参数资料
型号: ICS1893BFLFT
厂商: IDT, Integrated Device Technology Inc
文件页数: 81/133页
文件大小: 0K
描述: PHYCEIVER LOW PWR 3.3V 48-SSOP
标准包装: 1
系列: PHYceiver™
类型: PHY 收发器
规程: MII
电源电压: 3.14 V ~ 3.47 V
安装类型: 表面贴装
封装/外壳: 48-BSSOP(0.295",7.50mm 宽)
供应商设备封装: 48-SSOP
包装: 标准包装
产品目录页面: 1252 (CN2011-ZH PDF)
其它名称: 800-1017-6
Chapter 7 Management Register Set
ICS1893BF, Rev. F, 5/13/10
May, 2010
51
ICS1893BF Data Sheet Rev. F - Release
Copyright 2009, IDT, Inc.
All rights reserved.
7.1.2 Management Register Bit Access
The ICS1893BF Management Registers include one or more of the following types of bits:
7.1.3 Management Register Bit Default Values
The tables in this chapter specify for each register bit the default value, if one exists. The ICS1893BF sets
all Management Register bits to their default values after a reset. Table 7-4 lists the valid default values for
ICS1893BF Management Register bits.
Note: The ICS1893BF has a number of reserved bits throughout the Management Registers. Most of
these bits provide enhanced test modes. The Management Register tables provide the default
values for these bits. The STA must not change the value of these bits under any circumstance. If
the STA inadvertently changes the default values of these reserved register bits, normal operation
of the ICS1893BF can be affected.
Table 7-3. Description of Management Register Bit Types
Management
Register Bit Types
Bit
Symbol
Description
Read-Only
RO
An STA can obtain the value of a RO register bit. However, it cannot
alter the value of (that is, it cannot write to) an RO register bit. The
ICS1893BF isolates any STA attempt to write a value to an RO bit.
Command Override
Write
CW
An STA can read a value from a CW register bit. However, write
operations are conditional, based on the value of the Command
Register Override bit (bit 16.15). When bit 16.15 is logic:
Zero (the default), the ICS1893BF isolates STA attempts to write to
the CW bits (that is, CW bits cannot be altered when bit 16.15 is
logic zero).
One, the ICS1893BF permits an STA to alter the value of the CW
bits in the subsequent register write. (Bit 16.15 is self-clearing and
automatically clears to zero on the subsequent write.)
Read/Write
R/W
An STA can unconditionally read from or write to a R/W register bit.
Read/Write Zero
R/W0
An STA can unconditionally read from a R/W0 register bit, but only a
‘0’ value can be written to this bit.
Table 7-4. Range of Possible Valid Default Values for ICS1893BF Register Bits
Default Condition
Default Value
Indicates there is no default value for the bit
0
Indicates the bit’s default value is logic zero
1
Indicates the bit’s default value is logic one
State of pin at reset
For some bits, the default value depends on the state (that is, the logic value) of a
particular pin at reset (that is, the logic value of a pin is latched at reset). An
example of pins that have a default condition that depends on the state of the pin
at reset are the PHY / LED pins (P0AC, P1CL, P2LI, P3TD, and P4RD) discussed
in the following sections:
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