 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
DP83858VF Datasheet(PDF) 7 Page - National Semiconductor (TI) |
|
|
||||||||||||||||||||||||||||||
DP83858VF Datasheet(HTML) 7 Page - National Semiconductor (TI) |
|
|
7 / 37 page  7 http:\\www.national.com 2.2 Inter Repeater and Management Bus Interface Signal Name Type Active Description IRD[3:0] I/O/Z, M — Inter Repeater Data: Nibble data input/output. Transfers data from the “active” DP83858 to all other “inactive” DP83858s. The bus master of the IRD bus is deter- mined by IR_VECT bus arbitration. Note: Input buffer has a weak pull-up. /IRD_ER I/O/Z, M low Inter Repeater Data Error: This signal carries the RX_ER state across the Inter Re- peater bus. Used to track receive errors from the physical layer in real-time /IRD_V I/O/Z, M low Inter Repeater Data Valid: This signal carries the inverted RX_DV state across the Inter Repeater bus. It is used to frame good packets. Note: A recommended 1.5K pull-up prevents first repeated packet corruption . IRD_CK I/O/Z, M — Inter Repeater Data Clock: All Inter Repeater signals are synchronized to the rising edge of this clock. Note: Input buffer has a weak pull-up. IRD_ODIR O, L high Inter Repeater Data Outward Direction: This pin indicates the direction of data for an external transceiver. It is HIGH when IRD[3:0], /IRD_V, /IRD_CK, and /IRD_ER are driven out towards the Inter Repeater bus, and LOW when data is being received from the bus. /IR_ACTIVE I/O/OC, M low Inter Repeater Activity: This “open-collector” type output is asserted when the re- peater senses network activity. Note: Input buffer has a weak pull-up. /IR_COL_IN I low Inter Repeater Collision In: Indication from another DP83858 that it senses two or more ports receiving or another DP83858 has detected a collision. Note: Input buffer has a weak pull-up. /IR_COL_OUT O/OC, M low Inter Repeater Collision Out: Asserted when the DP83858 senses two or more ports receiving or non-idle, either 1) within this DP83858 or 2) in another DP83858, using the IR_VECT number to decide (the IR_VECT number read will differ from the number of this DP83858 if another device is active). IR_VECT[4:0] I/O/OC, M high Inter Repeater Vector: When the repeater senses at least one of its ports active, it drives its unique vector (from RID[4:0]) onto these pins. If the vector value read back differs from its own (because another vector is being asserted by another device), then this DP83858 will: 1) not drive IRD_ODIR signal and, 2) tri-states the IRD[3:0], /IRD_ER, /IRD_V, and IRD_CK signals. However, if the value read back is the same as its own RID number, this DP83858 will continue to drive the Inter Repeater bus signals. Note that these vectors are driven onto the bus for the duration of /ACTIVEO assertion. Note: Input buffer has a weak pull-up. MD[3:0] I/O/Z, M high Management Data: Outputs management information for the DP83856 manage- ment chip. During packet reception the DP83858 drives its RID number and the port number of the receiving port onto this bus. Note: Input buffer has a weak pull-up. /M_DV I/O/Z, M low Management Data Valid: Asserted when valid data is present on MD[3:0]. Note: Input buffer has a weak pull-up. M_CK I/O/Z, M — Management Clock: All data transfers on the management bus are synchronize to the rising edge of this clock. Note: Input buffer has a weak pull-up. /M_ER I/O/Z, M low Management Error: Asserted when an Elasticity Buffer overrun or under-run error has been detected. Note: Input buffer has a weak pull-up. /IR_BUS_EN O,L low Inter-Repeater Bus Enable: This signal is asserted at all times (either when the 100RIC8 is driving the bus or receiving from the bus) and it is deasserted only when the 100RIC8 switches direction from an input (receiving) mode to an output (driving) mode. After this switch, this signal becomes asserted again. |
Similar Part No. - DP83858VF |
|
Similar Description - DP83858VF |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
