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AC208-DS03-R 数据表(PDF) 31 Page - Broadcom Corporation.

部件名 AC208-DS03-R
功能描述  2.5V 10/100-TX 8-Port Repeater/71 Uplink Port with Integrated Bridge
PDF  58 Pages
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制造商  BOARDCOM [Broadcom Corporation.]
网页  http://www.broadcom.com
标志 BOARDCOM - Broadcom Corporation.

AC208-DS03-R 数据表(HTML) 31 Page - Broadcom Corporation.

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Preliminary Data Sheet
AC208
07/08/02
B roa dcom
Document
AC208-DS04-405-R
PHY Registers
Page 23
PHY REGISTERS
The following registers are defined for each PHY port. The base addresses of PHY 1 to PHY 8 are 0, 1, 2, 3, 4, 5, 6, and 7,
respectively.
PHY CONFIGURATION REGISTER
Table 19: PHY Configuration Register 0
Bit
Name
Definition
Mode
Default
0.15
Reset
1 = PHY reset
This bit is self-clearing.
RW/SC
0
0.14
Loopback
1 = Loopback mode. Because it internally loops the transmit of
AC208 to its receive, it ignores all the activity on the cable media.
0 = Normal operation.
RW
0
0.13
Speed Select
1 = 100 Mbps
0 = 10 Mbps. This bit is ignored if auto-negotiation is enabled.
It no longer reflects auto-negotiation results.
RW
1
0.12
Auto-Neg Enable
1 = Enable auto-negotiate process (overrides 0.13 and 0.8)
0 = Disable auto-negotiate process.
In force mode, speed is selected via bit 0.13.
RW
1
0.11
Power Down
1 = Power down mode, puts AC208 in low-power stand-by mode,
only reacts to access transaction.
0 = Normal operation.
RW
0
0.10
Isolate
1 = Electrical isolation of PHY from MII and cable media.
0 = Normal operation.
RW
0
0.9
Restart Auto-
Negotiation
1 = Restart auto-negotiation process.
0 = Normal operation.
RW/
SC
0
0.8
Duplex Mode
1 = Full-duplex.
0 = Half-duplex.
Full-duplex is not supported on this chip.
It no longer reflects auto-negotiation results.
RO
0
0.7
Collision Test
1 = Enable collision test, which issues the COL signal in
response to the assertion of TX_EN signal.
0 = Disable COL test.
RW
0
0.6:0
Reserved
RO
000000



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