參數(shù)資料
型號(hào): XRT8001
廠商: Exar Corporation
英文描述: WAN Clock for T1 and E1 Systems
中文描述: 廣域網(wǎng)時(shí)鐘T1和E1系統(tǒng)
文件頁數(shù): 38/48頁
文件大?。?/td> 1054K
代理商: XRT8001
XRT8001
38
Rev. 1.01
Optional
Optional
+ 5V
18
17
16
15
1
2
3
4
SDO
8/64 kHz out
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
V
CC
+ 5V
+ 5V
or
m
P
+ 5V
Serial Port Control
N.C.
Reset
VER_REQ
VER_PASS/FAIL
+5V
Clock and Data In
SYNC
PLD
Busy
X
Figure 22. Typical Application Example: Generating 2.048MHz from 1.544MHz
Serial Port Programming in Four Steps
Step
1
Set the "MSB_OUT" output pin to "high"
2
Write the value "00101" into Command
Register CR0 (located at 0x00)
Procedure
Result
Configures XRT8001 to operate in "Master" mode
Configures XRT8001 to accept an "N x 1.544MHz clock
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
Sets "N" (as in "N x 1.544MHz") to be "1"
3
Write the value "00000" into Command
Register CR1 (located at 0x01)
Write the value "11111" into Command
Register CR2 (located at 0x02)
Write the value "01000" into Command
Register CR4 (located at 0x04)
4
Sets "K" (as in "K x 64kHz") to be "32"
5
Enables the output driver for CLK1
8.0 Generating 2.048MHz from 1.55MHz
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