cx28365 Mindspeed Technologies, cx28365 Datasheet - Page 84

• Manufacturer Part Number: cx28365
• Description: X12, X6, X4 T3/e3 Framer And Atm Cell Transmission Convergence Sublayer Processor
• Manufacturer: Mindspeed Technologies

Functional Description
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overrun an old word that has not been read yet. Reading an empty stack results in
reading an undefined code word except for valid bit and more bit which are zero.
Writing into the FEAC Stack
A code word is shifted in to the stack for one of three reasons:
Writing a new word into the FEAC stack causes shifting of old code words, possibly
overrunning the oldest code word.
Reading from the FEAC Stack
The messages are read from the FEAC stack in FIFO style. Reading FEAC stack can
be done by either polling or interrupt modes.
The sequence of operation in interrupt mode is as follows:
The sequence of operation in polling mode is as follows:
The FEAC stack logic cannot be disabled. Host systems using the interrupt mode to
read the FEAC messages should not enable the FEAC stack interrupts. The masking is
performed by setting the RxFEACSNEIE in Feature3 Control register. Systems using
the polling mode should not read the FEAC Stack register.
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Preliminary Information/Mindspeed Proprietary and Confidential
If the code word is different from the previous code word.
If the stack was empty (either after reset or after channel enable).
When the FEAC channel comes out of Idle state (all 1s in the FEAC channel).
Wait for an interrupt, read the RxFEACSNE before the first read.
Read the FEAC stack message only if RxFEACSNE is on.
If the more bit in the read word is off, go to step 1 (wait for the next interrupt) or
else go to step 2.
Read the FEAC FIFO register. The word read is valid only if the valid bit is on.
If the more bit is on, the next word read is also valid.
Mindspeed Technologies™
CX28365/6/4 Data Sheet
500028C