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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） |
| 文件頁數(shù)： | 2/8頁 |
| 文件大?。?/td> | 73K |
| 代理商： | DNCM00 |
2
Lucent Technologies Inc.
DNCM00
10 Mbit/s Ethernet MAC ASIC Macrocell
Advance Data Sheet
August 1996
4
Signal Information
Table 1. Input Terminal Descriptions
Input
Terminal
TXC
Description
Transmit Clock.
timer logic.
Reset (Active-High).
logic in the transmitter, and state machines in the receiver.
Collision Detect (Active-High).
be active a minimum of two TXC cycles. COL is only sampled when appropriate, during half-
duplex transmit operations when TXE is active, and during the first 6.4
any (normal or aborted) transmission if ISQE is active.
MAC Full Duplex (Active-High).
Used to control half- or full-duplex operation. When MFDUP is
low, the COL input is monitored and the binary backoff algorithm is employed if collisions occur
during transmission. When MFDUP is low if CRS activates while the MAC's own packet is being
transmitted, the receiver is not enabled since the received packet is the MAC's own transmitted
packet. When MFDUP is high, the COL input is ignored during packet transmission and moni-
tored during intergap delay for the presence of SQE if the ISQE signal is not active. When
MFDUP is high, all packets are received regardless of the status of TXE.
Retry.
Used to control the total number of attempts (initial + retries after collision) the MAC will
make to transmit a packet. The total attempts follow the below table:
10 MHz, 50% duty cycle, continuously running. TXC clocks all transmitter and
RST
Assumed to be asynchronous. Used to reset state machines and critical
COL
Used to indicate a collision between two stations. Assumed to
μ
s of intergap time after
MFDUP
RETRY_1_,
RETRY_0_
RETRY_1_
0
0
1
1
Backoff Select (Active-High).
ing collision handling. If BSEL is high, the backoff algorithm is not used. The transmitter will jam
for 32 TXC cycles and attempt to retransmit after 9.6
follows the normal binary backoff algorithm following a collision.
Preamble Control.
Used to control the length of the preamble sequence preceding packet trans-
mission. The total bit count in the preamble (10101010... + 10101011) follows the below table:
RETRY_0_
0
1
0
1
ATTEMPTS
16
8
4
1
BSEL
Used to control whether the binary backoff algorithm is used dur-
μ
s of intergap time. If low, the transmitter
PREAM_1_,
PREAM_0_
PREAM_1_
0
0
1
1
Ignore SQE (Active-High).
during the first 6.4
Abort After Max Deferral (Active-High).
attempt if it has deferred for more than 24,288 TXC cycles. Deferring starts when the transmitter
is ready to transmit but is prevented from doing so because CRS is active. Defer time is not
cumulative. If the transmitter defers for 10,000 bit times, then transmits and collides, backs off,
and then has to defer again after completion of backoff, the deferral timer resets to 0 and restarts.
If DEFER is low, the transmitter will defer indefinitely.
Transmit Request (Active-High).
Used to request a packet transmission. TXREQ is a hand-
shake signal; it should be held high until TXACK is activated by the transmitter. TXREQ should
then not be reactivated until TXEOP is returned by the transmitter.
PREAM_0_
0
1
0
1
Used to ignore the SQE signal from the physical layer transceiver
s of interframe gap. If high, the SQE error flag will not set.
Used to force the transmitter to abort a transmission
Length
64 bits
56 bits
48 bits
40 bits
ISQE
μ
DEFER
TXREQ
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