ip178a ETC-unknow, ip178a Datasheet - Page 26

• Manufacturer Part Number: ip178a
• Description: 8-port 10/100 Ethernet Integrated Switch
• Manufacturer: ETC-unknow

LED Interface
IP178A provides four kinds of LED information and two
kinds of LED interfaces. The LED information is selected
by LED_O_SEL[1:0] pins and the LED interface is
selected by DIRECT_LED pin.
When IP178A works at direct mode (DIRECT_LED pin
pulled high), it drives 24 LED pins directly to provide link,
speed and fdx LED. The operation of link, speed and fdx
LED are defined by LED_O_SEL[1:0] pins.
When IP178A works at scan mode (DIRECT_LED pin
pulled low), it drives 12 LED control pins with scan
Preliminary, Specification subject to change without notice
IP178A-DS-P05
Sep. 09, 2002
Label
PHASE0
PHASE1
PHASE2
PHASE3
LINK_A
RX_A
FDX_A
SPEED_A
LINK_B
RX_B
FDX_B
SPEED_B
PHASE0
PHASE1
PHASE2
PHASE3
LINK_a
LINK_b
(SPEED_a, FDX_a)
(SPEED_b, FDX_b)
State_1
Port0 link
Port0 rx
Port0 fdx
Port0 speed
Port4 link
Port4 rx
Port4 fdx
Port4 speed
p0
p4
State_1
State_2
1
0
0
0
p1
p5
State_3
p2
p6
Port1 link
Port1 rx
Port1 fdx
Port1 speed
Port5 link
Port5 rx
Port5 fdx
Port5 speed
State_4
p3
p7
State_2
26
0
1
0
0
State_1
p0
p4
mythology to provide link, speed, fdx and rx LED. The
operation of link, speed, fdx and rx LED are defined by
LED_O_SEL[1:0] pins.
When IP178A works at scan mode, phase pins run
periodically to generate state_1 to state_4. Link_a sends
out the link status of port0 at state_1 and Link_b sends
out the link status of port4 at state_1. IP178A supports rx,
fdx and speed LED in the same way. The detail
description and waveforms are shown in the following
diagram.
State_2
p1
p5
Port2 link
Port2 rx
Port2 fdx
Port2 speed
Port6 link
Port6 rx
Port6 fdx
Port6 speed
State_3
State_3
p2
p6
0
0
1
0
State_4
p3
p7
State_1
Port3 link
Port3 rx
Port3 fdx
Port3 speed
Port7 link
Port7 rx
Port7 fdx
Port7 speed
...
...
(Advance Version)
State_4
0
0
0
1
IP178A