ICS1894-33
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE PHYCEIVER
IDT®
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE 26
ICS1894-33 REV A 021612
Note 1: Ignored if Auto negotiation is enabled.
Note 2: CW = Command Override Write
LH = Latching High
LL = Latching Low
LMX = Latching Maximum
RO = Read Only
RW = Read/Write
RW/0 = Read/Write Zero
RW/1 = Read/Write One
SC = Self-clearing
SF = Special Functions
Note 3: L = Latched on power-up/hardware reset
‡ Whenever the PHY address is equal to 00000 (binary), the Isolate bit 0.10 is logic one, whenever the PHY address Is not equal to 00000, the
Isolate bit 0.10 is logic zero.
† As per the IEEE Std 802.3u, during any write operation to any bit in this register, the STA must write the default value to all Reserved bits.
Register 25 - Extended Control Register
25.15:12 Reserved Reserved RW 0 0
25.11 Reserved Reserved RW 0 6
25.10 Reserved Reserved RW 1
25.9 TX10BIAS_SET The normal output current of the Bias block for
10BaseT is 540uA. Changing the register can modify
the current with a step size of 5%
000: output 80% current
001: output 85% current
010: output 90% current
011: output 95% current
100: output 100% current
101: output 105% current
110: output 110% current
111: output 115% current
RW 1
25.8 0
25.7 04
25.6 TX100BIAS_SET The normal output current of the Bias block for
100BaseTX is 180uA. Changing the register can
modify the current with a step size of 5%
000: output 80% current
001: output 85% current
010: output 90% current
011: output 95% current
100: output 100% current
101: output 105% current
110: output 110% current
111: output 115% current
RW 1
25.5 0
25.4 0
25.3 OUTDLY_CTL This register controls the delay time of the digital
control signal for xmit_dac.
00: Longest delay time (same as original design)
01: Long delay time
10: Short delay time
11: Shortest delay time
RW 0 1
25.2
25.1 Reserved Reserved RW 0
25.0 1
Register
26 - 31 - Extended Control Register (Reserved)
Bit Definition When Bit = 0 When Bit = 1 Access
2
SF
2
Default
3
Hex
