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ADM5120
Function Description
Chapter 3 Function Description
3.1 System
3.1.1 Frequency
The system clock frequency of ADM5120 is programmable as follows
00: 175MHz (Default)
01: 200MHz
1x: Reserved
The number is set by the pull up or pull down of A[4:3].
This clock is for the MIPS, major switch cores, and SDRAM access.
3.1.2 Boot code data-width
The data width of flash or ROM is set by A[19:17] pull up or down
A[19:17]
→
1xx: Big-Endian (default 0: little endian)
x00: boot in 8-bit (default)
x01: boot in 16-bit
x10: boot in 32-bit
11: Reserved
3.1.3 GMII/MII port
The GMII/MII port can be programmed for the following: AN monitor on/off, force
speed/duplex/flow-control, which can be set by Switch Control Register (B+14).
The GMII/MII direction is also programmable for the following: connect to PHY or AC,
which can be set by Switch Control Register (B+30).
The default GMII/MII mode is ‘connect to PHY’. The signals direction will change, and
suggest the connection as below
(5120 PHY) RXC
→
RXC (MAC side)
TXC
→
TXC
TXD
→
RXD
TXE
→
RXDV
RXD
←
TXD
RXDV
←
TXE
COL
→
COL
CRS
→
CRS
ADMtek Inc.
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