMA command register). For Direct DMA Mode
this address register specifies the physical address of a contiguous memory
buffer where data will be read/written. For scatter-gather DMA mode this
address register points to the first element of the chained-listed of page
descriptors.
The DMA System Starting Address Register at BAR0 base address plus 100H
(120H) is used to set the DMA channel 0 (1) data starting address. Writing
to these registers is possible via 32-bit transfers.
DMA System Starting Address MSB Registers (Read/Write) - (BAR0 + 104H and 124H)
This register contains the most significant 32 address bits of the DMA
System Starting Address.
The DMA System Starting Address register meaning depends on the selected
DMA mode (see bit-3 of DMA command register). For Direct DMA Mode
this address register specifies the physical address of a contiguous memory
buffer where data will be read/written. For scatter-gather DMA mode this
address register points to the first element of the chained-listed of page
descriptors.
The DMA System Starting Address Register at BAR0 base address plus 104H
(124H) is used to set the DMA channel 0 (1) data starting address. Writing
to these registers is possible via 32-bit transfers.
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