cx28394 Conexant Systems, Inc., cx28394 Datasheet - Page 232

• Manufacturer Part Number: cx28394
• Description: Quad/x16/octal-t1/e1/j1 Framers
• Manufacturer: Conexant Systems, Inc.

3.0 Registers
3.16 System Bus Registers
TSIG_AB
TB7ZS/EMF-BIT
3-110
100–11F—Transmit Per-Channel Control (TPCn; n = 0 to 31)
ASSIGN
TB7ZS/EMF-BIT
7
TSIG_AB—AB Signaling. In T1 mode, only AB signaling bits are updated from TSIGI to the
TSIGn buffer. If SIGFRZ active, output CD signaling bits are copied from the buffered output
AB bits respectively. In E1 mode, setting TSIG_AB forces C = 0 and D = 1 when updating the
TSIGn buffer.
Assign System Bus Time Slot—During T1 line applications where the system bus group
consists of 32 time slots, ASSIGN selects which 24 of 32 time slots are used to transport line
time slots. The number of assigned system bus time slots must always equal the number of line
time slots, therefore ASSIGN must be active in all 32 SBCn locations during E1 modes.
Unassigned time slots are not updated by the receiver as it fills the RSLIP buffer. T1 time slots
are filled sequentially from RSLIP 1 to 24. Time slots 0 and 25 to 31 are reserved for
unassigned values. Values are read from either the assigned or unassigned locations in a
sequential fashion based upon the ASSIGN bit. System bus output data for unassigned time
slots is taken from RSLIP buffer, which the processor can fill with any desired 16-bit fixed
value (8 bits in RSLIP_LO, plus 8 bits in RSLIP_HI).
Bit7 Zero Code Substitution/Embedded F-bit Value (Applicable in T1 mode only)—For
assigned system bus time slots [ASSIGN; addr 0E0-0FF], TB7ZS replaces Bit 7 of the time
slot with a 1, if examination of 8-bit output detects all zeros. For an unassigned time slot where
TIDLE is active, EMF-BIT replaces all embedded F-bit outputs with the programmed
EMF-BIT value.
TLOOP
0 = ABCD signaling
1 = AB signaling
0 = unassigned system bus time slot
1 = assigned system bus time slot
0 = no effect or force embedded F-bit (low)
1 = enable B7ZS or force embedded F-bit (high)
6
TIDLE
5
TLOCAL
4
Conexant
TSIGA/TSIGO
3
TSIGB/RSIGO
2
Quad/x16/Octal—T1/E1/J1 Framers
CX28394/28395/28398
TSIGC
1
TSIGD
100054E
0