DM6381F datasheet(19/40 Pages) ETC

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DM336P

V.34 Integrated Data/ Fax/Voice/Speakerphone Modem Device Set

Final

Version: DM336P-DS-F02

August 15, 2000

(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,

08, 08, 22, 08, 00

30, 47, 01, f8, 03, f8, 03,

08, 08, 22, 10, 00

30, 47, 01, e8, 03, e8, 03,

08, 08, 22, 10, 00

30, 47, 01, e8, 02, e8, 02,

08, 08, 22, 08, 00

30, 47, 01, e8, 03, e8, 03,

08, 08, 22, 20, 00

30, 47, 01, e8, 02, e8, 02,

08, 08, 22, 20, 00

30, 47, 01, e8, 03, e8, 03,

08, 08, 22, b8, 9c

30, 47, 01, e8, 02, e8, 02,

08, 08, 22, b8, 9c

30, 47, 01, f8, 03, f8, 03,

08, 08, 22, b8, 9c

30, 47, 01, f8, 02, f8, 02,

08, 08, 22, b8, 9c

30, 47, 01, 00, 02, f8, 03,

08, 08, 22, b8, 9c

38, 79}

* 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

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.

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