CX28398 Conexant Systems, CX28398 Datasheet - Page 235

• Manufacturer Part Number: CX28398
• Description: (CX28394 - CX28398) Quad/x16/Octal?T1/E1/J1 Framers
• Manufacturer: Conexant Systems

CX28394/28395/28398
Quad/x16/Octal—T1/E1/J1 Framers
TPCM[1]
TPCM[2]
TPCM[3]
TPCM[4]
TPCM[5]
TPCM[6]
TPCM[7]
TPCM[8]
RSIG_AB/EMF-BIT
100054E
160–17F—Transmit PCM Slip Buffer (TSLIP_HIn; n = 0 to 31)
180–19F—Receive Per-Channel Control (RPCn; n = 0 to 31)
TPCM[1]
RSIG_AB/
EMF-BIT
7
7
First bit
Second bit
Third bit
Fourth bit
Fifth bit
Sixth bit
Seventh bit
Eighth bit received on TPCMI
AB Signaling (Per-Channel RSIG_AB [without DEBOUNCE])—In E1 mode, received
signaling is placed into RSIGn as usual. However, RSIGO output duplicates the buffered AB
bit value in the CD output bits, thus sending ABAB on RSIGO instead of ABCD. In T1 mode,
RSIG_AB instructs the receiver to use available RSIGn buffer space to meet PUB43801 and
TR-170. PUB43801 and TR-170 require three SF multiframes of receive signaling buffer
storage before output. Every 24 frames, the received ABCD signaling value is transferred from
the RSIGn input buffer space to RSIGn output buffer space, regardless of whether the receiver
operates in SF, SLC, or ESF mode. Therefore, in SF mode, the ABCD value contains AB =
AB(N-1) and CD = AB(N) from two multiframes. Since multiframe N-1 is the older sample,
AB(N-1) replaces AB(N) in the event of signaling freeze. RSIGO and RPCMO signaling bit
output values are always taken from the RSIGn output buffer, according to the RSB frame
number.
TPCM[2]
RIDLE
6
6
TPCM[3]
SIG_STK
5
5
TPCM[4]
RLOCAL
4
4
Conexant
TPCM[5]
RSIGA
3
3
TPCM[6]
RSIGB
2
2
TPCM[7]
3.16 System Bus Registers
RSIGC
1
1
3.0 Registers
TPCM[8]
RSIGD
0
0
3-113