Advance Data Sheet, Rev. 2
April 1999
TLIU04C1 Quad T1/E1 Line Interface
11
Lucent Technologies Inc.
Microprocessor Mode
(continued)
Pin Information
(continued)
Table 1. Pin Descriptions
(continued)
* I = input, O = output, I
u
indicates an input with internal pull-up; I
d
indicates an input with internal pull-down, P = power. Resistance value of all
internal pull-ups or pull-downs is 50 k
, unless otherwise specified.
Pin
Symbol
Type
*
Name/Description
138, 19,
66, 91
RPD/RDATA
[1—4]
O
Receive Positive Data.
When in dual-rail (DUAL = 1: register 5, bit 4) clock
recovery mode (CDR = 1: register 5, bit 0), this signal is the received positive
NRZ data to the terminal equipment. When in data slicing mode (CDR = 0),
this signal is the raw sliced positive data of the front end.
Receive Data.
When in single-rail (DUAL = 0: register 5, bit 4) clock recovery
mode (CDR = 1: register 5, bit 0), this signal is the received NRZ data.
Receive Clock.
In clock recovery mode (CDR = 1: register 5, bit 0), this
signal is the recovered receive clock for the terminal equipment. The duty
cycle of RCLK is 50% ± 5%.
Analog Loss of Signal.
In data slicing mode (CDR = 0: register 5, bit 0), this
signal is asserted high to indicate low amplitude receive data at the RTIP/
RRING inputs.
Transmit Negative Data.
This signal is the transmit negative NRZ data from
the terminal equipment.
Transmit Positive Data.
When in dual-rail mode (DUAL = 1: register 5, bit 4),
this signal is the transmit positive NRZ data from the terminal equipment.
Transmit Data.
When in single-rail mode (DUAL = 0: register 5, bit 4), this
signal is the transmit NRZ data from the terminal equipment.
Transmit Clock.
DS1 (1.544 MHz ± 32 ppm) or CEPT (2.048 MHz ±
50 ppm) clock signal from the terminal equipment.
Microprocessor Mode.
When MPMODE = 1, the device uses the address
latch enable type microprocessor read/write protocol with separate read and
write controls. Setting MPMODE = 0 allows the device to use the address
strobe type microprocessor read/write protocol with a separate data strobe
and a combined read/write control.
Microprocessor Multiplex Mode.
Setting MPMUX = 1 allows the
microprocessor interface to accept multiplexed address and data signals.
Setting MPMUX = 0 allows the microprocessor interface to accept
demultiplexed (separate) address and data signals.
Write (Active-Low).
If MPMODE = 1 (pin 110), this pin is asserted low by the
microprocessor to initiate a write cycle.
Data Strobe (Active-Low).
If MPMODE = 0 (pin 21), this pin becomes the
data strobe for the microprocessor. When R/W = 0 (pin 111) initiating a write,
a low applied to this pin latches the signal on the data bus into internal
registers.
Read (Active-Low).
If MPMODE = 1 (pin 110), this pin is asserted low by the
microprocessor to initiate a read cycle.
Read/Write.
If MPMODE = 0 (pin 110), this pin is asserted high by the
microprocessor to initiate a read cycle or asserted low to initiate a write
cycle.
139, 18,
67, 90
RCLK/ALOS
[1—4]
O
140, 17,
68, 89
141, 16,
69, 88
TND[1—4]
I
TPD/TDATA
[1—4]
I
142, 15,
70, 87
110
TCLK[1—4]
I
MPMODE
I
108
MPMUX
I
107
WR_DS
I
111
RD_R/W
I