402-00005-00
Registers
3–74
Rev 02; February 8, 2002
3.5.5.2 Interrupt Address LSB Mask (LSBMASK) R/W
The four LSBMASK bits enable masking the lower order bits in the Acquire Interrupt Address. Masking changes the
resolution of the acquire line interrupt. Only the settings shown below are valid. A higher order bit can only be
masked off if all lower bits are also masked off.
LSBMASK
Function
0x0
No mask; 256 byte resolution
0x1
Mask off INTADR0; 512 byte resolution
0x3
Mask off INTARD1 and INTADR0; 1024 byte resolution
0x7
Mask off INTADR(2–0); 2048 byte resolution
0xFF
Mask off INTADR(3–0); 4096 byte resolution
3.5.6 Segment Size (SGSZ) R/W
0
7
0x20
SGSZ7
SGSZ6
SGSZ5
SGSZ4
SGSZ3
SGSZ2
SGSZ1
SGSZ0
8
15
Reserved
SGSZ14
SGSZ13
SGSZ12
SGSZ11
SGSZ10
SGSZ9
SGSZ8
PCP_SGSZ_32
16
23
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
24
31
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
This register defines the number of valid destination entries (descriptor pairs) defined in the DMA Table. The DMA
Table can hold up to 32K descriptors. A bus master transfer always begins at the start location defined by the DMA
Start Address in the BMCTLX register.
SGSZ
Function
0
Process 1 DMA Table entry during transfer
1
Process 2 DMA Table entries during transfer
. . .
. . .
0x7FF
Process 32K DMA Table entries during transfer
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