參數(shù)資料
型號(hào)： DS21Q58L
廠(chǎng)商： Maxim Integrated Products
文件頁(yè)數(shù)： 35/74頁(yè)
文件大?。?/td> 0K
描述： IC TXRX E1 QUAD 3.3V 100-LQFP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
產(chǎn)品變化通告： Product Discontinuation 20/Feb/2012
標(biāo)準(zhǔn)包裝： 90
功能： 收發(fā)器
接口： E1
電路數(shù)： 4
電源電壓： 3.14 V ~ 3.47 V
電流 - 電源： 230mA
工作溫度： 0°C ~ 70°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 100-LQFP
供應(yīng)商設(shè)備封裝： 100-LQFP（14x14）
包裝： 托盤(pán)
包括： AIS 警報(bào)檢測(cè)器和發(fā)生器，回送功能，PRBS 發(fā)生器 / 檢測(cè)器，遠(yuǎn)程檢測(cè)器和發(fā)生器
DS21Q58 E1 Quad Transceiver
40 of 74
14.
SYSTEM CLOCK INTERFACE
A single system clock interface (SCI) is common to all four DS21Q58 transceivers. The SCI is designed to allow
any one of the four receivers to act as the master reference clock for the system. When multiple DS21Q58s are
used to build an N port system, the SCI allows any one of the N ports to be the master. The selected reference is
then distributed to the other DS21Q58s through the REFCLK pin. The REFCLK pin acts as an output on the
DS21Q58, which has been selected to provide the reference clock from one of its four receivers. On DS21Q58s not
selected to source the reference clock, this pin becomes an input by writing 0s to the SCSx bits. The reference
clock is also passed to the clock synthesizer PLL to generate a 2.048MHz, 4.096MHz, 8.192MHz, or 16.384MHz
clock. This clock can then be used with the IBO function to merge up to eight E1 lines onto a single high-speed
PCM bus. In the event that the master E1 port fails (enters a receive carrier loss condition), that port automatically
switches to the clock present on the MCLK pin. Therefore, MCLK acts as the backup source of master clock. The
host can then find and select a functioning E1 port as the master. Because the selected port’s clock is passed to
the other DS21Q58s in a multiple device configuration, one DS21Q58’s synthesizer can always be the source of
the high-speed clock. This allows smooth transitions when clock-source switching occurs. The SCI control register
exists in Transceiver 1 only (TS0, TS1 = 0).
Register Name:
SCICR
Register Description:
System Clock Interface Control Register
(Note: This register is valid only for Transceiver 1 (TS0 = 0, TS1 = 0).)
Register Address:
1D Hex
Bit #
7
6
5
4
3
2
1
0
Name
AJACKE
BUCS
SOE
CSS1
CSS0
SCS2
SCS1
SCS0
NAME
BIT
FUNCTION
AJACKE
7
AJACK Enable. This bit enables the alternate jitter attenuator.
BUCS
6
Backup Clock Select. Selects which clock source to switch to
automatically during a loss-of-transmit clock event.
0 = during an LOTC event switch to MCLK
1 = during an LOTC event switch to system reference clock
SOE
5
Synthesizer Output Enable
0 = 2/4/8/16MCK pin in high-Z mode
1 = 2/4/8/16MCK pin active
CSS1
4
Clock Synthesizer Select Bit 1 (Table 14-1)
CSS0
3
Clock Synthesizer Select Bit 0 (Table 14-1)
SCS2
2
System Clock Select Bit 2 (Table 14-2)
SCS1
1
System Clock Select Bit 1 (Table 14-2)
SCS0
0
System Clock Select Bit 0 (Table 14-2)
Table 14-1. Synthesizer Output Select
CSS1
CSS0
SYNTHESIZER OUTPUT
FREQUENCY (MHz)
0
2.048
0
1
4.096
1
0
8.192
1
16.384
Table 14-2. System Clock Selection
SCS2
SCS1
SCS0
PORT SELECTED AS MASTER
0
None (Master Port can be derived from another DS21Q58 in the system.)
0
1
Transceiver 1
0
1
0
Transceiver 2
0
1
Transceiver 3
1
0
Transceiver 4
1
0
1
Reserved for future use.
1
0
Reserved for future use.
1
Reserved for future use.
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