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DP83821VUW Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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DP83821VUW Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 86 page 3 www.national.com 2.0 Pin Descriptions PCI Interface Symbol Pin No(s) Direction Description AD31-0 188, 189, 190, 191, 192, 193, 194, 195, 199, 200, 202, 203, 204, 207, 208, 1, 14, 15, 17, 18, 19, 21, 22, 23, 25, 26, 28, 29, 31, 32, 33, 34 I/O Address and Data: Multiplexed address and data bus. As a bus master, the DP83821 will drive address during the first bus phase. During subsequent phases, the DP83821 will either read or write data expecting the target to increment its address pointer. As a bus target, the DP83821 will decode each address on the bus and respond if it is the target being addressed. CBEN3-0 197, 2, 13, 24 I/O Bus Command/Byte Enable: During the address phase these signals define the “bus command” or the type of bus transaction that will take place. During the data phase these pins indicate which byte lanes contain valid data. CBEN0 applies to byte 0 (bits 7-0) and CBEN3 applies to byte 3(bits 31-24). PCICLK 176 I Clock: This PCI Bus clock provides timing for all bus phases. The rising edge defines the start of each phase. The clock frequency ranges from 0 to 33 MHz. DEVSELN 8 I/O Device Select: As a target, the DP83821 asserts this signal low when it recognizes its address after FRAMEN is asserted. As a bus master, the DP83821 samples this signal to insure that the destination address for the data transfer is recognized by a PCI target. FRAMEN 4 I/O Frame: As a bus master, this signal is asserted low to indicate the beginning and duration of a bus transaction. Data transfer takes place when this signal is asserted. It is de-asserted before the transaction is in its final phase. As a target, the device monitors this signal before decoding the address to check if the current transaction is addressed to it. GNTN 185 I Grant: This signal is asserted low to indicate to the DP83821 that it has been granted ownership of the bus by the central arbiter. This input is used when the DP83821 is acting as a bus master. IDSEL 198 I Initialization Device Select: This pin is sampled by the DP83821 to identify when configuration read and write accesses are intended for it. INTAN 183 O Interrupt A: This signal is asserted low when an interrupt condition as defined in the Interrupt Status Register, Interrupt Mask, and Interrupt Enable registers occurs. IRDYN 5 I/O Initiator Ready: As a bus master, this signal will be asserted low when the DP83821 is ready to complete the current data phase transaction. This signal is used in conjunction with the TRYDN signal. Data transaction takes place at the rising edge of PCICLK when both IRDYN and TRDYN are asserted low. As a target, this signal indicates that the master has put the data on the bus. PAR 12 I/O Parity: This signal indicates even parity across AD31-0 and CBEN3-0 including the PAR pin. As a master, PAR is asserted during address and write data phases. As a target, PAR is asserted during read data phases. PERRN 10 I/O Parity Error: The DP83821 as a master or target will assert this signal low to indicate a parity error on any incoming data (except for special cycles). As a bus master, it will monitor this signal on all write operations (except for special cycles). REQN 186 O Request: The DP83821 will assert this signal low to request the ownership of the bus to the central arbiter. RSTN 184 I Reset: When this signal is asserted all outputs of DP83821 will be tri-stated and the device will be put into a known state. |
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