Wiznet W7500 Reference Manual page 249

Reset value: 0x----
31 30 29 28
res res res res
15 14 13 12
R/W R/W R/W R/W
Higher eight bits masked access
[15:8] Data for higher byte access, with bits[9:2] of address value used as enable bit mask
for each bit
[7:0] Not used
W7500 Datasheet Version1.0.0
27 26 25
res res res
11 10 9
HBM
R/W R/W R/W
24 23 22 21
res res res res
8 7 6
res res res
R/W R/W R/W R/W
20 19 18
res res res
5 4 3 2
res res res
R/W R/W R/W
249 / 512
17 16
res res
1 0
res res
R/W R/W