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| 型號(hào)： | GT-48208 |
| 廠商： | Galileo Technology Services, LLC |
| 英文描述： | Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高級(jí)交換式 10+10/100 BaseX以太網(wǎng)控制器) |
| 中文描述： | 先進(jìn)的交換式以太網(wǎng)控制器的10 10/100 BaseX（高級(jí)交換式10 10/100 BaseX以太網(wǎng)控制器） |
| 文件頁(yè)數(shù)： | 77/135頁(yè) |
| 文件大?。?/td> | 1619K |
| 代理商： | GT-48208 |
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GT-482xx Switched Ethernet Controllers for 10+10/100 BaseX
GALI
LEO
TECHNOLOGY
CONFI
D
ENTI
AL
--
DO
NOT
REPRODUCE
46
Revision 1.2
IPG is programmable in the Serial Parameters register.
9.9
Partition Mode
A port enters Partition Mode when more than 32 consecutive collisions are seen on the port. When in Partition
Mode, the port continues to transmit but does not receive. The corresponding bit in the Status register is set when
a port is partitioned. A port is returned to normal operation mode when a good packet is seen on the wire.
9.9.1
Enabling Partition Mode
Partition is enabled (for all ports) by setting the enable bit in the GT-482xx Control Register. The default value is
Partition disabled for all ports. You must have a CPU in the system to enable partition mode; there is no pin strap-
ping option.
9.9.2
Entering Partition State
When Partition is enabled, a port will enter Partition state when either of the following two situations occur:
The port detects a collision on every one of 32 consecutive retransmit attempts of the same packet.
The port detects a single collision which occurs for more than 2048 bit times (i.e. most likely to occur in
AUI mode).
While in Partition state:
If the interrupt is not masked, the GT-482xx will issue an interrupt to the CPU upon entering Partition
state, and will set the partition bit of that port in the Status register.
The port will continue to transmit its pending packet, regardless of the collision detection, and will not fol-
low the usual Backoff Algorithm. A more aggressive Backoff Algorithm is in progress which is similar to
the Backoff Algorithm when Limit4 is activated. Additional packets pending for transmission are transmit-
ted, while ignoring the internal collision indication. This frees the port's transmit buffers which would oth-
erwise be filled up at the expense of the other ports' buffers. The assumption is that Partition is a system
failure situation (bad connector/cable/station), thus losing the transmitted packets is a small price to pay
versus the cost of halting the switch by filling up all of its buffers.
The Partition Indication is available via the LED interface (both the status led - blinking twice, and a dedi-
cated led - on constantly).
9.9.3
Exiting from Partition State
The port will exit from Partition state at the end of a successful packet transmission. A successful packet transmis-
sion will be declared, provided no collisions were detected on the first 512 bits of the transmission. If the interrupt
is not masked, the GT-482xx issues an interrupt to the CPU upon exiting from Partition state, and clears the parti-
tion bit of that port in the Status register.
9.10
802.1q VLAN Tagging Support
The GT-482xx has the ability to receive and transmit Ethernet frames up to 1536 bytes in length, thereby accom-
modating the IEEE 802.1q standard VLAN tagging bytes (four extra bytes or more.) This feature is enabled/dis-
abled by bit 13 in the Port Control register. The default is to disable this feature. Bytes longer than 1536 are
discarded as over-size frames.
9.11
Back Pressure
Back-pressure support in the 10Mbps ports is identical to the support for the 100Mbps ports, described previously.
9.12
Flow Control
Flow control support in the 10Mbps ports is identical to the support for the 100Mbps ports, described previously.
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