DS21455 Maxim Integrated Products, DS21455 Datasheet - Page 100

• Manufacturer Part Number: DS21455
• Description: Network Controller & Processor ICs Quad E1-T1-J1 Single -Chip Transceiver (S
• Manufacturer: Maxim Integrated Products

Specifications of DS21455

• Product: Framer
• Number Of Transceivers: 4
• Data Rate: 64 Kbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 328 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Package / Case: BGA

17.2 Transmit Signaling
Figure 17-2.Simplified Diagram of Transmit Signaling Path
17.2.1 Processor-Based Transmit Signaling
In processor-based mode, signaling data is loaded into the transmit-signaling registers (TS1–TS16) via
the host interface. On multiframe boundaries, the contents of these registers are loaded into a shift register
for placement in the appropriate bit position in the outgoing data stream. The user can utilize the transmit
multiframe interrupt in status register 4 (SR4.4) to know when to update the signaling bits. The user need
not update any transmit signaling register for which there is no change of state for that register.
Each transmit signaling register contains the robbed-bit signaling (T1) or TS16 CAS signaling (E1) for
two time slots that will be inserted into the outgoing stream if enabled to do so via T1TCR1.4 (T1 Mode)
or E1TCR1.6 (E1 Mode). In T1 mode, only TS1 through TS12 are used.
Signaling data can be sourced from the TS registers on a per-channel basis by utilizing the software-
signaling insertion-enable registers, SSIE1 through SSIE4.
T1/E1 DATA
STREAM
ONLY APPLIES TO T1 MODE
0
1
B7
PER-CHANNEL
SSIE1 - SSIE4
CONTROL
T1TCR1.4
1
0
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REGISTERS
SIGNALING
TRANSMIT
PER-CHANNEL
CONTROL
PCPR.3
0
1
SIGNALING
BUFFERS
TSER
TSIG