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參數(shù)資料
| 型號(hào)： | 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)： | 40/102頁 |
| 文件大?。?/td> | 1581K |
| 代理商： | MC92602ZTA |
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3-14
MC92602 SerDes Reference Manual
MOTOROLA
Functional Description
NOTE
The compatibility mode control signal, COMPAT, set high,
instructs the receivers to follow a different set of rules for the
addition and deletion of characters that are non-intrusive to
packet data streams, but still enable the device to maintain
synchronization between the clock domains. See Section 5.4,
“Configuration and Control Signals,” for more information.
A sufficient number of idles must be transmitted to guard against overrun. The frequency
of idles can be computed based on the maximum frequency offset between transmitter and
receiver in the system. The number of bytes (characters) that can be transmitted between
idles is:
(2
× 106/N) – 1 byte
where: N is the frequency offset in ppm.
In an underrun situation, data must be added in order to maintain synchronization between
the clock domains. If ADIE is high, the receiver interface adds a pair of idle bytes when
underrun is imminent. The pair of idles will be inserted prior to the next pair of idles in the
data stream. This allows the user to establish ‘packets’ of data that do not contain idles and
the MC92602 will not insert idles in the middle of these ‘packets.’ The idle frequency to
prevent underruns is identical to the frequency to prevent overruns, so the same conditions
apply. If ADIE is disabled and an underrun occurs, the ‘underrun” error is reported as
described in Section 3.3.6.3, “Receiver Interface Error Codes,” for a 1-byte clock period.
The proper phase of the REF_CLK will be provided on RECV_n_CLK.
NOTE
When operating in ‘word’ mode all configured channels must
add/delete idles simultaneously. Therefore, idles must appear
in the data stream for all channels simultaneously, so that idles
may be inserted (adjacent to existing idles) or deleted.
3.3.8
Half-Speed Mode
Half-speed mode, enabled when HSE is asserted high, operates the receiver in its lower
speed range. In half-speed mode, the link speed is 500 Mbps (625 Mbaud.) The receiver
interface operates at half speed and in pace with received data.
3.3.9
Repeater Mode
Repeater mode is not recommended for application use. It is used for factory engineering
and manufacturing test purposes only. The repeater enable signal, REPE, should be
configured low during normal operation.
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