Altera RapidIO MegaCore Function - Manual (Page 138)

6–6 Chapter 6: Software Interface
Physical Layer Registers
RapidIO MegaCore Function August 2014 Altera Corporation
User Guide
Table 6–7. PRTCTRL—Port Response Time-Out Control CSR—0x124
Field Bits Access Function Default
VALUE [31:8] RW
Time-out internal value.
■ Physical layer-only variations: This value is not used by the RapidIO IP
core. The contents of this register drive the port_response_timeout
output signal.
■ Variations using Logical layers: The duration of the port response
time-out for all transactions that require a response—including
MAINTENANCE
, DOORBELL, NWRITE_R, and NREAD transactions—is
approximately equal to 4.5 seconds multiplied by the contents of this
field, divided by (2
24 - 1).
Note: Avoid time-out values less than 0x000010 because they may not
be reliable.
Note: A new value in this field might not propagate quickly enough to be
applied to the next transaction. Any packet sent within 64 Avalon clock
cycles of the value change in the register might be sent using the
previous time-out value.
Note: Avoid changing the value in this field when any packet is waiting to
be transmitted or waiting for a response, to ensure that in each FIFO, the
pending entries all have the same time-out value.
24'hFF_FFFF
RSRV [7:0] UR0 Reserved 8'h0
Table 6–8. Port General Control—Offset: 0x13C
Field Bits Access Function Default
HOST [31] RW
A host device is a device that is responsible for system exploration,
initialization, and maintenance. Host devices typically initialize agent or
slave devices.
'b0 - agent or slave device
'b1 - host device
1'b0
ENA [30] RW
The Master Enable bit controls whether or not a device is allowed to
issue requests to the system. If Master Enable is not set, the device
may only respond to requests.
'b0 - The processing element cannot issue requests
'b1 - The processing element can issue requests
Variations that use only the Physical layer ignore this bit.
1'b0
DISCOVER [29] RW
This device has been located by the processing element responsible
for system configuration.
'b0 - The device has not been previously discovered
'b1 - The device has been discovered by another processing
element
1'b0
RSRV [28:0] RO Reserved 29'b0