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XRT8001IP Datasheet(PDF) 38 Page - Exar Corporation

Part # XRT8001IP
Description  WAN Clock for T1 and E1 Systems
PDF  48 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT8001IP Datasheet(HTML) 38 Page - Exar Corporation

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XRT8001
38
Rev. 1.01
Optional
Optional
+ 5V
18
17
16
15
1
2
3
4
SDO
SYNC
FIN
Vcc
SDI
CSB
SCLK
GND
1.544 MHz
2.048 MHz
N.C.
5
6
7
8
9
GND
CKL1
V
CC
MSB
GND
LOCKDET
V
CC
CLK
2
GND
14
13
12
11
10
VCC
+ 5V
+ 5V
PLD
or
µµP
+ 5V
Serial Port Control
N.C.
Reset
Busy
VER_REQ
VER_PASS/FAIL
+5V
Clock and Data In
8/64 kHz out
Optional
Optional
+ 5V
18
17
16
15
1
2
3
4
SDO
SYNC
FIN
Vcc
SDI
CSB
SCLK
GND
1.544 MHz
2.048 MHz
N.C.
5
6
7
8
9
GND
CKL1
V
CC
MSB
GND
LOCKDET
V
CC
CLK
2
GND
14
13
12
11
10
VCC
+ 5V
+ 5V
PLD
or
µµP
+ 5V
Serial Port Control
N.C.
Reset
Busy
VER_REQ
VER_PASS/FAIL
+5V
Clock and Data In
8/64 kHz out
Figure 22. Typical Application Example: Generating 2.048MHz from 1.544MHz
Serial Port Programming in Four Steps
Step
Procedure
Result
1
Set the "MSB_OUT" output pin to "high"
Configures XRT8001 to operate in "Master" mode
2
Write the value "00101" into Command
Configures XRT8001 to accept an "N x 1.544MHz clock
Register CR0 (located at 0x00)
signal via the "FIN" input pin., and output a "K x 64kHz"
clock signal via the "CLK1" output pin. (For this
application N = 1 and K = 32). This step also enables
"PLL #1" within the XRT8001
3
Write the value "00000" into Command
Sets "N" (as in "N x 1.544MHz") to be "1"
Register CR1 (located at 0x01)
4
Write the value "11111" into Command
Sets "K" (as in "K x 64kHz") to be "32"
Register CR2 (located at 0x02)
5
Write the value "01000" into Command
Enables the output driver for CLK1
Register CR4 (located at 0x04)
8.0 Generating 2.048MHz from 1.55MHz



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