3.0 Registers
CX28394/28395/28398
3.7 Primary Control and Status Registers
Quad/x16/Octal—T1/E1/J1 Framers
TIMEOUT
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 3-8), TIMEOUT is latched active high. Processor-generated reframe requests (RFORCE
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.
0 = no candidate; search active, aborted, or found
1 = framer search timeout (multiple candidates)
Table 3-8. Maximum Average Reframe Time (MART) and Framer Timeout
Framer Mode
MART
TIMEOUT (addr 017)
Ft
3.5 ms
1.0 ms
3.5 ms
4.5 ms
2.0 ms
15.0 ms
10.0 ms
15.0 ms
15.0 ms
0.5 ms
2.0 ms
10.0 ms
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
8 ms ±125 µs
8 ms ±125 µs
8 ms ±125 µs
Ft + T1DM
SF
SF + JYEL
SF + TIDM
SLC
ESF
ESF + CRC
ESF + MIMIC
FAS
CAS
MFAS
NOTE(S): MART is defined (per Bellcore TA-0278) as the difference between the time that
known good pseudo-random DS1 input is applied and the time that a valid DS0 signal is
observed at the output.
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).
0 = offline framer inactive; search completed, aborted or timed out
1 = offline framer actively searching for alignment
NOTE:
RFORCE or TFORCE don’t change current RLOF or TLOF status. RFORCE or
TFORCE is cleared by framer transition to ACTIVE.
RX/TXN
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 = search data from Transmit System Bus PCM Input (TPCMI)
1 = search data from receive line interface unit
3-30
Conexant
100054E
CONEXANT [ CONEXANT SYSTEMS, INC ]
