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35 Wed May 28 17:37:25 1997
Draft 1/21/97
L64007 MPEG-2, DVB, JSAT Transport Demultiplexer Technical Manual
4-35
PRE.4 for Rev. D
Copyright 1997 by LSI Logic Corporation. All rights reserved.
RES
Reserved
[15:14], 1
These bits are reserved.
TR_MSB
Transfer Pointer MSB
[13:10]
This 4-bit eld is the 4 MSBs of the transfer pointer for
DRAM to DMA FIFO transfer mode (TR_SEL = 0). These
four bits, together with the 16 bits in the DPLR, form a
20-bit address register where the transfer operation will
start. After reset, this eld’s value is 0000.
TR_BLOCK
Transfer Block Size
[9:4]
This 6-bit parameter determines the transfer block size
through the DMA FIFO. All transfers, whether with the
host processor or the DMA controller, must be done on
the specied TR_BLOCK size.
After reset, the TR_BLOCK eld value is 100000.
TR_SEL
Transfer Select
3
When set to 1, this bit selects the PPU to be attached to
the DMA FIFO. In this mode, TR_DIR must be 0. When
reset to 0, it selects the DRAM to be connected to the
DMA FIFO. After reset, the bit is 0.
TR_DIR
Transfer Operation Direction
2
This bit determines the data transfer direction between
external host system and the internal DMA FIFO. When
set to 1, the DMA FIFO is in the write mode, and the
external host processor or DMA controller writes blocks
of data (in the size specied by the TR_BLOCK parame-
ter) to the DMA FIFO. When reset to 0, the DMA FIFO is
in read mode, and the external host processor or DMA
controller reads blocks of data (in the size specied by
the TR_BLOCK) from the DMA FIFO. After reset, the bit
is 0.
Bit Settings
Transfer Block Size (Words)
000000
Reserved. Do not set these bits to zero.
000001
1
000010
2
000011
3
.
1xxxxx
32