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XRT94L33 Datasheet(PDF) 3 Page - Exar Corporation

Part # XRT94L33
Description  3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT94L33 Datasheet(HTML) 3 Page - Exar Corporation

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XRT94L33
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
Rev.1.2.0.
3
PIN DESCRIPTION of the XRT94L33 (Rev. B)
PIN #
SIGNAL NAME
I/O
SIGNAL
TYPE
DESCRIPTION
MICROPROCESSOR INTERFACE
Y22
PCLK
I
TTL
Microprocessor Interface Clock Input:
This clock input signal is only used if the Microprocessor
Interface has been configured to operate in one of the
Synchronous Mode (e.g., Power PC 403 Mode).
If the
Microprocessor Interface is configured to operate in one of these
modes, then it will use this clock signal to do the following.
• To sample the CS*, WR*/R/W*, A[14:0], D[7:0], RD*/DS* and
DBEN input pins, and
• To update the state of D[7:0] and the RDY/DTACK output
signals.
NOTES:
1.
The Microprocessor Interface can work with
µPCLK
frequencies ranging up to 33MHz.
2.
This pin is inactive if the user has configured the
Microprocessor Interface to operate in either the Intel-
Asynchronous or the Motorola-Asynchronousl Modes.
In this case, the user should tie this pin to GND.
AD25
AD23
AC21
PTYPE_0
PTYPE_1
PTYPE_2
I
TTL
Microprocessor Type Select input:
These three input pins permit the user to configure the
Microprocessor Interface block to readily support a wide variety
of Microprocessor Interfaces.
The relationship between the
settings
of
these
input
pins
and
the
corresponding
Microprocessor Interface configuration is presented below.
PTYPE[2:0]
Microprocessor Interface Mode
000
Intel-Asynchronous Mode
001
Motorola – Asynchronous Mode
010
Intel X86
011
Intel I960
100
IDT3051/52 (MIPS)
101
Power PC 403 Mode
111
Motorola 860


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