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| 型號： | XRT73R12IB |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 44/89頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU E3/DS3/STS-1 12CH 420TBGA |
| 標(biāo)準(zhǔn)包裝： | 40 |
| 類型： | 線路接口裝置（LIU） |
| 驅(qū)動器/接收器數(shù)： | 12/12 |
| 規(guī)程： | DS3，E3，STS-1 |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 420-LBGA 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 420-TBGA（35x35） |
| 包裝： | 托盤 |
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XRT73R12
46
REV. 1.0.3
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
7.1
THE MICROPROCESSOR INTERFACE BLOCK SIGNALS
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 14. The microprocessor interface can be configured to operate in Asynchronous mode
or Synchronous mode.
TABLE 14: XRT73R12 MICROPROCESSOR INTERFACE SIGNALS
PIN NAME
TYPE
DESCRIPTION
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 XRT73R12 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 XRT73R12 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
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
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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