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5220-DS02-R 数据表(PDF) 62 Page - Broadcom Corporation.

部件名 5220-DS02-R
功能描述  10/100BASE-TX/FX Mini Transceiver
PDF  90 Pages
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制造商  BOARDCOM [Broadcom Corporation.]
网页  http://www.broadcom.com
标志 BOARDCOM - Broadcom Corporation.

5220-DS02-R 数据表(HTML) 62 Page - Broadcom Corporation.

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BCM5220
Preliminary Data Sheet
04/20/04
Broa d c om Co rp o r a t i o n
Page 50
Auxiliary Mode Register
Document
5220-DS04-405-R
When bit 2 of the Auxiliary Control register is 0, the speed of the chip is 10BASE-T. In all other cases, either the speed is
not forced (auto-negotiation is enabled), or the speed is forced to 100BASE-X.
Speed Indication
This read-only bit shows the true current operation speed of the BCM5220. A 1 bit indicates 100BASE-X operation, while a
0 indicates 10BASE-T. While the auto-negotiation exchange is performed, the BCM5220 is always operating at 10BASE-T
speed.
Full-Duplex Indication
This read-only bit returns a 1 when the BCM5220 is in full-duplex mode. In all other modes, it returns a 0.
AUXILIARY MODE REGISTER
Table 28 shows the bit descriptions for the Auxiliary Mode register.
Activity LED Disable
When set to 1, disables the XMTLED# and RCVLED# output pins. When 0, XMTLED# and RCVLED# output pins are
enabled.
Link LED Disable
When set to 1, disables the Link LED output pin. When 0, Link LED output is enabled.
Table 28: Auxiliary Mode Register (Address 29d, 1Dh)
Bit
Name
R/W
Description
Default
15:13
Reserveda
RO
Ignore when read
12
Alternative Link LED Mode
R/W
1 = LNKLED# indicates link at 100Base-TX,
SPDLED# indicates link at 10BASE-T.
0 = Normal operation for LNKLED# and SPDLED#.
0
11:5
Reserveda
RO
Ignore when read
0
4
Activity LED Disable
R/W
1 = Disable XMT/RCV activity LED outputs
0 = Enable XMT/RCV activity LED outputs
0
3
Link LED Disable
R/W
1 = Disable link LED output
0 = Enable link LED output
0
2
Reserveda
RO
Ignore when read
1
Block TXEN Mode
R/W
1 = Enable block TXEN mode
0 = Disable block TXEN mode
0
0
Reserveda
a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”
RO
Ignore when read
0



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