ICS1893 Datasheet, PDF (63/152 Pages) Integrated Circuit Systems – 3.3-V 10Base-T/100Base-TX Integrated PHYceiver™

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Chapter 8 Management Register Set
8.2 Register 0: Control Register
Table 8-5 lists the bits for the Control Register, a 16-bit register used to establish the basic operating
modes of the ICS1893.
• The Control Register is accessible through the MII Management Interface.
• Its operation is independent of the MAC/Repeater Interface configuration.
• It is fully compliant with the ISO/IEC Control Register definition.
Note: For an explanation of acronyms used in Table 8-5, see Chapter 1, “Abbreviations and Acronyms”.
Table 8-5. Control Register (Register 0 [0x00]
Bit
Definition
When Bit = 0
When Bit = 1
0.15 Reset
No effect
ICS1893 enters Reset
mode
0.14 Loopback enable
Disable Loopback mode Enable Loopback mode
0.13 Data rate select
10 Mbps operation
100 Mbps operation
0.12 Auto-Negotiation enable Disable Auto-Negotiation Enable Auto-Negotiation
0.11 Low-power mode
Normal power mode
Low-power mode
0.10 Isolate
No effect
Isolate ICS1893 from MII
0.9 Auto-Negotiation restart No effect
Restart Auto-Negotiation
0.8 Duplex mode
Half-duplex operation Full-duplex operation
0.7 Collision test
No effect
Enable collision test
0.6 IEEE reserved
Always 0
N/A
0.5 IEEE reserved
Always 0
N/A
0.4 IEEE reserved
Always 0
N/A
0.3 IEEE reserved
Always 0
N/A
0.2 IEEE reserved
Always 0
N/A
0.1 IEEE reserved
Always 0
N/A
0.0 IEEE reserved
Always 0
N/A
Ac- SF De- Hex
cess
fault
R/W SC 0
3
R/W –
0
R/W –
1
R/W –
1
R/W –
0 0/4†
R/W – 0/1†
R/W SC 0
R/W –
0
R/W –
0
0
RO – 0‡
RO – 0‡
RO – 0‡
RO – 0‡ 0
RO – 0‡
RO – 0‡
RO – 0‡
† Whenever the PHY address of Table 8-16:
• Is equal to 00000 (binary), the Isolate bit 0.10 is logic one.
• 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.
8.2.1 Reset (bit 0.15)
This bit controls the software reset function. Setting this bit to logic one initiates an ICS1893 software reset
during which all Management Registers are set to their default values and all internal state machines are
set to their idle state. For a detailed description of the software reset process, see Section 5.1.2.3,
“Software Reset”.
During reset, the ICS1893 leaves bit 0.15 set to logic one and isolates all STA management register
accesses. However, the reset process is not complete until bit 0.15 (a Self-Clearing bit), is set to logic zero,
which indicates the reset process is terminated.
ICS1893 Rev C 6/6/00
Copyright © 2000, Integrated Circuit Systems, Inc.
All rights reserved.
63
June, 2000