DM560P
V.90 Integrated Data/Fax/Voice/Speakerphone Modem Device Set
Preliminary
19
Version: DM560P-DS-P07
August 11, 2000
STATE
ISOLATION
ID BIT = "1H"
SD[1:0] = "01"
LEAVE SD[7:0]
IN HIGH-IMPEDANCE
NO
GET ONE BIT FROM SERIAL IDENTIFIER
READ FROM SERIAL ISOLATION REGISTER
YES
WAIT FOR NEXT READ FROM SERIAL ISOLATION REGISTER
SD[1:0] = "10"
STATE
SLEEP
YES
ID = 0
OTHER CARD ID = 1
READ ALL 72 BITS
FROM SERIAL
IDENTIFIER
DRIVE
"AAH" ON
SD[7:0]
AFTER I/O READ COMPLETES
FETCH NEXT ID BIT FROM
SERIAL IDENTIFIER
ONE CARD
ISOLATED
NO
YES
NO
YES
LEAVE SD[7:0]
IN HIGH IMPEDANCE
NO
DRIVE "55H" ON SD[7:0]
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
Serial Number
Vendor ID
BYTE
BYTE BYTE
BYTE
BYTE BYTE
BYTE
BYTE
BYTE
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
Table 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].
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