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Hardware Reference Manual 181
Intel
®
IXP2800 Network Processor
Microengines
4.5.1 Microengine Endianness
Microengine operation from an “endian” point of view can be divided into following categories:
• Read from RBUF (64 bits)
• Write to TBUF (64 bits)
• Read/write from/to SRAM
• Read/write from/to DRAM
• Read/write from/to SHaC and other CSRs
• Write to Hash
4.5.1.1 Read from RBUF (64 Bits)
Data in RBUF is arranged in LWBE order. Whenever the Microengine reads from RBUF, the low
order longword (LDW0) is transferred into Microengine transfer register 0 (treg0), the high order
longword (LDW1) is transferred into treg1, etc. This is explained in Figure 60.
Figure 60. Read from RBUF (64 Bits)
A8941-01
0123
4567
8 9 10 11
12 13 14 15
4567
12 13 14 15
0123
MicroEngine
LDW1 LDW0
RBUF
treg0
treg1
treg2
treg3
8 9 10 11