參數(shù)資料
型號: XRT83VSH28IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA225
封裝: 19 X 19 MM, 1 MM PITCH, PLASTIC, BGA-225
文件頁數(shù): 42/74頁
文件大小: 574K
代理商: XRT83VSH28IB
XRT83VSH28
PRELIMINARY
39
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
REV. P1.0.0
5.0
MICROPROCESSOR INTERFACE
The microprocessor interface can be accessed through a standard serial interface (BGA Package Only) or a
standard parallel microprocessor interface. The SER_PAR pin is used to select between the two. By default,
the chip is configured in the Parallel Microprocessor interace. For Serial communication, this pin must be
pulled “High”.
5.1
Serial Microprocessor Interface Block (BGA Package Only)
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 29
.
5.1.1
Serial Timing Information
The serial port requires 24 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 24
bits of serial data have been sampled. A timing diagram of the Serial Microprocessor is shown in
Figure 30
.
N
OTE
:
For applications without a free running SCLK, a minimum of 1 SCLK pulse must be applied when CS is “High”,
befrore pulling CS “Low”.
F
IGURE
29. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
S
ERIAL
M
ICROPROCESSOR
I
NTERFACE
F
IGURE
30. T
IMING
D
IAGRAM
FOR
THE
S
ERIAL
M
ICROPROCESSOR
I
NTERFACE
Serial
Microprocessor
Interface
CS
SDI
SCLK
SDO
INT
RESET
HW/Host
SER_PAR
R/W
ADDR[0] - ADDR[7]
Don't Care
DATA[0] - DATA[7]
CS
SDI
SCLK
8-Bit Address
8-Bit Data
7-Bit Don't Care
1=Read
0=Write
SDO
DATA[0] - DATA[7]
Readback
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