Initiating read and write transactions, Initiating read and write transactions –20 – Altera RapidIO II MegaCore Function User Manual
Page 62
4–20
Chapter 4: Functional Description
Logical Layer Interfaces
RapidIO II MegaCore Function
August 2014
Altera Corporation
User Guide
Input/Output Avalon-MM Slave Signals
lists the Input/Output Avalon-MM Slave module interface signals.
The I/O Avalon-MM Slave module supports an interrupt line, io_s_mnt_irq, on the
Register Access interface. When enabled, the following interrupts assert the
io_s_mnt_irq
signal:
The interface supports an interrupt line, io_s_mnt_irq. When enabled, the following
interrupts assert the io_s_mnt_irq signal:
■
Read out of bounds
■
Write out of bounds
■
Invalid write
■
Invalid read or write burstcount
■
Invalid read or write byteenable value
For more information about the I/O Logical layer Avalon-MM slave module
interrupts, refer to
.
Initiating Read and Write Transactions
To initiate a read or write transaction on the RapidIO link, your system sends a read or
write request to the I/O Logical layer Slave module Avalon-MM interface.
Table 4–9. Input/Output Avalon-MM Slave Interface Signals
Signal
Direction
Description
ios_rd_wr_waitrequest
Output
I/O Logical Layer Avalon-MM Slave module wait request.
ios_rd_wr_write
Input
I/O Logical Layer Avalon-MM Slave module write request.
ios_rd_wr_read
Input
I/O Logical Layer Avalon-MM Slave module read request.
ios_rd_wr_address[N:0]
for N == 9, 10,..., or 31
Input
I/O Logical Layer Avalon-MM Slave module address bus. The address
is a quad-word address (addresses a 16-byte (128-bit) quad-word),
not a byte address.
“Defining the Input/Output Avalon-MM Slave Address Mapping
for information about the RapidIO II IP core
process to determine the values for the corresponding RapidIO packet
header fields. You determine the width of the ios_rd_wr_address
bus in the RapidIO II parameter editor.
ios_rd_wr_writedata[127:0]
Input
I/O Logical Layer Avalon-MM Slave module write data bus.
ios_rd_wr_byteenable[15:0]
Input
I/O Logical Layer Avalon-MM Slave module byte enable.
ios_rd_wr_burstcount[4:0]
Input
I/O Logical Layer Avalon-MM Slave module burst count.
ios_rd_wr_readresponse
Output
I/O Logical Layer Avalon-MM Slave module read error response. I/O
Logical Layer Avalon-MM Slave module read error. Indicates that the
burst read transfer did not complete successfully.
ios_rd_wr_readdata[127:0]
Output
I/O Logical Layer Avalon-MM Slave module read data bus.
ios_rd_wr_readdatavalid
Output
I/O Logical Layer Avalon-MM Slave module read data valid.