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參數(shù)資料
| 型號： | AM79C971 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
| 中文描述： | PCnet⑩快速單芯片全雙工10/100 Mbps以太網(wǎng)控制器，PCI總線 |
| 文件頁數(shù)： | 24/265頁 |
| 文件大?。?/td> | 3190K |
| 代理商： | AM79C971 |
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24
Am79C971
nibble of the frame. TX_EN transitions synchronous to
TX_CLK rising edges.
Note:
The TX_EN pin is multiplexed with the TXEN
pin.
When RST is active, TX_EN is an input for NAND tree
testing
.
If the MII port is not selected, the TX_EN pin can be left
floating.
TX_ER
Transmit Error
TX_ER is an output that, if asserted while TX_EN is as-
serted, instructs the MII PHY device connected to the
Am79C971 device to transmit a code group error.
TX_ER is unused and is reserved for future use and will
always be driven to a logical zero.
Output
When RST is active, TX_ER is an input for NAND tree
testing
.
If the MII port is not selected, the TX_ER pin can be left
floating.
COL
Collision
COL is an input that indicates that a collision has been
detected on the network medium.
Input
Note:
The COL pin is multiplexed with the CLSN pin.
When RST is active, COL is an input for NAND tree
testing
.
If the MII port is not selected, the COL pin can be left
floating.
CRS
Carrier Sense
CRS is an input that indicates that a non-idle medium,
due either to transmit or receive activity, has been de-
tected.
Input
Note:
The CRS pin is multiplexed with the RXEN pin.
When RST is active, CRS is an input for NAND tree
testing
.
If the MII port is not selected, the CRS pin can be left
floating.
RX_CLK
Receive Clock
RX_CLK is a clock input that provides the timing refer-
ence for the transfer of the RX_DV, RXD[3:0], and
RX_ER signals into the Am79C971 device. RX_CLK
must provide a nibble rate clock (25% of the network
data rate). Hence, an MII transceiver operating at 10
Mbps must provide an RX_CLK frequency of 2.5 MHz
and an MII transceiver operating at 100 Mbps must pro-
vide an RX_CLK frequency of 25 MHz. When the exter-
Input
nal PHY switches the RX_CLK and TX_CLK, it
must
provide glitch-free clock pulses.
Note:
The RX_CLK pin is multiplexed with the RXCLK
pin.
When RST is active, RX_CLK is an input for NAND tree
testing
.
If the MII port is not selected, the RX_CLK pin can be
left floating.
RXD[3:0]
Receive Data
RXD[3:0] is the nibble-wide MII receive data bus. Data
on RXD[3:0] is sampled on every rising edge of
RX_CLK while RX_DV is asserted. RXD[3:0] is ignored
while RX_DV is de-asserted.
Input
When the EADI is enabled (EADISEL, BCR2, bit 3) and
the Receive Frame Tagging is enabled (RXFRTG,
CSR7, bit 14) and the MII is
not
selected, the RXD[0]
pin becomes a data input pin for the Receive Frame
Tag (RXFRTGD). See the
Receive Frame Tagging
sec-
tion for details.
Note:
The RXD[0] pin is multiplexed with the
RXFRTGD pin.
When RST is active, RXD[3:0] are inputs for NAND tree
testing
.
If the MII port is not selected, the RXS[3:0] pin can be
left floating.
RX_DV
Receive Data Valid
RX_DV is an input used to indicate that valid received
data is being presented on the RXD[3:0] pins and
RX_CLK is synchronous to the receive data. In order
for a frame to be fully received by the Am79C971 de-
vice on the MII, RX_DV must be asserted prior to the
RX_CLK rising edge, when the first nibble of the Start
of Frame Delimiter is driven on RXD[3:0], and must re-
main asserted until after the rising edge of RX_CLK,
when the last nibble of the CRC is driven on RXD[3:0].
RX_DV must then be deasserted prior to the RX_CLK
rising edge which follows this final nibble. RX_DV tran-
sitions are synchronous to RX_CLK rising edges.
Input
When the EADI is enabled (EADISEL, BCR2, bit 3), the
Receive Frame Tagging is enabled (RXFRTG, CSR7,
bit 14), and the MII is
not
selected, the RX_DV pin be-
comes a data input enable pin for the Receive Frame
Tag (RXFRTGE). See the
Receive Frame Tagging
sec-
tion for details.
Note:
The RX_DV pin is multiplexed with the
RXFRTGE pin.
When RST is active, RX_DV is an input for NAND tree
testing
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C971KCW | IC LOGIC 16211 24-BIT FET BUS SWITCH -40+85C TSSOP-56 35/TUBE |
| AM79C972BKCW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BKIW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BVCW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972 | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C971AKC | 制造商:Advanced Micro Devices 功能描述: |
| AM79C971AVC | 制造商:Advanced Micro Devices 功能描述:10/100 MBPS ETHERNET - Trays |
| AM79C971AVC\\W | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AM79C971AVC\W | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AM79C971AWW WAF | 制造商:Advanced Micro Devices 功能描述: |
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