參數(shù)資料
型號(hào)： MC68EN302PV25BT
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
封裝： 20 X 20 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, PLASITC, LQFP-144
文件頁數(shù)： 86/128頁
文件大小： 641K
代理商： MC68EN302PV25BT
ETHERNET Controller
MOTOROLA
MC68EN302 REFERENCE MANUAL
4-21
— Guarantees minimum inter-frame gap (IFG) of 9.6
sec between CarrierSense
deasserted and next frame transmitted.
— Provides 8 byte PA + SFD
— Appends 32 bit JAM sequence (all 1’s) and start backoff timer upon collision
— Appends 32 bit CRC (if TC = 1) or bad CRC if aborting frame
— Defers to CarrierSense for 6
sec, then ignores CarrierSense for 3.6 sec during
InterFrameGap
— Collision Retry occurs under the 802.3 truncated binary exponential backoff
algorithm
— Detects a babbling transmission and generates BABT interrupt
— Aborts Frame transmission if Transmit FIFO underflow, ETHER_EN deassertion
during frame transmission, Collision Retry Limit exceeded, Late Collision or
Collision and DRTY = 1
Provides Transmit Frame Status
— Generates the DEF, HB, LC, RL, RC, UN and CSL status fields written into the end
of frame transmit buffer descriptor which provide status on the transmission of the
frame. The definition of these fields is based on the Layer Management section of
the 802.3 standard. These fields are valid after the heartbeat window following the
successful transmission of a frame or if the collision retry limit (16 attempts) is
exceeded. A “XmitStatusReady” signal is asserted to the transmit buffer descriptor
control logic when this status is available
All logic in the Ethernet Transmit block runs synchronously with the Ethernet TCLK provided
by an external Ethernet physical layer component(s).
NOTE
Deasserting ETHER_EN during frame transmission is NOT
recommended as ETHER_EN is used as a reset signal in the
Ethernet controller logic. The recommended procedure is to
assert the GTS bit to gracefully halt transmission. Once the GRA
interrupt is received indicating that transmission has completed,
then deassert ETHER_EN.
4.5.2 ETHERNET RECEIVE
The receive block consists of the following submodules:
Serial to Parallel Conversion
Receive Protocol Control
— Controls data path by stripping PA, SFD, and dribble bits
— Detects runt frames, and signals REJECT to the receive FIFO
— Detects giant frames, generates the BABR interrupt and discards the rest of frame
— Provides count to determine frame length (in bytes)
— Provides for interframe recovery if a minimum receive interframe gap of
approximately 2.4
sec is provided.
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