PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
Register 0x184: Framing Bit Threshold
Bit
Type
Function
Default
15:7
6:0
Unused
FTHRES[6:0]
X
0x1F
R/W
This register contains the threshold used by the clock activity monitor to detect
for framing bits/bytes.
FTHRES[6:0]
The framing bit threshold bits (FTHRES[6:0]) contains the threshold used by
the clock activity monitor to detect the presence of framing bits. A counter in
the clock activity monitor increments at each REFCLK and is cleared by a
rising edge of the TSCLK. When the counter exceeds the threshold given by
FTHRES[6:0], a framing bit/byte has been detected. FTHRES[6:0] should be
set as a function of the REFCLK period and the expected gapping width of
TSCLK during framing bits/bytes.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
145
PMC [ PMC-SIERRA, INC ]
