STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
PROPRIETARY AND CONFIDENTIAL
224
The "Timeslot" designation refers to the E1 assignment. The "Channel"
designation refers to the T1 assignment.
The bits within each control byte are allocated as follows:
Table 44
- TPSC Indirect Registers 20H-3FH: PCM Data Control byte
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
INVERT
IDLE_DS0
DMW
SIGNINV
TEST
LOOP
ZCS0
ZCS1
X
X
X
X
X
X
X
X
INVERT:
When the INVERT bit is set to a logic 1, data from the BTPCM input is
inverted for the duration of that channel.
The INVERT bit only has effect in T1 mode.
IDLE_DS0:
When the IDLE_DS0 bit is set to a logic 1, data from the IDLE Code Byte
replaces the BTPCM input data for the duration of that channel. The
IDLE_DS0 bit controls insertion of the IDLE Code Byte only in T1 mode.
When the NxDS0 mode is active, IDLE_DS0 also controls the generation of
BTCLK. When IDLE_DS0 is a logic 0, data is inserted from the transmit
backplane interface during that channel, and eight clock pulses are generated
on BTCLK. When IDLE_DS0 is a logic 1, an IDLE code byte is inserted, and
BTCLK is suppressed for the duration of that channel.
SIGNINV:
When the SIGNINV bit is set to a logic 1, the most significant bit from the
BTPCM input is inverted for that channel.
The SIGNINV bit only has effect in T1 mode.