ds2152 Maxim Integrated Products, Inc., ds2152 Datasheet - Page 48

• Manufacturer Part Number: ds2152
• Description: Ds2152 Enhanced T1 Single Chip Transceiver
• Manufacturer: Maxim Integrated Products, Inc.

A change in the signaling bits from one multiframe to the next will cause the RSC status bit (SR2.0) to be
set. The user can enable the INT pin to toggle low upon detection of a change in signaling by setting the
IMR2.0 bit. Once a signaling change has been detected, the user has at least 2.75ms to read the data out of
the RS1 to RS12 registers before the data will be lost.
TS1 TO TS12: TRANSMIT SIGNALING REGISTERS (Address = 70 to 7B Hex)
Each Transmit Signaling Register (TS1 to TS12) contains the robbed-bit signaling for eight DS0 channels
that will be inserted into the outgoing stream if enabled to do so via TCR1.4. In the ESF framing mode,
there can be up to four signaling bits per channel (A–D). On multiframe boundaries, the DS2152 will load
the values present in the Transmit Signaling Register into an outgoing signaling shift register that is
internal to the device. The user can utilize the Transmit Multiframe Interrupt in Status Register 2 (SR2.6)
to know when to update the signaling bits. In the ESF framing mode, the interrupt will come every 3 ms
and the user has a full 3ms to update the TSRs. In the D4 framing mode, there are only 2 signaling bits
per channel (A and B). However, in the D4 framing mode the DS2152 uses the C and D bit positions as
the A and B bit positions for the next multiframe. The DS2152 loads the values in the TSRs into the
outgoing shift register every other D4 multiframe.
A/C(16)
A/C(24)
B/D(16)
B/D(24)
(MSB)
A/C(8)
B/D(8)
A(16)
A(24)
B(16)
B(24)
A(8)
B(8)
SYMBOL
D(24)
A(1)
A/C(15)
A/C(23)
B/D(15)
B/D(23)
A/C(7)
B/D(7)
A(15)
A(23)
B(15)
B(23)
A(7)
B(7)
POSITION
A/C(14)
A/C(22)
B/D(14)
B/D(22)
A/C(6)
B/D(6)
A(14)
A(22)
B(14)
B(22)
TS12.7
A(6)
B(6)
TS1.0
A/C(13)
A/C(21)
B/D(13)
B/D(21)
A/C(5)
B/D(5)
A(13)
A(21)
B(13)
B(21)
A(5)
B(5)
NAME AND DESCRIPTION
Signaling Bit A in Channel 24
Signaling Bit D in Channel 1
A/C(12)
A/C(20)
B/D(12)
B/D(20)
A/C(4)
B/D(4)
48 of 97
A(12)
A(20)
B(12)
B(20)
A(4)
B(4)
A/C(11)
A/C(19)
B/D(11)
B/D(19)
A/C(3)
B/D(3)
A(11)
A(19)
B(11)
B(19)
A(3)
B(3)
A/C(10)
A/C(18)
B/D(10)
B/D(18)
A/C(2)
B/D(2)
A(10)
A(18)
B(10)
B(18)
A(2)
B(2)
A/C(17)
B/D(17)
A/C(1)
A/C(9)
B/D(1)
B/D(9)
A(17)
B(17)
(LSB)
A(1)
A(9)
B(1)
B(9)
TS11 (7A)
TS12 (7B)
TS10 (79)
TS1 (70)
TS2 (71)
TS3 (72)
TS4 (73)
TS5 (74)
TS6 (75)
TS7 (76)
TS8 (77)
TS9 (78)