mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 493

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

INDEX— Auto-Increment Index
PC— Preset Coefficients Pointer
OPCODE—Function Operation Code
This field specifies the function to be executed. Table 16-6 contains the value for this field.
16.3.4.1.3 FIR1 Parameter Packet. The FIR1 parameter packet is composed of seven
16-bit half-words and described in the following table.
16.3.4.1.4 Application Example. The FIR1 is used in decimation and RX interpolation. For
example, the following function descriptor structure can be used to implement a 2 to 1
decimation.
OFFSET + 0
OFFSET + 2
Half-word 1
Half-word 2
Half-word 3
Half-word 4
Half-word 5
Half-word 6
Half-word 7
ADDRESS
00 = The X (input) pointer is not incremented.
01 = The X (input) pointer is incremented by one sample.
10 = The X (input) pointer is incremented by two samples.
11 = The X (input) pointer is incremented by three samples.
0 = The coefficients pointer is not preset after each iteration.
1 = The coefficients pointer is preset after each iteration to the CBASE pointer.
0
S
1
0
CBASE
XYPTR
NAME
RES
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Freescale Semiconductor, Inc.
For More Information On This Product,
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Table 16-8. FIR1 Parameter Packet
Number of Iterations
Number of TAPs-1. The number of taps must be a multiple of four
Filter Coefficients Vector Base Address Pointer
Samples Buffer Size-1. The minimum sample buffer size is 8 (4 samples)
Pointer to a structure composed of the input sample data pointer and the output
buffer pointer
Output Buffer Size-1. The minimum output buffer size is 4 (2 outputs)
Reserved
MPC823 REFERENCE MANUAL
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Go to: www.freescale.com
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1
I=3 (THREE ITERATIONS)
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10
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1
DESCRIPTION
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Communication Processor Module
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00001
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16-41
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