XRT86VX38_0906 Datasheet, PDF (28/53 Pages) Exar Corporation – OCTAL T1/E1/J1 FRAMER/LIU COMBO - HARDWARE DESCRIPTION

XRT86VX38
OCTAL T1/E1/J1 FRAMER/LIU COMBO - HARDWARE DESCRIPTION
TRANSMIT LINE INTERFACE
REV. 1.0.1
SIGNAL NAME
329 PKG 256 PKG
TYPE
BALL# BALL #
DESCRIPTION
TxON
W4
T4
I Transmitter On
This input pin permits the user to either enable or disable the Trans-
mit Output Driver within the Transmit DS1/E1 LIU Block. If the TxON
pin is pulled “Low”, all 8 Channels are tri-stated. When this pin is
pulled ‘High’, turning on or off the transmitters will be determined by
the appropriate channel registers (address 0x0Fn2, bit 3)
LOW = Disables the Transmit Output Driver within the Transmit DS1/
E1 LIU Block. In this setting, the TTIP and TRING output pins of all 8
channels will be tri-stated.
HIGH = Enables the Transmit Output Driver within the Transmit DS1/
E1 LIU Block. In this setting, the corresponding TTIP and TRING out-
put pins will be enabled or disabled by programming the appropriate
channel register. (address 0x0Fn2, bit 3)
NOTE: Whenever the transmitters are turned off, the TTIP and
TRING output pins will be tri-stated.
TIMING INTERFACE
SIGNAL NAME
MCLKIN
E1OSCCLK
329 PKG 256 PKG
BALL# BALL #
C8
E6
V5
R5
TYPE
I
O
OUTPUT
DRIVE (MA)
DESCRIPTION
-
Master Clock Input:
This pin is used to provide the timing reference for the inter-
nal master clock of the device. The frequency of this clock
is programmable from 8kHz to 16.384MHz in register
0x0FE9.
8
Framer E1 Output Clock Reference
This output pin is defaulted to 2.048MHz, but can be pro-
grammed to 65.536MHz in register 0x011E.
T1OSCCLK
W5
T5
O
8KEXTOSC
T5
L6
I
8
Framer T1 Output Clock Reference
This output pin is defaulted to 1.544MHz, but can be pro-
grammed to output 49.408MHz in register 0x011E.
-
External Oscillator Select
For normal operation, this pin should not be used, or pulled
“Low”.
This pin is internally pulled “Low” with a 50k resistor.
ANALOG
E5
B4
O
Factory Test Mode Pin
NOTE: For Internal Use Only
25