參數(shù)資料
型號(hào): XRT4500
廠商: Exar Corporation
英文描述: MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
中文描述: 多協(xié)議串行網(wǎng)絡(luò)接口芯片
文件頁數(shù): 62/99頁
文件大小: 1384K
代理商: XRT4500
á
XRT4500
MULTIPROTOCOL SERIAL NETWORK INTERFACE IC
REV. 1.0.7
59
A system design similar to that presented below in
Figure 32, will accomplish the exact same function/re-
lationship between another Multi-protocol Transceiver
IC and the SCC/Microprocessor.
1.3.9
The XRT4500 includes an “Internal Oscillator” that
can be used to support “DTE Stand-Alone Testing/
Diagnostics” operations.
The user can enable the “Internal Oscillator” feature
(within the XRT4500) by pulling the “OSC_EN” input
pin (pin 53) “l(fā)ow”. Conversely, the user can disable
The Internal Oscillator
the “Internal Oscillator” feature by pulling the
“OSC_EN” input pin “high”.
If the user enables this feature, then the XRT4500 will
synthesize a clock signal (of frequencies ranging from
32kHz to 64kHz). Further, this clock signal will be out-
put via the “RX2D” and the “RX3D” output pins. Fig-
ure 1.20 presents an illustration of the XRT4500
(while interfaced to the DTE SCC) when the Internal
Oscillator is enabled.
F
IGURE
32. A
N
I
LLUSTRATION
OF
THE
N
ECESSARY
G
LUE
L
OGIC
REQUIRED
TO
DESIGN
A
FEATURE
SIMILAR
TO
THAT
OFFERED
BY
THE
“R
EGISTERED
” M
ODE
,
WHEN
USING
A
DIFFERENT
M
ULTI
-
PROTOCOL
S
ERIAL
N
ETWORK
I
NTERFACE
IC
μC/μP
Serial
Network
Interface Device
DTR_Signal
DSR_Signal
RL_Signal
RI_Signal
D-Flip-Flops
Clock
Q
Q
Q
Q
CLK
CLK
CLK
CLK
Clock Source
DTE Mode
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