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| 型號： | MC92602ZTA |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PBGA196 |
| 封裝： | 15 X 15 MM, 1.60 MM HEIGHT, 1 MM PITCH, MAPBGA-196 |
| 文件頁數(shù)： | 23/102頁 |
| 文件大小： | 1581K |
| 代理商： | MC92602ZTA |
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MOTOROLA
Chapter 2. Transmitter
2-7
Functional Description
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 clocks. 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
Loopback Test Mode
A special loopback mode is supported for test. Asserting LBE high, enables loopback mode
causing the data being driven on the link outputs to be looped back internally to the input
amplifier of the link’s receiver.
Loopback data is processed the same as normally received data. Loopback enables at-speed
self-test to be implemented for production test and for in-system self-test. The loopback
signals are electrically isolated from the link output signals. Therefore, if the outputs are
shorted, or otherwise restricted, the loopback signals still operate normally.
When in loopback mode, the loopback output enable signal, LBOE, controls the action of
the link output signals. When LBOE is low, the link outputs are undriven and are high
impedance. When LBOE is high, the link output signals 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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For More Information On This Product,
Go to: www.freescale.com
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