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參數(shù)資料
| 型號： | RTL8019AS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Realtek Full-Duplex Ethernet Controller with Plug and Play Function (RealPNP) |
| 中文描述： | 瑞昱全雙工以太網(wǎng)控制器即插即用功能（RealPNP） |
| 文件頁數(shù)： | 35/50頁 |
| 文件大?。?/td> | 992K |
| 代理商： | RTL8019AS |
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8019AS.doc
2001-05-10
·R￥bééa￥÷|3--¤￥q
SPECIFICATION
RTL8019AS
35
On power up, all PnP cards detect RSTDRV, set their CSN to 0, and enter the
Wait for Key
state.
There is a required 2 msec delay from either a RSTDRV or a PnP Reset command to any Plug and
Play port access to allow a card to load initial configuration information from a non-volatile device,
which is 9346 for RTL8019AS.
Cards in the
Wait for Key
state do not respond to any access to their auto-configuration ports until
the initiation key is detected. Cards 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 verify the selected
READ_DATA port address is not in conflict with any other devices by the isolation protocol.
Next, 72 pairs of reads are performed to the Serial Isolation register to isolate a card as described
previously. If the checksum read from the card is valid, then this means one card has been isolated.
The isolated card remains in the
Isolation
state while all other cards have failed the isolation
protocol and have returned to the
Sleep
state. The CSN on this card is set to a unique number.
Writing this value causes this card to transition to the
Config
state. Sending a Wake[0] command
causes this card to transition back to
Sleep
state and all cards with a CSN value of zero to
transition to the Isolation state. This entire process is repeated until no Plug and Play cards are
detected.
6.2.4. Reading Resource Data
Each PnP card supports a
resource data
structure stored in a non-volatile device (e.g. 9346) to
describe the resources supported and those requested by the functions on 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
Config
state. A card may get to the
Config
state by one of two different methods. A card enters the
Config
state in response to the card
"winning" the serial isolation protocol and having a CSN assigned. The card also enters the
Config
state in response to receiving a Wake[CSN] command that matches the card's CSN.
As described above, all Plug and Play cards function as if their serial identifier and their resource
data both come from the same serial device. As also stated above, the pointer to the serial device is
reset in response to any Wake[CSN] command. This implies that if a card enters the
Config
state
directly in response to a Wake[CSN] command, the 9-byte serial identifier must be read first before
the card resource data is accessed. The Vendor ID and Unique Serial Number is valid; however, the
checksum byte, when read in this way, is not valid. A card that enters the
Config
state after the
isolation protocol has been run has already accessed all 72 bits of the serial identifier and the first
read of the Resource Data register will return resource data.
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