Endian Control (Byte and Word Swapping)BCM5718 Programmer’s Guide
Broadcom®
January 29, 2016 • 5718-PG108-R Page 199
Word Swap Data = 1, and Byte Swap Data = 1
So, for a little-endian (e.g., x86) host, software should set both the Word Swap Data, and Byte Swap Data bits.
This is because a little endian host will expect the first byte on the wire (byte D1) to be placed into memory at
the least significant (starting) address of the packet data.
D5 D6 S1 S2
S3 S4 S5 S6
T1 T2 IP1 IP2
Table 66: 64-Bit PCI Bus (WSD = 1, BSD = 1)
B7 B6 B5 B4 B3 B2 B1 B0
63–56 55–48 47–40 39–32 31–24 23–16 15–8 7–0
S2 S1 D6 D5 D4 D3 D2 D1
IP2 IP1 T2 T1 S6 S5 S4 S3
Table 67: 32-Bit PCI Bus (WSD = 1, BSD = 1)
B3 B2 B1 B0
31–24 23–16 15–8 7–0
D4 D3 D2 D1
S2 S1 D6 D5
S6 S5 S4 S3
IP2 IP1 T2 T1
Table 65: 32-Bit PCI Bus (WSD = 1, BSD = 0) (Cont.)
B3 B2 B1 B0
31–24 23–16 15–8 7–0
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