參數(shù)資料
型號(hào)： GT-48001A
廠(chǎng)商： Galileo Technology Services, LLC
英文描述： Switched Ethernet Controller For 10BaseX(10BaseX交換式快速以太網(wǎng)控制器)
中文描述： 交換式以太網(wǎng)控制器10BaseX（10BaseX交換式快速以太網(wǎng)控制器）
文件頁(yè)數(shù)： 45/101頁(yè)
文件大?。?/td> 1235K
代理商： GT-48001A
GT-48001A Switched Ethernet Controller
48
Revision 1.6
12.10 Back-pressure
Back-pressure is not supported by the GT-48001A. Back-pressure can greatly deteriorate real network throughput in
favor of better standardized test scores. Back-pressure works is by "jamming" an entire network segment when the
switch cannot accept new transmissions. This blocks
all traffic, including traffic between nodes on the same network
segment (like blocking local phone calls when the long distance circuits are busy.) Simply dropping packets is a better
solution for overall network throughput, although this is not reflected in some simplistic standardized tests. (Dropped
packets are detected by higher-layer protocols and regenerated.)
12.11 VLAN Tagging Support
The GT-48001A will receive and transmit Ethernet frames up to 1522 bytes in length, thereby accommodating the stan-
dard VLAN tagging bytes (four extra bytes.) Bytes longer than 1522 are discarded as over-size frames. VLAN Tagging
Support is disabled by default.
12.12 Serial Modes
Each Ethernet port can operate in one of four seral modes: 10BaseT, 10BaseFL, AUI, or Synchronous. The serial
mode is set after RESET by the state of the TxDDel/TxD pins for each port. These values can be overridden in the Port
Control Register.
12.12.1 Signal Polarity in Specific Serial Modes
The polarity (active HIGH or LOW) of the TxEn (output), RxEn (input/output) and Coll (input) signals depend on the
serial mode for which the GT-48001A is configured (see Table 25.)
12.12.2 10BaseT Mode
Table 25: Signal Polarity by Serial Mode
Se ri a l M o de
Si gnal
10B aseT
I/O
10B ase F
I/O
AUI
I/O
TxEN
HIGH
O
HIGH
O
HIGH
O
CrS
HIGH
O
HIGH
O
HIGH
O
RxLP/Coll
Link Pulse
I
Connect ‘1’
I
Coll-10 MHz
I
Table 26: 10BaseT Ethernet Interface Pin Descriptions
Pi n Na m e
I/ O
1 0 Ba seT
Mo de
Fu n c t i on a l it y
SClk
I
80 MHz
80 MHz Clock.
RxD
I
RxD
Receive Data: Manchester encoded data.
RxLP
I
RxD_LP
Link Pulses - This pin carries the link pulses.
CrS
O
CrS
Carrier Sense: Indicates presence on received packet. (pre-
amble to SOI)
Pol
O
Pol
Indicates the Polarity. 1 - Positive polarity; 0 - Negative polar-
ity. When auto-polarity is enabled, the Pol output reflects the
polarity of the SOI symbol at the end of a valid incoming
packet. Auto-polarity is enabled by default for the GT-48001A.
Auto-polarity is disabled by default for the GT-48001.
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