XRT94L31IB-L Exar Corporation, XRT94L31IB-L Datasheet - Page 88

• Manufacturer Part Number: XRT94L31IB-L
• Description: IC MAPPER DS3/E3/STS-1 504TBGA
• Manufacturer: Exar Corporation

Specifications of XRT94L31IB-L

• Applications: Network Switches
• Interface: Bus
• Voltage - Supply: 3.14 V ~ 3.47 V
• Package / Case: 504-LBGA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XRT94L31
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC
PIN DESCRIPTION OF THE XRT94L31 (REV. B)
PIN #
AC27
AB26
AC26
AA25
W25
W24
V23
Y25
E7
D5
SIGNAL NAME
REFCLK34
REFCLK51
GPI0_0
GPI0_1
GPI0_2
GPI0_3
GPI0_4
GPI0_5
GPI0_6
GPI0_7
I/O
I/O
I
I
TTL/
CMOS
TTL
TTL
TYPE
General Purpose Input/Output pin:
N
This input pin can be configured to function as either an input or output
pin by writing the appropriate value into Bit x (GPIO_DIR_x), within the
Operation General Purpose Input/Output Direction Register - 0 (Address
Location = 0x014B).
If this pin is configured to be an input pin the state of this pin can be mon-
itored by reading the state of Bit x (GPIO_x) within the Operation Gen-
eral Purpose Input/Output Register - Byte 0 (Address Location =
0x0147).
If this pin is configured to be an output pin the state of this pin can be
controlled by writing the appropriate value into Bit x (GPIO_x) within the
Operation General Purpose Input/Output Register - Byte 0 (Address
Location = 0x0147).
E3 Reference Clock Input for the Jitter Attenuator within the DS3/E3
Mapper Block:
To operate any of the channels (within the XRT94L31) in the E3 Mode,
apply a clock signal with a frequency of 34.368±20ppm to this input pin.
This input pin functions as the timing reference for the DS3/E3/STS-1 Jit-
ter Attenuator (within the DS3/E3 Mapper block) for E3 applications.
For E3 Applications, the DS3/E3 Framer block will use this input clock
signal, as a timing source in order to transmit the E3 AIS pattern, in the
Egress Direction (e.g., from the XRT94L31 to the DS3/E3/STS-1 LIU
IC).
N
STS-1 Reference Clock Input for the Jitter Attenuator within the
DS3/E3 Mapper Block.
To operate any of the channels (within the XRT94L31) in the STS-1/
STM-0 Mode, apply a clock signal with a frequency of 51.84MHz±20ppm
to this input pin. This input pin functions as the timing reference for the
DS3/E3/STS-1 Jitter Attenuator (within the DS3/E3 Mapper block) for
STS-1 applications.
N
OTE
OTE
OTES
CLOCK INPUTS
1. If the XRT94L31 is to be operated in the SFM Mode, apply a
2. If the user does not intend to operate any of the channels in the
: x = 0:7
: Connect this pin to GND if none of the channels of the XRT94L31
:
are to be operated in the E3 or if the XRT94L31 is to be
operated in the SFM mode.
12.288MHz±20ppm clock signal to this input pin.
STS-1/STM-0 Mode, connect this input pin to GND.
88
DESCRIPTION
REV. 1.0.1