Page Content

1 Library
2 Block
3 Mask
4 Description
5 Parameters
6 Inputs
7 Outputs
8 Characteristics and Limitations

Library

rtlab/Communication/SharedMemory

Block

The OpSharedMemoryRead block allows a user to read a shared memory in memory or on a physical address.

OpSharedMemoryRead block

Mask

OpSharedMemoryRead mask.

Description

The OpSharedMemoryRead is used in a Master, or Slave subsystem along with the OpSharedMemoryCtrl block, to allow communication with shared memory.

Parameters

Controller ID: Specifies the controller ID of the OpSharedMemoryCtrl that the Read block will use.

Offset: Specifies the starting memory offset in global Shared Memory space for this block.

Memory access size: Specifies the size of each read access to the memory. Each size corresponds to a certain amount of data read for each memory access:

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

Inputs

This block has no inputs.

Outputs

Data: Data in the shared memory will be output using the address specified in the controller + the offset. 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 long word format:

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

Characteristics and Limitations

Direct Feedthrough	N/A
Discrete sample time	Yes
XHP support	Yes
Work offline	No