lan9221 Standard Microsystems Corp., lan9221 Datasheet - Page 36

• Manufacturer Part Number: lan9221
• Description: High-performance 16-bit Non-pci 10/100 Ethernet Controller With Variable Voltage I/o
• Manufacturer: Standard Microsystems Corp.

High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
R X/TX D ata FIFO Port
R X/TX D ata FIFO D irect
C SR s and Status FIFO s
A ccess (addresses 00h to
A ccess
3C h)
(FIFO _SEL = 1)
FIFO Port Endian O rdering
D irect FIFO A ccess Endian
FSELEN D
FPO R TEN D
(H W _C FG [28])
(H W _C FG [29])
Logic
O rdering Logic
"W O R D SW A P"
W O R D _SW A P
Logic
D [15:0]
(H ost D ata B us)
Figure 3.2 LAN9221/LAN9221i Host Data Path Diagram
Data path operations for the various supported endianess and word swap configurations are illustrated
in
Figure
3.3.
Table 3.8, "Endian Ordering Logic Operation"
illustrates the byte ordering applied by the
endian logic for each type of host access. This figure and table assume an internal byte ordering of 3-
2-1-0, where ‘3’ is the most significant byte (data[31:24]) and ‘0’ is the least significant byte (data[7:0]).
36
Revision 2.6 (12-04-08)
SMSC LAN9221/LAN9221i
DATASHEET