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XRT94L31IB Datasheet(PDF) 3 Page - Exar Corporation

Part # XRT94L31IB
Description  3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT94L31IB Datasheet(HTML) 3 Page - Exar Corporation

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XRT94L31
3
REV. 1.0.1
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC
PIN DESCRIPTION OF THE XRT94L31 (REV. B)
PIN #
SIGNAL NAME
I/O
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 Modes (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 mPCLK
frequencies ranging up to 33MHz.
2. This pin is inactive if the Microprocessor Interface has been
configured to operate in either the Intel-Asynchronous or the
Motorola-Asynchronousl Modes. In this case, tie this pin to
GND.
AD25
AD23
AC21
PTYPE_0PTYPE_1P
TYPE_2
I
TTL
Microprocessor Type Select input:
These three input pins are used to configure the Microprocessor Inter-
face block to readily support a wide variety of Microprocessor Interfaces.
The relationship between the settings of these input pins and the corre-
sponding 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
AD27
AB25
W23
Y24
AD26
AC25
AA24
Y23
AE24
AB20
AD22
AC20
AD21
AE23
AF24
PADDR_0
PADDR_1
PADDR_2
PADDR_3
PADDR_4
PADDR_5
PADDR_6
PADDR_7
PADDR_8
PADDR_9
PADDR_10
PADDR_11
PADDR_12
PADDR_13
PADDR_14
I
TTL
Address Bus Input pins (Microprocessor Interface):
These pins permit the Microprocessor to identify on-chip registers and
Buffer/Memory locations (within the XRT94L31) whenever it performs
READ and WRITE operations with the XRT94L31.


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