SOURce:DIGital:MEMory:STEP
Syntax
SOURce:DIGital:MEMory:STEP (@<ch_list>)
Description
This command handshakes one sample onto the data lines on the 34950A Digital I/O Module and then places buffered memory in the "stopped" state. If memory is currently disabled (see SOURce:DIGital:MEMory:ENABle command), this command will output the first sample and then stop. The width of the first channel in each bank (i.e., channels 101 and 201) controls the width of the memory operations (64K x 8 Bits, 64K x 16 Bits, or 32K x 32 Bits). The first channel on the specified bank must be configured as an output prior to starting a buffered write (see SOURce:DIGital:DATA[:<width>] command) and a trace must be downloaded to memory and assigned to the specified bank (see SOURce:DIGital:MEMory:TRACe command).
Used With:
34950A Digital I/O Module
Parameters
|
Name |
Type |
Range of Values |
Default Value |
|
<ch_list> |
Numeric |
The first channel on a bank in the form (@sccc).
|
This is a required parameter |
Remarks
Depending on the width specified (see SOURce:DIGital:DATA[:<width>] command), the channel numbering is modified as shown below. For example, if you specify the width as a 16-bit WORD, channels 101 and 102 are combined and addressed collectively as channel 101.
|
|
Bank 2 |
Bank 1 |
||||||
|
BYTE (8 Bits): |
Ch 204 |
Ch 203 |
Ch 202 |
Ch 201 |
Ch 104 |
Ch 103 |
Ch 102 |
Ch 101 |
|
WORD (16 Bits): |
Ch 203 |
Ch 201 |
Ch 103 |
Ch 101 |
||||
|
LWORd (32 Bits): |
Ch 201 |
Ch 101 |
||||||
This command overrides the hardware INTR (interrupt) line (see SOURce:DIGital:INTerrupt[:ENABle] command); therefore, you can use the SOURce:DIGital:MEMory:STEP command to step a buffered write even if the bank is configured to start on an interrupt.
If you send this command while a buffered write is already running, it will stop memory and step once. To resume a stopped buffered write, send the SOURce:DIGital:MEMory:STARt command.
Example
The following program segment configures a buffered write on channel 101 on the module in slot 3 and then writes one sample from memory.
SOUR:DIG:DATA:WORD
#HFFFF,(@3101) !Set
initial output pattern
SOUR:DIG:MEM:NCYC 3,(@3101) !Output
complete trace 3 times
TRAC:DIG:FUNC (@3101),WONES,PATTERN_1,32 !Download
"walking ones" pattern
SOUR:DIG:MEM:TRAC PATTERN_1,(@3101) !Assign
trace to channel 101
SOUR:DIG:MEM:ENAB ON,(@3101) !Enable
memory on channel 101
SOUR:DIG:MEM:STEP (@3101) !Write
one sample from memory
See Also
SOURce:DIGital:INTerrupt[:ENABle]
SOURce:DIGital:MEMory:ABORt
SOURce:DIGital:MEMory:NCYCles
SOURce:DIGital:MEMory:TRACe