參數(shù)資料
型號: XRT82L24IV
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: QUAD E1 LINE TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
中文描述: DATACOM, PCM TRANSCEIVER, PQFP100
封裝: 14 X 14 MM, 1.40 MM HEIGHT, TQFP-100
文件頁數(shù): 8/43頁
文件大?。?/td> 285K
代理商: XRT82L24IV
XRT82L24
QUAD E1 LINE TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.2.3
á
6
8
PTS2
SR/DR
I
Host Mode:
Processor Type Select Input bit 2:
See description for pin 7.
Hardware Mode
Single rail/Dual Rail Control
Connect this pin “Low” to select transmit and receive data format in dual-rail
mode. In this mode, HDB3 encoder and decoder are not available. Connect this
pin "High" to select single-rail data format.
N
OTE
:
Internally pulled -downwith a 50k
resistor.
9
HW/HOST
I
Mode Control Input:
This pin is used to select the operating mode of the device, (Hardware Mode or
Host Mode.)
In
Hardware Mode
, the parallel Microprocessor interface is disabled and
enables all hardware control pin functions.
In
Host Mode
, the parallel microprocessor interface pins are used for control
functions.
N
OTE
:
Internally pulled "High" with 50k
.
10
PCLK
Codes
I
I
Processor Clock Input
.
Input clock for synchronous microprocessor operation. Maximum clock rate is
16 MHz. This pin is internally pull-up for asynchronous microprocessor interface
when no clock is present.
Coding/Decoding Select
.
In Hardware Mode
, if single-rail data format is selected (pin 8 =”1”), connect
this pin "High" to select AMI encoding and decoding. Connect this pin Low to
select HDB3.
14
WR_R/W
I
Write Input (Read/Write)
.
With Intel bus timing, a Low pulse on WR selects a write operation when CS pin
is Low. When configured in Motorola bus timing, a "High" pulse on R/W selects
a read operation and a Low pulse on R/W selects a write operation when CS is
Low.
15
RD_DS
I
Read Input (Data Strobe).
With Intel bus timing, a Low pulse on RD selects a read operation when CS pin
is Low. When configured in Motorola bus timing, a Low pulse on DS indicates a
read or write operation when CS pin is Low.
16
ALE_AS
I
Address Latch Input (Address Strobe)
.
With Intel bus timing, the address inputs are latched into the internal register on
the falling edge of ALE. When configured in Motorola bus timing, the address
inputs are latched into the internal register on the falling edge of AS.
17
CS
I
Chip Select Input
.
This signal must be Low in order to access the parallel port.
PIN DESCRIPTIONS
P
IN
#
N
AME
T
YPE
D
ESCRIPTION
Pin 9
Operating Mode
“Low”
Host Mode
“High”
Hardware Mode
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