EP9315-CB Cirrus Logic Inc, EP9315-CB Datasheet - Page 79

• Manufacturer Part Number: EP9315-CB
• Description: IC ARM920T MCU 200MHZ 352-PBGA
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9315-CB

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, PCMCIA, SPI, UART/USART, USB
• Peripherals: AC'97, DMA, I&sup2:S, LCD, LED, MaverickKey, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 3.6 V
• Data Converters: A/D 8x12b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 352-BGA
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: EDB9315A-Z
• For Use With: 598-1144 - KIT DEVELOPMENT EP9315 ARM9
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: No
• Other names: 598-1261

DS785UM1
3.2.2 Example 2
3.2.2.1 C Code
3.2.2.2 MaverickCrunch Assembly Language Instructions
The following function performs an FIR filter on the given input stream. The variable “data”
points to an array of floating point values to be filtered, “n” is the number of samples for which
the filter should be applied, “filter” is the FIR filter to be applied, and “m” is the number of taps
in the FIR filter. The “data” array must be “n + m - 1” samples in length, and “n” samples will
be produced.
void
ComputeFIR(float *data, int n, float *filter, int m)
{
}
ComputeFIR
outer_loop
inner_loop
loop
cfmul32 c0, c0, c3
cfsub32 c0, c0, c2
cfcmp32 r15, c0, c1
blt loop
cfstr32 c0, [r0, #0x0]
int i, j;
float sum;
for(i = 0; i < n; i++)
{
}
mov
mov
sum = 0;
for(j = 0; j < m; j++)
{
}
data[i] = sum;
mov
cfsub64 c0, c0, c0
cfcvt32s c0, c0
sum += data[i + j] * filter[j];
r1, r1, lsl #2
r3, r3, lsl #2
cfldrs
r12, r3
c2, [r0], #4
Copyright 2007 Cirrus Logic
; c0 < 10 ?
;
; c0 <= c0 * 5
; c0 <= c0 - 1
no, store result
; int_sum = 0;
;
; n *= 4
; m *= 4
; sum = float(int_sum);
; c2 = *data++;
; j = m * 4
yes
MaverickCrunch Co-Processor
EP93xx User’s Guide
3-9
3