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XRT83SH38
8
REV. 1.0.7
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
TRANSMIT SECTION
SIGNAL NAME
BGA
LEAD #
TYPE
DESCRIPTION
TCLKE/PTS2
L15
I
Transmit Clock Edge
Hardware Mode
This pin is used to select which edge of the transmit clock is used to sample data
on the transmitter on the TPOS/TNEG inputs. By default, data is sampled on the
falling edge. To sample data on the rising edge, this pin must be pulled "High".
Host Mode
PTS[2:1] pins are used to select the type of microprocessor to be used for Host
communication.
"00" = 8051 Intel Asynchronous
"01" = 68K Motorola Asynchronous
"10" = x86 Intel Synchronous
"11" = 860 Motorola Synchronous
NOTE: This pin is internally pulled “Low” with a 50k
resistor.
TTIP0
TTIP1
TTIP2
TTIP3
TTIP4
TTIP5
TTIP6
TTIP7
E3
G4
F17
C16
R2
N2
N16
P16
O
Transmit Differential Tip Output
TTIP is the positive differential output to the line interface. Along with the TRING
signal, these pins should be coupled to a 1:2 step up transformer for proper opera-
tion.
TRING0
TRING1
TRING2
TRING3
TRING4
TRING5
TRING6
TRING7
E2
F3
F15
E16
P2
N4
R15
P17
O
Transmit Differential Ring Output
TRING is the negative differential output to the line interface. Along with the TTIP
signal, these pins should be coupled to a 1:2 step up transformer for proper opera-
tion.
TPOS0
TPOS1
TPOS2
TPOS3
TPOS4
TPOS5
TPOS6
TPOS7
C5
A4
B14
D14
V4
U5
V15
T14
I
TPOS/TDATA Input
Transmit digital input pin. In dual rail mode, this pin is the transmit positive data
input. In single rail mode, this pin is the transmit non-return to zero (NRZ) data
input.
NOTE: Internally pulled "Low" with a 50K
resistor.
TNEG0
TNEG1
TNEG2
TNEG3
TNEG4
TNEG5
TNEG6
TNEG7
C4
B5
D13
B15
U4
V5
U14
R14
I
Transmitter Negative NRZ Data Input
In dual rail mode, this signal is the negative-rail input data for the transmitter. In
single rail mode, this pin can be left unconnected while in Host mode. However, in
Hardware mode, this pin is used to select the type of encoding/decoding for the E1/
T1 data format. Connecting this pin “Low” enables HDB3 in E1 or B8ZS in T1.
Connecting this pin “High” selects AMI data format.
NOTE: Internally pulled “Low” with a 50k
resistor.