Altera RapidIO MegaCore Function - Manual (Page 160)

6–28 Chapter 6: Software Interface
Transport and Logical Layer Registers
RapidIO MegaCore Function August 2014 Altera Corporation
User Guide
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 6–61. Tx Doorbell—Offset: 0x0C (Part 2 of 2)
Field Bits Access Function Default
Table 6–62. 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 6–63. Tx Doorbell Completion—Offset: 0x14 (1)
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
INFORMATION [7:0] RO
LSB of the information field of an outbound DOORBELL
message that has been confirmed as successful or
unsuccessful.
8'h0
Note to Table 6–63 :
(1) The completed Tx DOORBELL message comes directly from the Tx Doorbell Completion FIFO.
Table 6–64. Tx Doorbell Completion Status—Offset: 0x18
Field Bits Access Function Default
RSRV [31:2] RO Reserved 30'h0
ERROR_CODE [1:0] RO
This error code corresponds to the most recently read message from
the Tx Doorbell Completion register. After software reads the Tx
Doorbell
Completion register, a read to this register should follow
to determine the status of the message.
2'b00—Response DONE status
2'b01—Response with ERROR status
2'b10—Time-out error
2'h0