Altera RapidIO II MegaCore Function - Manual (Page 174)

6–36 Chapter 6: Software Interface
Transport and Logical Layer Registers
RapidIO II MegaCore Function August 2014 Altera Corporation
User Guide
Transmit Port-Write Registers
Table 6–45 through Table 6–47 describe the transmit port-write registers.
Refer to “Handling Port-Write Transactions” on page 4–36 for information about
using these registers to transmit a port-write.
Table 6–43. Tx Maintenance Mapping Window n Offset—Offset: 0x10108, 0x10118
Field Bits Access Function Default
RSRV [31:24] RO Reserved 8'h0
OFFSET [23:0] RW Window offset 24'h0
Table 6–44. Tx Maintenance Mapping Window n Control—Offset: 0x1010C, 0x1011C
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 Destination ID if the system supports 16-bit
device ID.
DESTINATION_ID [23:16] RW Destination ID 8'h0
HOP_COUNT [15:8] RW Hop count 8'hFF
PRIORITY [7:6] RW
Packet priority.
2’b11 is not a valid value for the PRIORITY field. Any attempt
to write 2’b11 to this field is overwritten with 2’b10.
2'b00
RSRV [5:0] RO Reserved 6'h0
Table 6–45. Tx Port Write Control—Offset: 0x10200
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 Destination ID if the system supports 16-bit
device ID.
DESTINATION_ID [23:16] RW Destination ID 8'h0
RSRV [15:8] RO Reserved 8'h00
PRIORITY [7:6] 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 is overwritten as 2’b10.
2'b00
SIZE [5:2] RW
Packet payload size in number of double words. If set to 0,
the payload size is single word. If size is set to a value
larger than 8, the payload size is 8 double words (64 bytes).
4'h0
RSRV [1] RO Reserved 1'b0
PACKET_READY [0] RW
Write 1 to start transmitting the port-write request. This bit
is cleared internally after the packet has been transferred to
the Transport layer to be forwarded to the Physical layer for
transmission.
1'b0