Block

Mask

Description

The OpScramnet Write block is used in a Master or Slave subsystem along with the OpScramnet Ctrl block, to read the reflective memory buffer of a Curtiss-Wright SCRAMNet+ device. At each calculation step, it reads the reflective memory locations starting at the address specified by the sum of the Base Address parameter and the Offset input. The size of a memory unit is determined by the Memory access size parameter and each of these units is placed on the Data output. The width of that output determines the number of units to be read.

Parameters

Controller and Node ID	Specifies the controller ID of the OpScramnet Ctrl that the Read block will use.
Base Address	Specifies the starting address, in bytes, in the reflective memory at which reading is to be started. When the optional Offset input is used, the reading start address is the sum of the offset and the base address.
Memory access size	Specifies the type (and size) of each memory access. The values returned on the Data output will be converted from the specified format.

The following formats are supported:

byte	8 bits unsigned integer data
word	16 bits unsigned integer data
long word	32 bits unsigned integer data
float	single precision, 32 bits float data
double	double precision, 64 bits float data

Note: The type of the Data output is always doubles.

Use external offset	Allows the user to specify an offset added to the Base Address. An offset input will be added to the block when selected. If this option is not selected, memory is always read starting at the base address. The address and the offset are always expressed in bytes.
Sample time	The sample period in second. Use 0 for continuous and -1 for inherited. This is the sample time parameter commonly encountered in the simulink block library.

Inputs

Offset	This input is available if the Use external offset checkbox is checked.

Outputs

Data: Data in the shared memory will be reported using the address specified in the base address and the offset if applicable. Use a demux to specify the number of outputs to be used. For example, for a demux with a width of 3, the starting address is at 0xd4000, and the memory access size in word format with an offset of 0x00:

Demux output	Offset
1	0x00
2	0x02
3	0x04

Memory access size is in longword format:

Demux output	Offset
1	0x00
2	0x04
3	0x08

Characteristics and Limitations

This block has no special characteristics.

Direct Feedthrough	No
Discrete sample time	Yes
XHP support	No
Work offline	No

RT-LAB Documentation

OpScramnet Read Block