DM336P 查看數據表（PDF） - Davicom Semiconductor, Inc.
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DM336P Datasheet PDF : 40 Pages
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DM336P
V.34 Integrated Data/ Fax/Voice/Speakerphone Modem Device Set
(9) Isolation and Resource Data
DM6383 built in 64-bytes SRAM that can be accessed
by micro-controller an PnP Isolation and Resource
Data Registers. Through port F800H, micro-controller
can load serial data and part of resource data to
SRAM byte by byte. It is important to note that the
length of the data frame to be programmed should be
loaded first, next, isolation data, and then resource
data port.
When a read from PnP resource data register occurs,
the data stored in SRAM will be sent to ISA data bus,
and then the data pointer will be added by 1. Once the
data pointer is equivalent to the data length, the next
data read will change the pointer value to the
beginning of resource data block and describe the
other fixed resource data.
Resource Data Block ={ 30, 47, 01, f8, 02, f8, 02,
30, 47, 01, f8, 03, f8, 03,
30, 47, 01, e8, 03, e8, 03,
30, 47, 01, e8, 02, e8, 02,
30, 47, 01, e8, 03, e8, 03,
30, 47, 01, e8, 02, e8, 02,
30, 47, 01, e8, 03, e8, 03,
30, 47, 01, e8, 02, e8, 02,
30, 47, 01, f8, 03, f8, 03,
30, 47, 01, f8, 02, f8, 02,
30, 47, 01, 00, 02, f8, 03,
38, 79}
08, 08, 22, 08, 00
08, 08, 22, 10, 00
08, 08, 22, 10, 00
08, 08, 22, 08, 00
08, 08, 22, 20, 00
08, 08, 22, 20, 00
08, 08, 22, b8, 9c
08, 08, 22, b8, 9c
08, 08, 22, b8, 9c
08, 08, 22, b8, 9c
08, 08, 22, b8, 9c
* The data pointer will return to 1 when a Hardware Reset or Software Wake[CSN] is occurred.
On powering up, modem card detects RSTDRV, sets
CSN to 0, loads isolation data and resource data to
built-in 64-bytes SRAM, programs Auto-configuration
Register, configures hardware from Auto-
configuration Register, and then enters the Wait for
Key state. There is a required 2 msec delay from
either a RSTRDV or a PnP Reset command to any
Plug and Play access to allow a card to load these
information via internal micro-controller.
Cards in the Wait For Key state will not acknowledge
any access to their auto-configuration ports until the
Initiation Key is detected and they ignore all ISA
access to their Plug and Play interface. When the
cards have received the initiation key, they enter the
Sleep state. In this state, the cards listen for a Wake
[CSN] command with the write data set to 00H. This
Wake[CSN] command will send all cards to the
Isolation state and reset the serial identifier/resource
data pointer to the beginning.
The first time the cards enter the Isolation state, it is
necessary to set the READ_DATA port address using
the Set RD_DATA port command. The software
should then use isolation protocol to check the
selected READ_DATA port address and to see if it is
in conflict with any other device.
Next, 72 pairs of reads are performed to the Serial
Isolation Register to isolate a card, as previously
described. When the checksum read from the card is
valid, it means the card is already isolated. The
isolated card remains in the Isolation state, while all
other cards fail the isolation protocol and are returned
to the Sleep state. The CSN on the isolated card is
set to a unique number, causing this card to change
to the Configuration state. Sending a Wake[0]
command causes this card to change back to Sleep
state, and all cards with a CSN value of zero to
change to the Isolation state. This entire process will
repeat until no Plug and Play cards are detected.
Final
19
Version: DM336P-DS-F02
August 15, 2000
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