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參數(shù)資料
| 型號(hào)： | DNCM00 |
| 廠商： | Lineage Power |
| 英文描述： | 10 Mbit/s Ethernet MAC ASIC Macrocell(10 M位/秒以太網(wǎng)MAC ASIC宏單元) |
| 中文描述： | 10 Mbit / s的以太網(wǎng)MAC ASIC的宏單元（位10米/秒以太網(wǎng)的MAC ASIC的宏單元） |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 73K |
| 代理商： | DNCM00 |
4
Lucent Technologies Inc.
DNCM00
10 Mbit/s Ethernet MAC ASIC Macrocell
Advance Data Sheet
August 1996
4
Signal Information
(continued)
Table 2. Output Terminal Descriptions
Output Terminal
TXACK
Description
Transmit Acknowledge (Active-High) (posedge TXC).
as a handshake. When TXACK goes high in response to TXREQ, TXREQ can be deacti-
vated.
Transmit in Progress (Active-High) (posedge TXC).
transmitting preamble, data, or CRC. It is not active if jamming or during collision backoff.
Transmit Data (posedge TXC).
Serial transmit data out.
Transmit Load (Active-High) (posedge TXC).
requires a byte of data for transmission. TXDB_[7:0]_ will be strobed into the transmit shift
register on the falling edge of TXLD.
Transmit End of Operation (Active-High) (posedge TXC).
transmit operation. The operation may end because of successful transmission, excessive
collisions, excess deferral, or an ABORT command. TXEOP is active for one TXC cycle.
Transmit statistics, except for SQE, can be monitored after TXEOP activates. SQE should
be latched on the falling edge of TXSOP of the following frame.
Late Collision (Active-High) (posedge TXC).
512 bit times from the start of a transmission. The start of transmission is defined as the
transmission of the first bit of preamble.
Excess Deferral
(Active-High) (posedge TXC).
waiting for more than 24,288 bit times for the medium to become unbusy.
Deferred (Active-High) (posedge TXC).
Indicates that a transmission deferred for 1 to
24,288 bit times during transmission.
Collision Detected (Active-High) (posedge TXC).
detected. This signal is active from the time a collision was detected until the completion of
the 32-bit jam sequence. The COL signal is monitored only when the transmitter is actively
transmitting data.
Single Collision
(Active-High) (posedge TXC).
ing transmission of the previous packet.
Multiple Collisions
(Active-High) (posedge TXC).
collision during transmission of the previous packet.
Collision Error
(Active-High) (posedge TXC).
was stopped because of excessive collisions as allowed by the RETRY_[1:0]_ inputs. SCOL
or MCOL are also valid if CERR is active.
Loss of CRS (Active-High) (posedge TXC).
Indicates that the CRS input was inactive for
one or more bit times while the transmitter was active.
Signal Quality Error
(Active-High) (posedge TXC).
detected during the first 6.4
μ
s of interframe gap following a transmit attempt. SQE is inac-
tive if the ISQE input is high.
Byte Transmitted
(Active-High) (posedge TXC).
CRC has been transmitted. TXBYTE is valid for 1 TXC bit time immediately after the last bit
of a byte was transmitted.
Transmit Start of Packet
(Active-High) (posedge TXC).
preamble.
Transmit Enable
(Active-High) (posedge TXC).
valid.
Receive Byte Count (posedge RXC)
. Indicates the number of full bytes received in the
current packet. This counter freezes at FFFF(hex) bytes.
Used in conjunction with TXREQ
TXINPROG
Set high if the MAC is currently
TXD
TXLD
Used to tell the DMAC that the transmitter
TXEOP
Used to indicate the end of a
LATE
Indicates that a collision occurred more than
EXDEF
Indicates transmission ended because of
DEF
COLDET
Indicates that a collision has been
SCOL
Indicates that there was one collision dur-
MCOL
Indicates that there was more than one
CERR
Indicates that the previous transmission
LCRS
SQE
Indicates that a COL signal was not
TXBYTE
Indicates that a complete byte of data or
TXSOP
Active for 1 bit time at the start of
TXE
Indicates that data on the TXD line is
RXCOUNT_[15:0]_
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