CX28398 Conexant Systems, CX28398 Datasheet - Page 152

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

3.0 Registers
3.7 Primary Control and Status Registers
TIMEOUT
Table 3-8. Maximum Average Reframe Time (MART) and Framer Timeout
ACTIVE
RX/TXN
3-30
Ft
Ft + T1DM
SF
SF + JYEL
SF + TIDM
SLC
ESF
ESF + CRC
ESF + MIMIC
CAS
MFAS
NOTE(S):
known good pseudo-random DS1 input is applied and the time that a valid DS0 signal is
observed at the output.
FAS
Framer Mode
MART is defined (per Bellcore TA-0278) as the difference between the time that
Framer Search Timeout—Cleared when the offline framer transitions to its ACTIVE state. If
multiple frame candidates exist over the entire mode-dependent timeout interval (refer to
Table
or TFORCE) initiate a single search that extends for up to 24 ms before TIMEOUT. After
reporting TIMEOUT, the offline framer starts another search if the reframe request (RLOF or
TLOF) is active.
Framer Active—Offline framer transitions to its ACTIVE state in response to RFORCE or
TFORCE reframe request from the processor or in response to RLOF or TLOF reframe
request from an online framer. Offline framer remains ACTIVE until alignment is found
(FOUND), search is aborted [see RABORT, addr 040; or TABORT, addr 071], search reaches
its timeout interval (TIMEOUT), or all possible frame candidates are eliminated (INVALID).
NOTE:
RX/TX Reframe Operation—Indicates which direction the offline framer is actively searching
or most recently searched for frame alignment. RX/TXN status is updated when offline framer
transitions to its ACTIVE state in response to a reframe request.
0 = no candidate; search active, aborted, or found
1 = framer search timeout (multiple candidates)
0 = offline framer inactive; search completed, aborted or timed out
1 = offline framer actively searching for alignment
0 = search data from Transmit System Bus PCM Input (TPCMI)
1 = search data from receive line interface unit
3-8), TIMEOUT is latched active high. Processor-generated reframe requests (RFORCE
RFORCE or TFORCE don’t change current RLOF or TLOF status. RFORCE or
TFORCE is cleared by framer transition to ACTIVE.
15.0 ms
10.0 ms
15.0 ms
15.0 ms
10.0 ms
3.5 ms
1.0 ms
3.5 ms
4.5 ms
2.0 ms
0.5 ms
2.0 ms
MART
Conexant
TIMEOUT (addr 017)
8 ms 125 s
8 ms 125 s
8 ms 125 s
12 ms 1 bit
12 ms 1 bit
12 ms 1 bit
12 ms 1 bit
12 ms 1 bit
24 ms 1 bit
24 ms 1 bit
24 ms 1 bit
24 ms 1 bit
Quad/x16/Octal—T1/E1/J1 Framers
CX28394/28395/28398
100054E