S/UNI®-JET Data Sheet
Released
DS27_53
The DS27_53 bit is used to select between the long data structure (27-byte words in 16-bit
mode and 53-byte words in 8-bit mode) and the short data structure (26-byte words in 16-bit
mode and 52-byte words in 8-bit mode) on the ATM interface. When DS27_53 is set to logic
one, the RXCP-50 and TXCP-50 blocks are configured to operate with the long data
structure; when DS27_53 is set to logic zero, the RXCP-50 and TXCP-50 are configured to
operate with the short data structure.
8KREFO
The 8KREFO bit is used, in conjunction with the PLCPEN bit in the SPLR Configuration
Register to select the function of the REF8KO/RPOHFP/RFPO/RMFPO[x] output pin. When
PLCPEN is logic one, the RPOHFP function will be selected and 8KREFO has no effect.
(Note: RPOHFP is inherently an 8kHz reference). If PLCPEN is logic zero and if 8KREFO
becomes logic one, then an 8 kHz reference will be derived from the RCLK[x] signal and
output on REF8KO. If 8KREFO and PLCPEN are both logic zero, then the RXMFPO
register bit in the S/UNI-JET Configuration 2 Register will select either the RFPO or RMFPO
function.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990267, Issue 3
84
PMC [ PMC-SIERRA, INC ]
