Bt8370/8375/8376
3.0 Registers
Fully Integrated T1/E1 Framer and Line Interface
3.6 Primary Control and Status Registers
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 3-5), TIMEOUT is latched active-high. Processor-generated reframe requests (RFORCE
or TFORCE) initiate a single search that extends to a maximum of 24 ms before TIMEOUT.
After reporting TIMEOUT, the offline framer begins 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)
ACTIVE
Framer Active—Offline framer transitions to its ACTIVE state in response to an RFORCE or
TFORCE reframe request from the processor, or in response to an RLOF or TLOF reframe
request from the online framer.
The offline framer remains ACTIVE until any of the following occurs:
• alignment is found (FOUND)
• the search is aborted [see RABORT; addr 040, or TABORT; addr 071]
• the search reaches its timeout interval (TIMEOUT)
• all possible frame candidates are eliminated (INVALID)
NOTE:
RFORCE or TFORCE does not change the current RLOF or TLOF status. RFORCE
or TFORCE is cleared by the framer transition to ACTIVE.
0 = offline framer inactive; search completed, aborted or timed out
1 = offline framer actively searching for alignment.
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 the 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.
N8370DSE
Conexant
3-31
CONEXANT [ CONEXANT SYSTEMS, INC ]
