GC1115_06 Datasheet, PDF (43/82 Pages) Texas Instruments – Crest Factor Reduction Processor

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GC1115
SLWS144C – FEBRUARY 2005 – REVISED JUNE 2006
CANCEL_LENGTH 0x10 (16)
Type: Read/Write Value at RESET: 0x0000
The CANCEL_LENGTH register determines the number of unique cancellation coefficients present in each
cancellation pulse (ignoring the “mirror” mode bit of the CANCEL_MODE register). The CANCEL_LENGTH must
be an odd value. See Table 10, Table 11, and Table 12 for details on the proper use of CANCEL_LENGTH.
Note that CANCEL_LENGTH and CANCEL_DELAY are related – see the discussion in the earlier section
entitled CANCEL_LENGTH and CANCEL_DELAY.
BITS
[7:0]
[15:8]
DESCRIPTION
Number of unique cancellation coefficients:
For real coefficients: odd number from 5 to 255
For complex
coefficients:
odd number from 5 to 127
Reserved
NOTE:
In most circumstances, CANCEL_LENGTH should be at least 15. For 3GPP
processing, CANCEL_LENGTH of 101 or less achieves all relevant requirements.
CANCEL_ADDR 0x11 (17) Type: Read/Write Value at RESET: 0x0000
The CANCEL_ADDR register is used to access the GC1115 shadow RAM memory. The earlier Cancellation
Coefficient Shadow RAM section described the structure of the cancellation coefficient shadow RAM. After
writing a unique address (from 0 to 767) to CANCEL_ADDR, subsequent writes to (or reads from) the
CANCEL_DATA register will auto-increment CANCEL_ADDR. The auto-increment and direct address modes
were described earlier in Writing Cancellation Coefficients to the GC1115.
BITS
[9:0]
[15:10]
DESCRIPTION
Cancellation coefficient shadow RAM memory address (0 to 767)
Reserved
CANCEL_DATA 0x12 (18) Type: Read/Write Value at RESET: 0x0000
The CANCEL_DATA register holds the 12-bit value to be written to (or read from) GC1115 cancellation
coefficient shadow RAM. The structure of the cancellation coefficient memory is described in Cancellation
Coefficient Shadow RAM. After writing a unique address (from 0 to 767) to CANCEL_ADDR, subsequent writes
to (or reads from) the CANCEL_DATA register will auto-increment CANCEL_ADDR.
BITS
[15:0]
DESCRIPTION
Value written to (or read from) cancellation coefficient shadow RAM at the address
specified in CANCEL_ADDR.
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