T1/E1 Short Haul Transceiver with Crystal-less Jitter Attenuation — LXT351
Table 3. LXT351 Signal Descriptions (Continued)
Pin #
PLCC
Symbol
I/O1
Description
QFP
Read. On an Intel bus, driving RD Low commands a LXT351 register read
operation.
9
7
RD / DS
DI
Data Strobe. On a Motorola bus, DS goes Low when data is being driven
on the address/data bus. Data is valid on the rising edge of DS.
Address/Data Bus 6 and 7. Used with AD0 - AD5 to form the address/
DI/O data bus. Conforms to Intel and Motorola multiplexed address/data bus
specifications.
10
11
9
AD6
AD7
10
Write. On an Intel bus, driving WR Low commands a LXT351 register write
operation.
12
13
WR / R/W
DI
Read/Write. On a Motorola bus, driving R/W High commands a LXT351
register read operation; driving it Low commands a write operation.
Transmit Tip and Ring. Differential driver output pair designed to drive a
50 - 200 Ω load. The transformer and line matching resistors should be
selected to give the desired pulse height and return loss performance. See
“Application Information” on page 29.
13
16
15
19
TTIP
AO
TRING
14
15
16
18
TGND
TVCC
-
-
Ground return for the transmit driver power supply TVCC.
+5 VDC Power Supply for the transmit drivers. TVCC must not vary from
VCC by more than ± 0.3 V.
Chip Select. During a read or write operation, CS must remain Low. See
Figure 16 and Figure 17 for timing requirements.
17
18
20
21
CS
DI
In the case of a single processor controlling several chips, this line is used
to select a specific transceiver.
Interrupt. INT goes Low to flag the host when LOS, AIS, QRSS, DFMS or
DFMO bits changes state, or when an elastic store overflow or underflow
occurs. To identify the specific interrupt, read the Performance Status
Register (PSR). To clear or mask an interrupt, write a one to the
appropriate bit in the Interrupt Clear Register (ICR). To re-enable the
interrupt, write a zero. INT is an open drain output that must be
connected to VCC through a pull-up resistor.
INT
DO
Receive Tip and Ring. The Alternate Mark Inversion (AMI) signal received
from the line is applied at these pins. A 1:1 transformer is required. Data
and clock recovered from RTIP/RRING are output on the RPOS/RNEG (or
RDATA in Unipolar mode), and RCLK pins.
19
20
24
25
RTIP
AI
-
RRING
+5 VDC Power Supply for all circuits except the transmit drivers. Transmit
drivers are supplied by TVCC.
21
27
VCC
1. DI = Digital Input; DO = Digital Output; DI/O = Digital Input/Output; AI = Analog Input; AO = Analog Output.
Datasheet
11
INTEL [ INTEL ]
