參數(shù)資料
型號: XRT83SL28
廠商: Exar Corporation
英文描述: 8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
中文描述: 8路E1短途線路接口單元
文件頁數(shù): 33/47頁
文件大?。?/td> 377K
代理商: XRT83SL28
xr
REV. 1.0.0
XRT83SL28
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
31
4.0
SERIAL MICROPROCESSOR INTERFACE BLOCK
The serial microprocessor uses a standard 3-pin serial port with CS, SCLK, and SDI for programming the LIU.
Optional pins such as SDO, INT, and RESET allow the ability to read back contents of the registers, monitor
the LIU via an interrupt pin, and reset the LIU to its default configuration by pulling reset "Low" for more than
10
μ
S. A simplified block diagram of the Serial Microprocessor is shown in Figure 26.
F
IGURE
26. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
S
ERIAL
M
ICROPROCESSOR
I
NTERFACE
4.1
The serial port requires 16 bits of data applied to the SDI (Serial Data Input) pin. The Serial Microprocessor
samples SDI on the rising edge of SCLK (Serial Clock Input). The data is not latched into the device until all 16
bits of serial data have been sampled. A timing diagram of the Serial Microprocessor is shown in Figure 27.
F
IGURE
27. T
IMING
D
IAGRAM
FOR
THE
S
ERIAL
M
ICROPROCESSOR
I
NTERFACE
Serial Timing Information
Serial
Microprocessor
Interface
CS
SDI
SCLK
SDO
RESET
INT
HW/Host
CS
SDI
SCLK
SDO
1
2
10
9
8
7
6
5
4
3
11
16
15
13
14
12
R/W
A0
A1
A2
A3
A4
A5
X
D0
D1
D7
D6
D5
D4
D3
D2
D0
D1
D7
D6
D5
D4
D3
D2
High-Z
High-Z
25nS
50nS
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