Samsung OFFICESERV 7100 Service Manual page 73

2.5.11.2 Main Features
The Main Features of the 16DLI board are as follows:
QDMC (STI9511)
The QDMC(STI9511) is a special ASIC for controlling TP3404, which is the Quad Digital
Adapter for Subscriber Loops(QDASL) chip of National Semiconductor. The TP3404 is
made in the following procedures: The transceiver in a single channel Time Compression
Multiplexed(TCM) transmission method is expanded to 4 ports and micro wired control
and other control structures are changed.
The functional features of the QDMC are as follows:
Transfers/receives data in a UART format for D channels.
A UART speed(2/4/8/16 kbps) can be selected.
The B channel functions as a by-pass interface.
Inter-works with micro wired serial control(16-bit).
Controls two TP3404 chips.(A total of 16 channels are available.)
Recognizes the used board and ID.
Master clock of 4.096 MHz
Operates at 5 V
60 QFP
QDASL Interface
This interface is a D channel of each port, and RxD and TxD exist for serial data transfer.
AMI codes created along with B channels are transmitted to the line and the D-channel data
are used for controlling phones. The B-channel data are used for generating voice signals.
/INTD processes the micro-channel interrupt of QDASL in each port. The INT of the
QDASL is generated only when accessing the micro channel and initializing the QDASL.
The INT is generated in the event of NO SIGNAL(CO), OUT OF SYNC(C1), and BIPOLAR
VIOLATION(C7).
The INT is bundled up of UART Tx INT and AND GATE only when power is on for the
first time and the QDASL status is changed by an error in the phone. The INT is a clock in
the μ-CH controlling part that sets the initial QDASL status of the port and is configured
with CCLK(1 MHz), CI for entering controlling data, and CO for displaying status.
Also, B channel is synchronized into hardware frame allocated to itself and is transmitted
to the QDASL by opening the hardware buffer. The control data are transferred to the sub-
time slot, which is D-channel where 256 channels of 2-bit are allocated. The sub-time slot
means that the B channel of 8-bit is divided into four. To receive D channel data of 1 byte
from the QDASL, the data of 4 frames should be received first.
© SAMSUNG Electronics Co., Ltd.
OfficeServ 7100 Service Manual
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