Altera RapidIO II MegaCore Function - Manual (Page 192)

6–54 Chapter 6: Software Interface
Transport and Logical Layer Registers
RapidIO II MegaCore Function August 2014 Altera Corporation
User Guide
Table 6–85. Rx Doorbell Status—Offset: 0x04
Field Bits Access Function Default
RSRV [31:8] RO Reserved 24’b0
FIFO_LEVEL [7:0] RO
Shows the number of available DOORBELL messages in the Rx FIFO.
A maximum of 16 received messages is supported.
8'h0
Table 6–86. Tx Doorbell Control—Offset: 0x08
Field Bits Access Function Default
RSRV [31:2] RO Reserved 30'h0
PRIORITY [1:0] RW
Request Packet’s priority. 2’b11 is not a valid value for the
priority
field. An attempt to write 2’b11 to this field will be
overwritten as 2’b10.
2'h0
Table 6–87. Tx Doorbell—Offset: 0x0C
Field Bits Access Function Default
LARGE_DESTINATION_ID
(MSB)
[31:24]
RO Reserved if the system does not support 16-bit device ID.
8'h0
RW
MSB of the targeted RapidIO processing element device ID if
the system supports 16-bit device ID.
DESTINATION_ID [23:16] RW Device ID of the targeted RapidIO processing element 8'h0
INFORMATION (MSB) [15:8] RW MSB information field of the outbound DOORBELL message 8'h0
INFORMATION (LSB) [7:0] RW LSB information field of the outbound DOORBELL message 8'h0
Table 6–88. Tx Doorbell Status—Offset: 0x10
Field Bits Access Function Default
RSRV [31:24] RO Reserved 8'h0
PENDING [23:16] RO
Number of DOORBELL messages that have been transmitted, but
for which a response has not been received. There can be a
maximum of 16 pending DOORBELL messages.
8'h0
TX_FIFO_LEVEL [15:8] RO
The number of DOORBELL messages in the staging FIFO plus the
number of DOORBELL messages in the Tx FIFO. The maximum
value is 16.
8'h0
TXCPL_FIFO_LEVEL [7:0] RO
The number of available completed Tx DOORBELL messages in
the Tx Completion FIFO. The FIFO can store a maximum of 16.
8'h0
Table 6–89. Tx Doorbell Completion—Offset: 0x14 (1) (Part 1 of 2)
Field Bits Access Function Default
LARGE_DESTINATION_ID [31:24] RO
Reserved if the system does not support 16-bit device ID.
8'h0 MSB of the targeted RapidIO processing element device ID if
the system supports 16-bit device ID.
DESTINATION_ID [23:16] RO The device ID of the targeted RapidIO processing element. 8'h0
INFORMATION [15:8] RO
MSB of the information field of an outbound DOORBELL
message that has been confirmed as successful or
unsuccessful.
8'h0