參數(shù)資料
型號(hào)： XRT75R12
廠商： Exar Corporation
英文描述： TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
中文描述： 第十二章通道E3/DS3/STS-1線路接口單元與抖動(dòng)衰減器
文件頁(yè)數(shù)： 49/89頁(yè)
文件大?。?/td> 457K
代理商： XRT75R12
PRELIMINARY
XRT75R12
REV. P1.0.2
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
46
7.1
The LIU may be configured into different operating modes and have its performance monitored by software
through a standard microprocessor using data, address and control signals. These interface signals are de-
scribed below in Table 13. The microprocessor interface can be configured to operate in Asynchronous mode
or Synchronous mode.
T
HE
M
ICROPROCESSOR
I
NTERFACE
B
LOCK
S
IGNALS
T
ABLE
13: XRT75R12 M
ICROPROCESSOR
I
NTERFACE
S
IGNALS
P
IN
N
AME
T
YPE
D
ESCRIPTION
Pmode
I
Microprocessor Interface Mode Select Input pin
This pin is used to specify the microprocessor interface mode.
D[7:0]
I/O
Bi-Directional Data Bus for register "Read" or "Write" Operations.
Addr[7:0]
I
Eight-Bit Address Bus Inputs
The XRT75R12 LIU microprocessor interface uses a direct address bus. This address bus is
provided to permit the user to select an on-chip register for Read/Write access.
CS
I
Chip Select Input
This active low signal selects the microprocessor interface of the XRT75R12 LIU and enables
Read/Write operations with the on-chip register locations.
RD
I
Read Signal
This active low input functions as the read signal from the local
μ
P. When this
pin is pulled “Low” (if CS is “Low”) the LIU is informed that a read operation has been
requested and begins the process of the read cycle.
WR
I
Write Signal
This active low input functions as the write signal from the local
μ
P. When this
pin is pulled “Low” (if CS is “Low”) the LIU is informed that a write operation has been
requested and begins the process of the write cycle.
RDY
O
Ready Output
This active low signal is provided by the LIU device. It indicates that the cur-
rent read or write cycle is complete, and the LIU is waiting for the next command.
INT
O
Interrupt Output
This active low signal is provided by the LIU to alert the local mP that a
change in alarm status has occured. This pin is Reset Upon Read (RUR) once the alarm sta-
tus registers have been cleared.
RESET
I
Reset Input
This active low input pin is used to Reset the LIU.
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