BT8376EPF datasheet(244/323 Pages) CONEXANT

244 / 323 page

Bt8370/8375/8376

3.17 System Bus Registers

Fully Integrated T1/E1 Framer and Line Interface

3-126

Conexant

N8370DSE

0DA—Receive Signaling Stack (STACK)

STACK contains new signaling information from those channels with SIG_STK [addr 180–19F] enabled.

STACK allows the processor to monitor only changed ABCD signaling values from the selected channels.

RSIG interrupt [addr 008] is triggered at the end of any multiframe where one or more ABCD signaling values

have changed. The processor reads the STACK address twice to retrieve the channel number (Word 0) and to

retrieve the new ABCD value (Word 1). The processor continues to read from STACK until empty. An empty

Stack is indicated when either MORE = 0 in Word 1 or no Word 1 exists (the last two STACK reads are Word 0).

Internal STACK read/write pointers are initialized by RESET [addr 001]. STACK contents are updated for

each channel in which the stack is enabled [SIG_STK; addr 180–19F]. STACK contents are updated with new

output signaling if the buffered RSIGn input and output ABCD signaling values differ. STACK is evaluated on a

channel-by-channel basis after the D-bit is updated. The processor must poll the RSIG interrupt to determine

when STACK has new information.

Word 0: Channel Number (first read)

WORD

Stack Word ID (always 0 in Word 0)

More Stack Contents (always 1 in Word 0)

CH[4:0]

Channel Number (E1 range 0–31; T1 range 1–24)

Word 1: New Signaling Value (second read)

WORD

Stack Word ID (always 1 in Word 1)

More Stack Contents equals 1 if more available.

SIG_BITA–D

Signaling Bit A–D—Processor reads new ABCD signaling value from this location. The

ABCD value is also present in RSIGn (addr 1A0–1BF) output signaling buffer, so the

processor need not store a local copy of each channel’s signaling status.

WORD

—

CH[4]

CH[3]

CH[2]

CH[1]

CH[0]

WORD

——

SIG_BITA

SIG_BITB

SIG_BITC

SIG_BITD

WORD

MPU Response

First word, get channel

Never used

No change or last change, stop

New signaling, keep reading

BT8376EPF Datasheet(PDF) 244 Page - Synaptics Incorporated.

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