DM560P 查看數據表（PDF） - Davicom Semiconductor, Inc.
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DM560P Datasheet PDF : 43 Pages
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DM560P
V.90 Integrated Data/Fax/Voice/Speakerphone Modem Device Set
STATE
ISOLATION
READ FROM SERIAL ISOLATION REGISTER
GET ONE BIT FROM SERIAL IDENTIFIER
DRIVE "55H" ON SD[7:0]
YES
ID BIT = "1H"
NO
LEAVE SD[7:0]
IN HIGH-IMPEDANCE
NO
SD[1:0] = "01"
YES
WAIT FOR NEXT READ FROM SERIAL ISOLATION REGISTER
DRIVE
"AAH" ON
SD[7:0]
LEAVE SD[7:0]
IN HIGH IMPEDANCE
NO
SD[1:0] = "10"
NO
AFTER I/O READ COMPLETES
FETCH NEXT ID BIT FROM
SERIAL IDENTIFIER
READ ALL 72 BITS
FROM SERIAL
IDENTIFIER
YES
STATE
SLEEP
ID = 0
OTHER CARD ID = 1
YES
ONE CARD
ISOLATED
Serial Identifier
The key element of the Plug and Play isolation
protocol is that each card contains a unique number
called a 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, such as a serial number, part
of a LAN address, or a static number, as long as no
two cards in a single system will ever have the same
64-bit number. The serial identifier is accessed bit-
serially by isolation logic, and is used to differentiate
the cards.
Checksum
BYTE
7:0
Serial Number
Vendor ID
BYTE BYTE BYTE BYTE BYTE BYTE BYTE
7:0 7:0 7:0 7:0 7:0 7:0
7:0
Table 2. Shifting of Serial Identifier
BYTE
7:0
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].
Preliminary
19
Version: DM560P-DS-P07
August 11, 2000
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