EP9307-IR Cirrus Logic Inc, EP9307-IR Datasheet - Page 14

• Manufacturer Part Number: EP9307-IR
• Description: IC Universal Platform ARM9 SOC Prcessor
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9307-IR

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, Ethernet, I²C, IrDA, Keypad/Touchscreen, SPI, UART/USART, USB
• Peripherals: AC'97, DMA, I&sup2:S, LCD, LED, MaverickKey, POR, PWM, WDT
• Number Of I /o: 14
• 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: -40°C ~ 85°C
• Package / Case: 272-TFBGA
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: EDB9307A-Z
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: 598-1133 - KIT DEVELOPMENT EP9307 ARM9
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: No
• Other names: 598-1255

14
Description 11
An erroneous memory transfer to or from any of the coprocessor general purpose registers c0 through c15
can occur given the following conditions are satisfied:
1) The first instruction:
2) The second consecutive instruction:
When the error occurs, the result is either coprocessor register or memory corruption. Here are several
examples:
Workaround
The software workaround involves avoiding a pair of consecutive instructions with these properties. For
example, if a conditional coprocessor two-word load or store appears, insure that the following instruction
is not a coprocessor load or store:
Another workaround is to insure that the first instruction is not conditional:
Note: If both instructions depend on the same condition code, the error should not occur, as either both or
neither will execute.
cfstr64ne
cfldrs
cfldrdge
cfstrd
cfldr64ne
cfldrdgt
cfstr64ne
nop
cfldrs
cfstr64
cfldrs
- is a two-word load or store
- fails its condition code check.
- does not busy-wait.
- is a coprocessor load or store.
- is executed.
- does not busy-wait.
c0, [r0, #0x0]
c2, [r2, #0x8]
c0, [r0, #0x0]
c2, [r2, #0x8]
c0, [r0, #0x0]
c2, [r2, #0x8]
c0, [r0, #0x0]
c2, [r2, #0x8]
c0, [r0, #0x0]
c2, [r2, #0x8]
4
.
; assume does not execute
; could corrupt c2!
; assume does not execute
; could corrupt memory!
; assume does not execute
; could corrupt c2!
; assume does not execute
; separate two instructions
; c2 will be ok
; executes
; c2 will be ok
ER667E2B