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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)： | 71/135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
40
Revision 1.2
Figure 5: MMII Receive Signal Timing
8.9
10/100 Mbps Full-duplex Operation
When operating in full-duplex mode the GT-482xx can transmit and receive frames simultaneously. In full-duplex
mode, the CrS signal is associated with received frames only and has no effect on transmitted frames. The Col
signal is ignored by the GT-482xx while in full-duplex mode. Transmission starts when TxEn goes active. Trans-
mission starts regardless of the state of CrS. Reception starts when the CrS and RxDV signals are asserted indi-
cating traffic on the receive port of the PHY.
8.10
Illegal Frames
The GT-482xx discards all illegal frames and increments the appropriate error MIB counters. For example, runts
(less than 64 bytes), oversize (greater than 1518/1536 bytes), and bad FCS (bad checksum).
8.11
Partition Mode
A port enters Partition Mode when more than 32 consecutive collisions are seen on a 10Mbps port, or more than
60 consecutive collisions are seen on a 100Mbps port. In Partition Mode the port continues to transmit but it will
not receive. The corresponding bit in the Status register is set when a port is partitioned. A port is returned to nor-
mal operation mode when a good packet is seen on the wire.
8.11.1 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.
8.11.2 Entering Partition State
When Partition is enabled, a port enters Partition state for any of the following cases:
The port detects a collision on every one of 32 consecutive retransmit attempts of the same packet on a
10Mbps port
The port detects a collision on every one of 60 consecutive retransmit attempts of the same packet on a
100Mbps port
The port detects a single collision which occurs for more than 512 bit times.
While in Partition state:
If the interrupt is not masked, the GT-482xx issues an interrupt to the CPU upon entering Partition state,
and sets the partition bit of that port in the Status register.
10ns
MIN
RxClk
RxD, RxDV,
RxEr
10ns
MIN
Vih
min
Vil
max
Vih
min
Vil
max
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