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E1437A User's Guide
VXI plug&play Programming Reference
The following table summarizes the available block sizes for each setting of the
dType and resolution parameters.
=====================================================================
data
port
=====================================================================
vme
vme
vme
vme
lbus
lbus
lbus
lbus
_____________________________________________________________________
* For optional additional memory, multiply by the appropriate
memory size multiplier. For example, for 32 MByte memory option
multiply max block size by 4.
NOTE
Block size does not need to be a power of two. Considerably more samples may
need to be taken in order to set the block available status bit.
blocksizePtr contains the current value of the blocksize parameter. The returned value
will be closest valid value to the requested blocksize.
appendStatus selects whether or not status information is appended to a data block.
Specifying HPE1437_ON means that an extra byte of status information is appended to
the end of each data block to indicate whether an ADC overload or error occurred
during the collection of that block of data. In this status byte, Bit 0 will be set if an ADC
overload occurred and bit 1 will be set for an ADC error. The other bits are undefined.
When the appended byte is transferred via the VME backplane, the byte is located in the
lower 8 bits of the 16 bit word after the end of the sampled data block. The upper 8 bits
are undefined. When the appended byte is output via the local bus (as a 32-bit word), it
is marked as the last byte of a transfer block. This status byte should be read separately
from any block read operations in order to not affect the alignment of subsequent
elements. HPE1437_OFF disables this feature.
appendStatusPtr contains the current value of the status parameter.
4-22
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data
resolution
bytes per
type
Sample
real
16
real
32
complex
16
complex
32
real
16
real
32
complex
16
complex
32
min block
size
2
3
4
2
4
2
8
1
2
6
4
3
4
3
8
2
max block size
(with standard
8 MByte memory)*
4,194,304
2,097,152
2,097,152
1,048,576
4,194,304
2,097,152
2,097,152
1,048,576
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