參數(shù)資料
型號(hào)： RTL8019AS
廠商： Electronic Theatre Controls, Inc.
英文描述： Realtek Full-Duplex Ethernet Controller with Plug and Play Function (RealPNP)
中文描述： 瑞昱全雙工以太網(wǎng)控制器即插即用功能（RealPNP）
文件頁數(shù)： 23/50頁
文件大?。?/td> 992K
代理商： RTL8019AS
8019AS.doc
2001-05-10
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SPECIFICATION
RTL8019AS
23
5.2. Group 2: Plug and Play (PnP) Registers
Auto-configuration Ports
Three 8-bit I/O ports are defined for the PnP read/write operations. They are called Auto-
configuration ports and are listed below.
Port Name
Type
ADDRESS
W
279H (Printer status port)
WRITE_DATA
W
A79H (Printer status port + 800H)
READ_DATA
R
Relocatable in range 200H to 3FFH
The Plug and Play registers are accessed by first writing the address of the desired register, which is
called
"
Register Index
"
in the following paragraph, to the ADDRESS port, followed by a read of
data from the READ_DATA port or a write of data to the WRITE_DATA port. A write to the
ADDRESS port may be followed by any number of WRITE_DATA or READ_DATA accesses to
the same indexed register without the need to write to the ADDRESS port before each access.
The Address port is also the write destination of the initiation key, which will be described later.
Plug and Play Registers
The Plug and Play registers may be divided into card registers and logical device registers.
According to the Plug and Play specification, a PnP card may contain more than one logical devices.
The card registers are unique for each card. However, the logical device registers are repeated for
each logical device on the card. Furthermore, all card registers are card control registers, while the
logical device registers can be divided into logical device control registers and configuration
registers. Although an RTL8019AS card contains only one logical device, the following paragraph
still depicts the Plug and Play registers by the same PnP categorizing method.
p.s. Those registers or bits not mentioned below are all read only with value=0.
Location
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