GE IS200TTURH1BEC IS200TTURH1BED TURBINE TERMINATION MARK VI card

Description

GE General Electric Technical Specifications: IS200TTURH1BEC

IS200TTURH1BEC Scatter‐Gather DMA transfer is a mode usually used to perform large data

transfers separated into multiple smaller pages or blocks.  Note that a data page

must not cross a 4 GByte address boundary.  The DMA descriptor pointer is the

address for a chained list of page descriptors.

Each page descriptor defines the address and size of a data block plus a pointer to

the IS200TTURH1BEC next descriptor block. The descriptors are automatically fetched when needed

and then data is read/written to the corresponding page. The descriptor chain is

processed until the data transfer is finished or the end of the descriptor chain is

reached, whichever comes first.

IS200TTURH1BEC Page descriptor blocks cannot be mapped in 64‐bit addressing space.  The first

descriptor must be on a 16‐byte boundary.  For best performance, each descriptor

block should be aligned on a 16‐byte or 8‐byte boundary.

A descriptor chain must be created in PCI 32‐bit memory space before starting a

Scatter‐Gather DMA.  Each descriptor in the chain has this format:

1st Dword:  Lower 32‐bit PCI Address for Data (each page must be aligned

IS200TTURH1BEC on an 8‐byte boundary),

2nd Dword:  Upper 32‐bit PCI Address for Data ($0 for 32‐bit addressing),

3rd Dword:  Number of bytes to transfer to/from PCI Address (each page

size must be a multiple of 8 bytes),

4th Dword:  PCI Address of Next Descriptor (write $1 in this field to denote

end of chain)

Also, keep a total for the size of all data blocks pointed to by the chain.  This total

length value must be written to the DMA transfer size register.

1. Base Address Register 0 stores the starting address of the Local Control and

Configuration registers, which include the DMA Control registers. The value

in this register is PCIBAR0.

2. There are six DMA registers that must be configured to set up the DMA

cycle. These registers will remain unchanged after the DMA cycle.

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