Altera RapidIO II MegaCore Function - Manual (Page 69)

Chapter 4: Functional Description 4–27
Logical Layer Interfaces
August 2014 Altera Corporation RapidIO II MegaCore Function
User Guide
Translation Window 2
An Avalon-MM address in which the two most significant bits have a value of 2'b11
matches window 2. The RapidIO transaction corresponding to the Avalon-MM
operation has a destination ID value of 0xCC. This value corresponds to processing
endpoint 2.
Figure 4–13 shows address translation window 2.
Avalon-MM Burstcount and Byteenable Encoding in RapidIO Packets
The RapidIO II IP core converts Avalon-MM transactions to RapidIO packets. The IP
translates the Avalon-MM burst count, byteenable, and address bit 3 values to the
RapidIO packet read size, write size, and word pointer fields.
For information about the packet size encoding that the RapidIO II IP core
implements for read requests, refer to
Table 4–10 and Table 4–11 . For information
about the packet size encoding that the RapidIO II IP core implements for write
requests, refer to
Table 4–10 and Table 4–12 .
Table 4–10 lists the allowed Avalon-MM ios_rd_wr_byteenable values if
ios_rd_wr_burstcount has the value of 1, and the corresponding encoding in the
packet header fields of a RapidIO read or write request packet.
Figure 4–13. Translation Window 2
26’h3555999
26’h3555999 RapidIO Address [33:0]
Avalon Address [31:0]
1
0 0 0
Destination ID
Don’t Care
Don’t Care
0 2 3
3
000000000000000000..............00
Base (register 0x10420)
Mask (register 0x10424)
Offset (register 0x10428)
Control (register 0x1042C)
1 29
29
23 16
30 31
R
R 1 1
1
1
1
1 0
0
0
0 1
1
1 1
30 31 32 33
XAMO
0xCC
Table 4–10. I/O Logical Layer Slave Read or Write Request Size Encoding I (Part 1 of 2)
Avalon-MM Signal Values (1) RapidIO Header Field Values
burstcount
(5'dx,
128-bit units)
byteenable
(16'bxxxx_xxxx_xxxx_xxxx)
wdptr
(1'bx)
rdsize or
wrsize
(4'bxxxx)
address[0]
(rio_addr[3])
1 0000_0000_0000_0001 1 0011 0
1 0000_0000_0000_0010 1 0010 0
1 0000_0000_0000_0100 1 0001 0
1 0000_0000_0000_1000 1 0000 0