LAN9218I_07 Datasheet, PDF (87/133 Pages) SMSC Corporation – High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support

High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support
Datasheet
5.3.16 GPT_CNT-General Purpose Timer Current Count Register
Offset:
90h
Size:
This register reflects the current value of the GP Timer.
32 bits
BITS
DESCRIPTION
31-16 Reserved
15-0 General Purpose Timer Current Count (GPT_CNT). This 16-bit field
reflects the current value of the GP Timer.
TYPE
RO
RO
DEFAULT
-
FFFFh
5.3.17 WORD_SWAP—Word Swap Control
Offset:
98h
Size:
32 bits
This register controls how words from the host data bus are mapped to the CSRs and Data FIFOs
inside the LAN9218i. The LAN9218i always sends data from the Transmit Data FIFO to the network
so that the low order word is sent first, and always receives data from the network to the Receive Data
FIFO so that the low order word is received first.
BITS
31:0
DESCRIPTION
Word Swap. This field only has significance if the device is operated in 16-
bit mode. In 32-bit mode, D[31:15] is always mapped to the high order word
and D[15:0] is always mapped to the low order word. In 16-bit mode, if this
field is set to 00000000h, or anything except 0xFFFFFFFFh, the LAN9218i
maps words with address bit A[1]=1 to the high order words of the CSRs
and Data FIFOs, and words with address bit A[1]=0 to the low order words
of the CSRs and Data FIFOs. If this field is set to 0xFFFFFFFFh, the
LAN9218i maps words with address bit A[1]=1 to the low order words of the
CSRs and Data FIFOs, and words with address bit A[1]=0 to the high order
words of the CSRs and Data FIFOs.
Note: Please refer to Section 3.6.1, "32-bit vs. 16-bit Host Bus Width
Operation" for additional information.
TYPE
R/W
NASR
DEFAULT
00000000h
SMSC LAN9218i
87
DATASHEET
Revision 1.8 (06-06-07)