ACD82224 Datasheet, PDF (39/77 Pages) List of Unclassifed Manufacturers – 24 Ports 10/100 Fast Ethernet Switch

ACD80800 and the ACD80900, which need to snoop the data bus for certain activities. Table-
7.31 describes all the bits of this register.
Table-7.31: CLKADJ Register
Bit
Description
3:0
ARL Clock Timing Adjustment:
(16 levels within a 10 ns clock cycle, each delay unit adds
approximately 0.5-0.7 ns, “inversion” adds 5 ns or one half of clock
cycle to the delay)
0001 – no delay
0011 – 1 units delay
0000 – inversion plus no delay
0010 – inversion plus 1 units delay
0101 – 2 units delay
0100 – inversion plus 2 units delay
0111 – 3 units delay
0110 – inversion plus 3 units delay
1001 – 4 units delay
1000 – inversion plus 4 units delay
1011 – 5 units delay
1010 – inversion plus 5 units delay
1101 – 6 units delay
1100 – inversion plus 6 units delay
1111 – 7 units delay
1110 – inversion plus 7 units delay
5:4
Write Data Window Width Adjustment
(Approximately 0.7 ns per increment)
00 – Default 2.5 ns wide
01 – 1 units increment
10 – 2 units increment
11 – 3 units increment
7:6
Write Data Window Location Adjustment
(Approximately 1.25ns per increment)
00 – no delay
01 – 1 unit delay
10 – 2 units delay
11 – 3 units delay
Default
0011
00
00
Shared Pin
P23TXD3
P23TXD2
P23TXD1
P23TXD0
(From Bit3
to Bit0)
P06TXEN
P05TXEN
P09TXEN
P08TXEN
PHYREG register (register 32-63)
The PHYREG refers to the registers residing on the PHY devices. The ACD82224 provides a
mirror access path for the control of CPU to access the registers on the PHYs. For detailed
information about the PHY registers, please refer to the PHY data sheet. The register index is
used by the ACD82224 to specify the PHY's internal registers.
For example, register-36 with index-0 would refer to the control register (register-0) in the device
of PHY's ID is 4.
Table-7.24: PHY Registers
PHYREG 32~63
Index
Register 32
0~31
Register 33
0~31
Register 34
0~31
Register 35
0~31
..
..
..
..
Register 63
0~31
Description
PHY Management registers with PHY's ID is 0
PHY Management registers with PHY's ID is 1
PHY Management registers with PHY's ID is 2
PHY Management registers with PHY's ID is 3
..
..
PHY Management registers with PHY's ID is 31
Default
PHY
Default
Value
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