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CS22210 Scheda tecnica(PDF) 5 Page - Cirrus Logic

Il numero della parte CS22210
Spiegazioni elettronici  WIRELESS PCI/USB CONTROLLER
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Produttore elettronici  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

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CS22210 PCI/USB Wireless Controller
5 of 31
D556PP2
Rev. 3.0
www.cirrus.com
3.1
Embedded ARM Core and System Support Logic
The processing elements of the CS22210 include the ARM7TDMI core and its associated
system control logic.
The ARM processor and system controller consist of a memory
management unit, 4-KB write through cache controller, 20 IRQ and 4 FIRQ interrupt
controller, and 2 general purpose timers. The ARM processor and integrated system support
logic provide the necessary execution engine to support a real time multi-tasking operating
system, the network protocol stack, and firmware services. In addition, system performance
monitor logic is included to aid in system performance fine-tuning (e.g. cache hit, CPI
numbers).
Memory Management Unit
ARM instructions and data are fetched from system memory a cache-line (4/8 – Dwords
/Programmable) at a time when caching is turned on. During a cache line fill, critical word
data, i.e., the access that caused the miss, is forwarded to the ARM and also written into the
data RAM cache. The non-critical words in the line fetched following the critical word are then
written to the cache on a Dword basis, as they become available.
Memory writes are posted to dual 4-Dwords (32-bit) memory write posting buffers. Write
posts use the sequential addressing feature on the memory bus. With dual buffering an out of
sequence write will post to one write buffer while the other buffer is flushed to memory.
There is one 8Dword Read Buffer in the MEM block. The buffer is used for both cacheable
and non-cacheable memory space.
Interrupt Controller
The interrupt controller provides two interrupt channels to the ARM processor. One interrupt
channel is presented to the ARM on its nFIQ, and the other channel is presented on its nIRQ
pin. These are referred to as the FIQ channel and the IRQ channel. Both channels operate
in identical but independent fashion. The FIQ channel has a higher priority on the ARM
processor than the IRQ channel.
The interrupt controller includes a CONTROL register for each logical interrupt in the ARM
complex. The CONTROL register serves the following main purposes:
Provides the mapping between the EXT_INT inputs (physical interrupts) and the logical
interrupt
Selects the particular type of signaling expected on the EXT_INT inputs: level, edge,
active level high/low etc.
Enables or disable a logical interrupt


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