DM560P
V.90 Integrated Data/Fax/Voice/Speakerphone Modem Device Set
16
Preliminary
Version: DM560P-DS-P07
August 11, 2000
Plug and Play (PnP) Module
Auto-configuration Ports
Three 8-bit I/O ports are defined for Plug and Play
read/write operations. They are called Auto-
configuration ports as listed below.
Port
Type
Location
ADDRESS W
0279H
(Printer status port)
WRITE_
DATA
W
0A79H
(Printer status port + 0800H)
READ_
DATA
R
Relocatable in range
0203H to 03FFH
To access the Plug and Play Register, a host should
follow this procedure: Write a target register address
(Register Index), choose a port (WRITE_DATA or
READ_DATA), then enter data.
The Plug and Play Register could be directly accessed
without the need to write to the ADDRESS port before
each access. The ADDESS 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 & Play specification, if a PnP card contains
more than one logical device, there are one more
copies of Logical Device Registers in the PnP card.
However, the DM6583A contains only one logical
device, the Card Register and Logical Device
Registers are unique for each card. Those PnP
registers or bits not defined below are all read with
value = 0.
Card Control Registers
Index
Name
Type
Definition
00H
Set RD_DATA port
W
The location of the READ_DATA port is determined by writing to this
register. Bits [7:0] become ISA I/O read port address bits [9:2]. Address
bits [1:0] of the READ_DATA port are always 1.
01H
Serial Isolation
R
A read to this register causes a PnP card in the Isolation state to compare
one bit of the card serial ID. This process is described in more detail in the
next section.
02H
Config Control
W
Bit [0] - Reset Command Setting
This bit will reset all logical devices and restore configuration registers to
their power-up values. The CSN is preserved.
Bit [1] - Wait for Key Command Setting
This bit makes the PnP card return to the Wait for Key state. The CSN is
preserved.
Bit [2] - PnP Reset CSN Command Setting
This bit will reset the card CSN to 0. Note that the hardware will
automatically clear the bits without any need for software to clear them.
03H
Wake [CSN]
W
A write to this register will cause all cards that have a CSN that matches the
write data [7:0] to go from the Sleep state to either the 1) Isolation state if the
write data for this command is zero, or 2) Configuration state if the write
data is not zero.
04H
Resource Data
R
A read from this register reads the next byte of resource data. The Status
Register must be polled until bit[0] is set before this register may be read.
05H
Status
R
Bit [0], when set, indicates it is ready to read the next data byte from the
Resource Data Register.
06H
Card Select Number
(CSN)
R/W A write to this register sets a card CSN. After a serial identification process,
the CSN value (CSN) is uniquely assigned to each ISA PnP card so that
each card may be individually selected during a Wake[CSN] command.
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