參數(shù)資料
型號： 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)： 31/50頁
文件大?。?/td> 992K
代理商： RTL8019AS
8019AS.doc
2001-05-10
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SPECIFICATION
RTL8019AS
31
Serial Identifier
The key element of the Plug and Play isolation protocol is that each card contains a unique number,
named
serial identifier
. The serial identifier is a 72-bit unique, non-zero number composed of two
32-bit fields and an 8-bit checksum. The first 32-bit field is a vendor identifier. The other 32-bits
can be any value, for example, a serial number, part of a LAN address, or a static number, as long
as there will never be two cards in a single system with the same 64-bit number. The serial identifier
is accessed bit-serially by the isolation logic and is used to differentiate the cards.
Check-
sum
Byte 0
Byte 3
Byte 2
Byte 1
Byte 0
Byte 3
Serial Number
Vendor ID
Byte 2
Byte 1
Byte 0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
Shift
Figure 2. Shifting of Serial Identifier
The shift order for all Plug and Play serial isolation and resource data is defined as bit[0], bit[1],
and so on through bit[7].
Hardware Protocol
The isolation protocol can be invoked by the Plug and Play software at any time. The initiation key
described earlier, puts all cards into configuration mode. The hardware on each card expects 72
pairs of I/O read accesses to the READ_DATA port. The card's response to these reads depends
on the value of each bit of the serial identifier which is being examined one bit at a time, in the
sequence shown in Figure 1.
If the current bit of the serial identifier is a "1", then the card will drive the data bus to 55H to
complete the first I/O read cycle. If the bit is "0", then the card puts its data bus driver into high
impedance. All cards in high impedance will check the data bus during the I/O read cycle to sense if
another card is driving SD[1:0] to "01". During the second I/O read, the card(s) that drove the 55H,
will now drive a AAH. All high impedance card will check the data bus to sense if another card is
driving SD[1:0] to "10."
If a high impedance card sensed another card driving the data bus with the appropriate data during
both cycles, then that card ceases to participate in the current iteration of card isolation. Such cards,
which lose out, will participate in future iterations of the isolation protocol.
NOTE:
During each read cycle, the Plug and Play hardware drives the entire 8-bit data bus, but
only checks the lower 2 bits.
If a card was driving the bus or if the card was in high impedance and did not sense another card
driving the bus, then it should prepare for the next pair of I/O reads. The card shifts the serial
identifier by one bit and uses the shifted bit to decide its response.
The above sequence is repeated for the entire 72-bit serial identifier.
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