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參數(shù)資料
| 型號： | MC92602ZTA |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PBGA196 |
| 封裝： | MAPBGA-196 |
| 文件頁數(shù)： | 22/98頁 |
| 文件大?。?/td> | 896K |
| 代理商： | MC92602ZTA |
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MOTOROLA
Chapter 2. Transmitter
2-7
Functional Description
The Transmit Driver is a controlled impedance driver. The impedance of the driver is
programmable to 50
or 75 through the MEDIA signal. Drive impedance is 50 when
the control signal, MEDIA, is low and 75
when MEDIA is high.
2.3.4
Transceiver Disable
Each individual transceiver may be disabled with the appropriate XCVR_x_DISABLE
signal. The XCVR_x_DISABLE control signal also has a secondary function when used in
association with the receiver control signal DROP_SYNC that allows external forcing of
loss of byte synchronization on an individual channel basis. The relationship of these two
control signals is shown in Table 2-5.
When Drop_Sync is high, XCVR_x_DISABLE has no effect on the function of the
transmitter. Rather when asserted high it is used to perform the loss of synchronization on
the selected channel
NOTE
Since
DROP_SYNC
and
XCVR_x_DISABLE
are
asynchronous signals (relative to the internal clocks) they must
be asserted for two or more cocks. DROP_SYNC should be
raised prior to XCVR_x_DISABLE and lowered after
XCVR_x_DISABLE.
To
assure
proper
action
raise
DROP_SYNC on clock #1, raise XCVR_x_DISABLE on
clock #2, lower XCVR_x_DISABLE on Clock #n (n must be 4
or greater), then lower DROP_SYNC on Clock #n+1.
2.3.5
Loop-Back Test Mode
A special loop-back mode is supported for test. Asserting LBE high, enables loop-back
mode causing the data being driven on the link outputs to be looped back, internally, to the
input amplier of the link’s receiver.
Loop-back data is processed the same as normally received data. Loop-back enables
at-speed self-test to be implemented for production test and for in-system self-test. The
loop-back signals are electrically isolated from the link output signals. Therefore, if the
outputs are shorted, or otherwise restricted, the loop-back signals still operate normally.
Table 2-5. Transceiver Disable - Channel Drop Sync Operation
XCVR_x_DISABLE
DROP_SYNC
ACTION
low
Transceiver Channel Active - normal operation
high
low
Transceiver channel “x” disabled
low
high
Transceiver channel active - normal operation
high
Transmitter “x” active; Receiver “x” is forced to “Drop Sync”
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| MC92604ZT | 功能描述:IC TXRX ETH DUAL GIG 196-MAPBGA RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:25 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:4.5 V ~ 5.5 V 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 供應商設備封裝:16-PDIP 包裝:管件 |
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