參數(shù)資料
型號(hào)： MC92600ZTB
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, PLASTIC, MAPBGA-196
文件頁數(shù)： 17/98頁
文件大小： 1288K
代理商： MC92600ZTB
2-4
MC92600 SERDES User’s Manual
MOTOROLA
Transmission Modes
2.3
Transmission Modes
MC92600 accepts two transmission modes: double data rate mode and repeater mode.
2.3.1
Double Data Rate Mode
Double data rate (DDR) mode enables sampling and storage of the data inputs to the
transmitter on the rising and falling edges of REF_CLK. Data is placed in the transmit data
input register. DDR mode is used to lower reference clock frequency while maintaining
throughput, reducing board design complications. Table 4-1, "Legal Reference Clock
Frequency Ranges” shows legal reference clock frequencies for all modes of operation.
DDR mode is enabled by asserting DDRE.
2.3.2
Repeater Mode
Repeater mode congures the MC92600 into a 4-link receive-transmit repeater so that data
can enter serially and exit serially. In this mode, the data to transmit is obtained from its
receiver (transmitter A gets receiver A’s data, transmitter B gets receiver B’s data, and so
on). The transmit input signals, XMIT_x_7 through XMIT_x_0, XMIT_x_K, and
XMIT_x_IDLE are ignored. Repeater mode is enabled by setting REPE high.
In repeater mode transmit data is sampled and stored in the transmit data input register on
the rising edge of the reference clock (REF_CLK). See Section 3.5.4.5, “Repeater Mode”
for more information on repeater mode.
NOTE
When using repeater mode ground all parallel inputs because
input I/Os do not have internal pulldowns.
MEDIA
Media impedance select Indicates the impedance of the
transmission media. Low indicates 50
and high indicates 75
.
Input
—
XLINK_x_N/
XLINK_x_P
Link serial transmit data
Differential serial transmit data output
pads.
Output
—
Internal Signals
rx_clock
High speed transceiver
clock
Internal, differential high-speed clock
used to transmit and receive link data.
Input
—
repeat_data
Received repeat data
Repeater mode, received data to
retransmit.
Input
—
loop_back_data
Loop back data
Differential loop back transmit data.
Output
—
Table 2-1. MC92600 Transmitter Interface Signals (continued)
Signal Name
Description
Function
Direction
Active
State
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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