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XRT7250 데이터시트(PDF) 23 Page - Exar Corporation

부품명 XRT7250
상세설명  DS3/E3 FRAMER IC
PDF  463 Pages
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제조업체  EXAR [Exar Corporation]
홈페이지  http://www.exar.com
Logo EXAR - Exar Corporation

XRT7250 데이터시트(HTML) 23 Page - Exar Corporation

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XRT7250
DS3/E3 FRAMER IC
áç
áç
áç
áç
REV. 1.1.1
4
10
RD_DS
I
Read Data Strobe (Intel Mode)
If the microprocessor interface is operating in the Intel Mode, then this input will
function as the RD (READ STROBE) input signal from the local µP. Once this
active-low signal is asserted, then the Framer will place the contents of the
addressed registers (within the Framer) on the Microprocessor Data Bus
(D[7:0]). When this signal is negated, the Data Bus will be tri-stated.
Data Strobe (Motorola Mode):
If the microprocessor interface is operating in the Motorola mode, then this pin
will function as the active-low Data Strobe signal.
11
NC
Not Bonded Out
12
NC
Not Bonded Out
13
INT
O
Interrupt Request Output:
This open-drain, active-low output signal will be asserted when the Framer
device is requesting interrupt service from the local microprocessor. This out-
put pin should typically be connected to the "Interrupt Request" input of the
local microprocessor.
14
GND
Ground Pin
15
A0
I
Address Bus Input (Microprocessor Interface) - LSB (Least Signif-
icant Bit)
(Please see description for A8)
16
A1
I
Address Bus Input (Microprocessor Interface):
(Please see description for A8)
17
A2
I
Address Bus Input (Microprocessor Interface):
(Please see description for A8)
18
A3
I
Address Bus Input (Microprocessor Interface):
(Please see description for A8)
19
A4
I
Address Bus Input (Microprocessor Interface):
(Please see description for A8)
20
A5
I
Address Bus Input (Microprocessor Interface):
(Please see description for A8)
21
A6
I
Address Bus Input (Microprocessor Interface):
(Please see description for A8)
22
A7
I
Address Bus Input (Microprocessor Interface):
(Please see description for A8)
23
A8
I
Address Bus Input (Microprocessor Interface) - MSB (Most Signif-
icant Bit):
This input pin, along with inputs A0 - A7 are used to select the on-chip Framer
register and RAM space for READ/WRITE operations with the "local" micropro-
cessor.
24
VDD
****
Power Supply Pin
PIN DESCRIPTION
PIN #NAME
TYPE
DESCRIPTION



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