DM9081FP DAVICOM [Davicom Semiconductor, Inc.], DM9081FP Datasheet - Page 11
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DM9081FP
Manufacturer Part Number
DM9081FP
Description
10BASE-T Hub Controller
Manufacturer
DAVICOM [Davicom Semiconductor, Inc.]
Datasheet
1.DM9081FP.pdf
(22 pages)
AUI Ports Status
The AUI_LED pin transmits the status of DM9081's
two AUI ports on the falling edge of TCK. Figure 5
shows a typical external hardware setup employed to
convert a serial bit stream into parallel form. The
accuracy of the AUI signals is within 8 Bit Times (BT).
The contents of the output data for the AUI_LED are
as followed:
Bit 0: AUI port 1 partition status (0: if partition)
Bit 1: AUI port 1 bit rate error status (0: if bit rate
Bit 2: AUI port 1 jabber status (0: if jabber)
Bit 3: AUI port 1 loopback status (0: if loopback error)
Bit 4: AUI port 2 partition status (0: if partition)
Bit 5: AUI port 2 bit rate error status (0: if bit rate
Bit 6: AUI port 2 jabber status (0: if jabber)
Bit 7: AUI port 2 loopback status (0: if loopback error)
TP Ports Bit Rate Error Status
The TP_BIT_LED pin sends out global bit rate error
information of the DM9081's Hub.
TP Ports Jabber Status
The TP_JAB_LED pin sends out global jabber
information of the DM9081's Hub.
TP Ports Partition Status
The TP_PAR_LED pin transmits partition information
for the DM9081's eight TP ports on the falling edge of
TCK. Figure 4 shows a typical external hardware
configuration employed to convert the serial bit
stream into parallel form. The accuracy of the
partition signals is 8 bit. If a TP port is in partition
status, its corresponding bit is set to low. The
contents of the output data for the TP_PAR_LED are
as followed:
Bit 0: TP port 0 partition status
Bit 1: TP port 1 partition status
Bit 2: TP port 2 partition status
Bit 3: TP port 3 partition status
Bit 4: TP port 4 partition status
Bit 5: TP port 5 partition status
Bit 6: TP port 6 partition status
Bit 7: TP port 7 partition status
Final
Version: DM9081-DS-F02
February 02, 2001
error)
error)
Traffic Status
The TRAFFIC_LED pin transmits a utilization report
for the 10MHz bandwidth on the falling edge of TCK.
Figure 4 shows a typical external hardware
configuration employed to convert the serial bit
stream into parallel form. The accuracy of the traffic
signals is 8 bit. The corresponding bit is set to low, if
the following conditions are met. The contents of the
output data for the TRAFFIC_LED are as followed:
Bit 0: Over 1% utilization of 10MHz bandwidth
Bit 1: Over 6.25% utilization of 10MHz bandwidth
Bit 2: Over 12.5% utilization of 10MHz bandwidth
Bit 3: Over 25% utilization of 10MHz bandwidth
Bit 4: Over 37.5% utilization of 10MHz bandwidth
Bit 5: Over 50% utilization of 10MHz bandwidth
Bit 6: Over 62.5% utilization of 10MHz bandwidth
Bit 7: Over 87.5% utilization of 10MHz bandwidth
As shown above, if all 8 bits are active low, the
utilization is in excess of 87.5% for the 10MHz
bandwidth.
TP Ports Link Status
The TP_LINK_LED transmits link information for the
DM9081's eight TP ports on the falling edge of TCK.
Figure 5 shows a typical external hardware
configuration employed to convert the serial bit
stream into parallel form. The accuracy of the link
signals is within 8 bit. If a TP port is line fail, its
corresponding bit is set to high. If a TP port is line
pass, its corresponding bit is set to low. When this
port receives a packet, its corresponding bit is set
high for 78ms, then driven low at least 52ms until it
responds to the next packet. The contents of the
output data for the TP_LINK_LED are as followed:
Bit 0: TP port 0 link/receive status
Bit 1: TP port 1 link/receive status
Bit 2: TP port 2 link/receive status
Bit 3: TP port 3 link/receive status
Bit 4: TP port 4 link/receive status
Bit 5: TP port 5 link/receive status
Bit 6: TP port 6 link/receive status
Bit 7: TP port 7 link/receive status
10BASE-T Hub Controller
DM9081
11