BT8954 CONEXANT [Conexant Systems, Inc], BT8954 Datasheet - Page 69

• Manufacturer Part Number: BT8954
• Description: VOICE PAIR GAIN FRAMER
• Manufacturer: CONEXANT [Conexant Systems, Inc]

Bt8954
Voice Pair Gain Framer
EXTRA_SIG_
UPDATE[1:0]
DP_LOOP
PP_LOOP
SYNC_SLAVE
VER[2:0]
N8954DSC
0xC1—Revision Identification (REV_ID)
—
7
Number of extra LD_TSIG/RD_RSIG signaling interrupts per 6 ms DSL frame in addition to
the normal signaling interrupt that occurs coincident with the DSL frame boundary.
Loopback towards DSL on the PCM side—The PCMT input is replaced by data generated
from the receiver. The receiver operates normally, but the transmit PCMT is ignored.
Loopback towards PCM on the PCM Side—The PCMR output is connected from the PCMT
input. Signals are switched directly at the I/O pins. DSL transmit and receive channels operate
normally, except the receive channel outputs are replaced by loopback signals.
PCM Syncs slaved to the DSL receives sync when set to 1.
Version Number—Contains the device revision level which the MC can read to determine the
installed device.
—
6
—
5
00 = Default case: no extra signaling interrupt. Corresponds to one
signaling interrupt every 6 ms, coincident with the DSL frame boundary.
01 = One extra signaling interrupt. Corresponds to two signaling interrupts
every 6 ms, or one signaling interrupt every 3 ms. That is, one occurs
coincident with the DSL frame boundary, and the other occurs 3 ms
(or 24 payload blocks) later.
10 = Two extra signaling interrupts. Corresponds to three signaling
interrupts every 6 ms. That is, one signaling interrupt every 2 ms: one
occurs coincident with the DSL frame boundary, and the other two
signaling interrupts occur 2 ms (or 16 payload blocks) and 4 ms (or 32
payload blocks) later.
11 = Five extra signaling interrupts. Corresponds to six signaling
interrupts every 6 ms. That is, one signaling interrupt every 1 ms: one
occurs coincident with the DSL frame boundary, and the other five
signaling interrupts occur 1 ms (or 8 payload blocks), 2 ms (or 16 payload
blocks), 3 ms (24 payload blocks), 4 ms (or 32 payload blocks), and 5 ms
(or 40 payload blocks) later.
0 = Normal PCM transmit operation
1 = Transmit PCM data supplied by the receiver
0 = Normal PCM receive
1 = PCMR is supplied by PCM transmit input
0 = PCM Sync Master
1 = Receive DSL Sync Master
000 = Bt8954 Rev A
001 = Bt8954 Rev B
010 = Bt8954 Rev C
—
4
Conexant
—
3
2
VER[2:0]
1
4.0 Registers
4.8 Common
0
4-17