
Data Sheet
June 2002
TMXF28155 Supermapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
427
Agere Systems Inc.
18 SPE Mapper Functional Description
(continued)
18.15.2 Loss of Clock and Loss of Sync Detectors
The SPE mapper detects and reports the loss of the input clocks for the transmit telecom bus clock, device pin
TLSCLK (AA2), in bit SPE_TLSLOC (
Table 158 on page 140
), the 51.84 MHz transmit low-speed clock, device pin
TLSC52 (AC3), in bit SPE_TC52LOC (
Table 158
), and the external DS3 clock, device pin DS3DATAINCLK (J22),
in bit SPE_TDS3LOC (
Table 158
). Loss of clock is determined by stuck high or stuck low for time T. The detection
time T will be greater than 10 μs but less than 125 μs. The function uses the microprocessor clock as its reference.
The device will report a change in the loss of clock state for the monitored clocks using bits SPE_TLSLOCD
(
Table 156 on page 136
), SPE_TC52LOCD (
Table 156
), and SPE_TDS3LOCD (
Table 156
), respectively. The
microprocessor interrupt may be masked using bits SPE_TLSLOCM, SPE_TC52LOCM, and SPE_TDS3LOCM
(
Table 157 on page 138
), respectively.
The SPE mapper detects loss-of-sync conditions for the telecom bus sync signals, device pins TLSSYNC52 (AD2),
TLSJ0J1V1 (AB4), TLSSPE (AB2), and TLSV1 (AB3). The loss of sync states are reported in bits SPE_TSY52LOS
(
Table 158
), SPE_TJ0J1V1LOS (
Table 158
), SPE_TSPELOS (
Table 158
), and SPE_TV1LOS (
Table 158
),
respectively. The device will report a change in the loss of sync state for the monitored sync signals in bits
SPE_TSY52LOSD (
Table 156
), SPE_TJ0J1V1LOSD (
Table 156
), SPE_TSPELOSD (
Table 156
), and
SPE_TV1LOSD (
Table 156
), respectively. The microprocessor interrupt may be masked using bits
SPE_TSY52LOSM, SPE_TJ0J1V1LOSM, SPE_TSPELOSM, and SPE_TV1LOSM (
Table 157
), respectively.
18.15.3 J1 Byte Insert
A 64-byte sequence stored in SPE_TJ1DINS[1—64][7:0] (
Table 173 on page 151
) will be inserted into the outgo-
ing J1 byte when bit SPE_TJ1INS = 1 (
Table 164 on page 146
); otherwise, the associated POAC value is inserted
when bit SPE_TPOAC_J1 = 1 (
Table 164
) or the default value, determined by the value of microprocessor bit
SMPR_OH_DEFLT (
Table 77 on page 70
), is inserted when SPE_TPOAC_J1 = 0.
The CRC for the J1 trace has to be programmed into the J1 bytes by the user.
18.15.4 B3 BIP-8 Calculation and Insert
The B3 bytes are allocated for path overhead error monitoring function. This function is a bit interleaved parity
8 code (BIP-8) using even parity. The BIP-8 is computed before scrambling over all bits of the previous AU-3/TUG-
3 frame, and is placed in byte B3 of the current frame also before scrambling. When enabled with control bit,
SPE_TB3ERRINS (
Table 166 on page 148
), a single B3 byte can be inverted each time bit SPE_BERR_INS
(
Table 166
) is asserted.
18.15.5 C2 Signal Label Byte Insert
When bit SPE_TC2INS = 1 (
Table 164 on page 146
), the value in SPE_TC2DINS[7:0] (
Table 167 on page 149
) is
inserted into the outgoing C2 byte; otherwise, insert the associated POAC value when SPE_TPOAC_C2 = 1
(
Table 164
) or insert the default value determined by the microprocessor bit SMPR_OH_DEFLT when bit
SPE_TPOAC_C2 = 0.
18.15.6 REI-P G1(7:4) Insert
Four bits of the G1 byte G1(7:4) are allocated for use as a path remote error indication (REI). For AU-3/TUG-3 sig-
nals, these bits convey the count (in the range of 0 to 8) of interleaved bit blocks that have been detected in error
by the BIP-8 (B3) detector on the received signal.
This function can be inhibited with bit SPE_TREIP_INH (
Table 165 on page 148
) and the value in
SPE_TG1DINS[7:4] (
Table 167 on page 149
) is inserted in G1(7:4) bits. A continuous error in the G1 byte can be
transmitted using control bit SPE_TREIERRINS (
Table 166 on page 148
). A value of 0x03 will be inserted when
SPE_TREIERRINS = 1, subject to SPE_BERR_INS and SMPR_BER_INSRT being enabled.