DM336P 데이터 시트보기 (PDF) - Davicom Semiconductor, Inc.

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DM336P

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

Davicom Semiconductor, Inc. 

DM336P

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

(10) Reading Resource Data

Each PnP card supports a resource data structure

stored in a non-volatile device (e.g. 9346) that

describes the resources requested by the card. The

Plug and Play resource management software will

arbitrate resources and setup the logical device

configuration registers according to the resource data.

Card resource data may only be read from cards in

the Configuration state. A card may get to the

Configuration state by one of two different methods:

1) A card enters the Configuration state in response

to the card "winning" the serial isolation protocol and

having a CSN assigned, or 2) the card receives a

Wake[CSN] command that matches the card CSN.

As described above, all Plug and Play cards function

as if both of their serial identifiers and resource data

come from the same serial device. Similarly, the

pointer to the serial device is reset in response to any

Wake[CSN] command. This implies that if a card

enters the Configuration state directly from Sleep

state in response to a Wake[CSN] command, the 9-

byte serial identifier must be read first before the card

DM6383 Absolute Maximum Ratings*

Power Supply Voltage........................ -0.5V to +7.0V

Case Operating Temperature............... 0 oC to 85 oC

Storage Temperature ...................... -65 oC to 150 oC

Applied Voltage On Any Pin .....................................

......................................... - 0.5V ≤ VIN ≤ VDD+0.5V

resource data is accessed. Then the Vendor ID and

Unique Serial Number is valid. however, the

checksum byte, when read in this way, is not valid.

For a card that enters Configuration state / Isolation

state, the first read of the Resource Data Register will

report resource data.

Card resource data is read by first polling the Status

register and waiting for bit[0] to be set. When this bit is

set, one byte of resource data is ready to be read

from the Resource Data Register. After the Resource

Data Register is read, the Status Register must be

polled before reading the next byte of resource data.

This process will repeat until all resource data is read.

The above operation implies that the hardware is

responsible for accumulating 8 bits of data in the

Resource Data Register. When this operation is

complete, the status bit [0] is set. When a read is

performed on the Resource Data Register, status bit

[0] is cleared, eight more bits are shifted into the

Resource Data Register, and the status bit[0] is set

again.

*Comments

Stresses above those listed under "Absolute

Maximum Ratings" may cause permanent damage to

this device. These are stress ratings only. Functional

operation of this device at these or any other

conditions above those indicated in the operational

sections of this specification is not implied or

intended. Exposure to absolute maximum rating

conditions for extended periods may affect device

reliability.

20

Final

Version: DM336P-DS-F02

August 15, 2000

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