ICS1894-40
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE
PHYCEIVER
Bit
18.3
Definition
When Bit = 0
When Bit = 1
Access 2 SF2
Default3
Hex
Auto polarity inhibit
Polarity automatically
corrected
Polarity not automatically
corrected
RW
RW
RW
RW
–
–
–
–
0
0
0
0
0
18.2
18.1
18.0
SQE test inhibit
Link Loss inhibit
Squelch inhibit
Normal SQE test
behavior
SQE test disabled
Normal Link Loss
behavior
Link Always = Link Pass
Normal squelch behavior No squelch
Register 19h - Extended Control Register
19.15
19.14
Node Mode
Node mode
Repeater mode
RW
RW
–
–
L
L
–
2
Hardware/Software
Mode Speed Select
Use bit00.13 to select
speed
Use real time input pin 22
only to select speed
19.13
19.12
19.11
Remote Fault
No faults detected
Remote fault detected
RO
RW
RW
–
–
–
0
0
0
Register Bank select
[01]=Bank1, access register0x00~0x13 and registers
0x14~0x1F
[00]=Bank0, access register0x00~0x13, new defined
registers 0x14~0x25
[1x]=Bank0, same as [00]
19.10
19.9
19.8
19.7
IDT reserved
AMDIX_EN
MDI_MODE
Read unspecified
Read unspecified
RO
RW
RW
RW
–
–
–
–
0
1
0
0
See Table on page 11
See Table on page 11
See Table on page 11
See Table on page 11
Twisted Pair Tri-State
Enable, TPTRI
Twisted Pair Signals are Twisted Pair Signals are
not Tri-Stated or No
effect
0
1
Tri-Stated
19.6
19.5
19.4
19.3
19.2
19.1
19.0
ICS reserved
ICS reserved
ICS reserved
ICS reserved
ICS reserved
ICS reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
RW
RW
RW
RW
RW
RW
RW
–
–
–
–
–
–
–
0
0
0
0
0
0
1
Reserved
Reserved
Reserved
Reserved
Reserved
Automatic 100Base-TX
Power Down
Do not automatically
power down
Power down automatically
Register 20h - Extended Control Register
20.15
Str_enhance
Normal digital output
strength
Enhance digital output
strength in 1.8V condition
RW
0
3
20.14
20.13
20.12
Fast-off
LED4 mode
Disable the function
Enable fast-off circuit
RW
RW
–
–
0
1
1
00=Receive data
01=Collision
10=Fullduplex
11=OFF (default LED4)
IDT® 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE
24
ICS1894-40
REV G 060110
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
