DS33R41 Maxim Integrated Products, DS33R41 Datasheet - Page 82
DS33R41
Manufacturer Part Number
DS33R41
Description
Network Controller & Processor ICs Inverse-Multiplexing Ethernet Mapper wit
Manufacturer
Maxim Integrated Products
Datasheet
1.DS33R41.pdf
(335 pages)
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Figure 10-4. Simplified Diagram of Transmit Signaling Path
10.9.3 Processor-Based Transmit Signaling
In processor-based mode, signaling data is loaded into the transmit signaling registers (TS1–TS16) by 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 employ the transmit multiframe interrupt in
status register 4 (TR.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 are inserted into the outgoing stream, if enabled to do so through TR.T1TCR1.4 (T1 mode) or
TR.E1TCR1.6 (E1 mode). In T1 mode, only TS1–TS12 are used.
Signaling data can be sourced from the TR.TS registers on a per-channel basis by using the software signaling
insertion enable registers, TR.SSIE1–TRSSIE4.
10.9.3.1 T1 Mode
In T1 ESF framing mode, there are four signaling bits per channel (A, B, C, and D). TS1–TS12 contain a full
multiframe of signaling data. In T1 D4 framing mode, there are only two signaling bits per channel (A and B). In T1
D4 framing mode, the framer uses the C and D bit positions as the A and B bit positions for the next multiframe. In
D4 mode, two multiframes of signaling data can be loaded into TS1–TS12. The framer loads the contents of TS1–
TS12 into the outgoing shift register every other D4 multiframe. In D4 mode, the host should load new contents into
TS1–TS12 on every other multiframe boundary and no later than 120μs after the boundary. In T1 mode, only
registers TR.SSIE1–TR.SSIE3 are used since there are only 24 channels in a T1 frame.
T1/E1 DATA
STREAM
ONLY APPLIES TO T1 MODE
0
1
B7
PER-CHANNEL
TR.SSIE1 -
TR.SSIE4
CONTROL
TR.T1TCR1.4
1
0
82 of 335
REGISTERS
SIGNALING
TRANSMIT
PER-CHANNEL
TR.PCPR.3
CONTROL
0
1
SIGNALING
BUFFERS
TSERI
TSIG
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