DS2154 datasheet(47/87 Pages) DALLAS

47 / 87 page

DS2154

47 of 87

Each Receive Signaling Register (RS1 to RS16) reports the incoming signaling from two timeslots. The

bits in the Receive Signaling Registers are updated on multiframe boundaries so the user can utilize the

Receive Multiframe Interrupt in the Receive Status Register 2 (SR2.7) to know when to retrieve the

signaling bits. The user has a full 2 ms to retrieve the signaling bits before the data is lost. The RS

registers are updated under all conditions. Their validity should be qualified by checking for

synchronization at the CAS level. In CCS signaling mode, RS1 to RS16 can also be used to extract

signaling information. Via the SR2.7 bit, the user will be informed when the signaling registers have been

loaded with data. The user has 2 ms to retrieve the data before it is lost. The signaling data reported in

RS1 to RS16 is also available at the RSIG and RSER pins.

A change in the signaling bits from one multiframe to the next will cause the RSA1 (SR1.7) and RSA0

(SR1.5) status bits to be set at the same time. The user can enable the INT pin to toggle low upon

detection of a change in signaling by setting either the IMR1.7 or IMR1.5 bit. Once a signaling change

has been detected, the user has at least 1.75 ms to read the data out of the RS1 to RS16 registers before

the data will be lost.

S1 TO TS16: TRANSMIT SIGNALING REGISTERS (Address=40 to 4F Hex)

(MSB)

(LSB)

0000

XYXX

TS1 (40)

A(1)

B(1)

C(1)

D(1)

A(16)

B(16)

C(16)

D(16)

TS2 (41)

A(2)

B(2)

C(2)

D(2)

A(17)

B(17)

C(17)

D(17)

TS3 (42)

A(3)

B(3)

C(3)

D(3)

A(18)

B(18)

C(18)

D(18)

TS4 (43)

A(4)

B(4)

C(4)

D(4)

A(19)

B(19)

C(19)

D(19)

TS5 (44)

A(5)

B(5)

C(5)

D(5)

A(20)

B(20)

C(20)

D(20)

TS6 (45)

A(6)

B(6)

C(6)

D(6)

A(21)

B(21)

C(21)

D(21)

TS7 (46)

A(7)

B(7)

C(7)

D(7)

A(22)

B(22)

C(22)

D(22)

TS8 (47)

A(8)

B(8)

C(8)

D(8)

A(23)

B(23)

C(23)

D(23)

TS9 (48)

A(9)

B(9)

C(9)

D(9)

A(24)

B(24)

C(24)

D(24)

TS10 (49)

A(10)

B(10)

C(10)

D(10)

A(25)

B(25)

C(25)

D(25)

TS11 (4A)

A(11)

B(11)

C(11)

D(11)

A(26)

B(26)

C(26)

D(26)

TS12 (4B)

A(12)

B(12)

C(12)

D(12)

A(27)

B(27)

C(27)

D(27)

TS13 (4C)

A(13)

B(13)

C(13)

D(13)

A(28)

B(28)

C(28)

D(28)

TS14 (4D)

A(14)

B(14)

C(14)

D(14)

A(29)

B(29)

C(29)

D(29)

TS15 (4E)

A(15)

B(15)

C(15)

D(15)

A(30)

B(30)

C(30)

D(30)

TS16 (4F)

SYMBOL

POSITION

NAME AND DESCRIPTION

TS1.0/1/3

Spare Bits.

TS1.2

Remote Alarm Bit.

A(1)

TS2.7

Signaling Bit A for Channel 1.

D(30)

TS16.0

Signaling Bit D for Channel 30.

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