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CIRCC датащи(PDF) 65 Page - SMSC Corporation

номер детали CIRCC
подробное описание детали  Consumer Infrared Communications Controller
PDF  70 Pages
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производитель  SMSC [SMSC Corporation]
домашняя страница  http://www.smsc.com
Logo SMSC - SMSC Corporation

CIRCC датащи(HTML) 65 Page - SMSC Corporation

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65
Zero Wait State Support
nSRDY
nSRDY can be driven by the CIrCC to indicate
that an access cycle shorter than the standard
I/O cycle can be executed.
NOTE: the names
nSRDY & nNOWS can be used interchangeably.
nSRDY is enabled by the No Wait bit in SCE
Configuration Register B. When No Wait is one,
nSRDY goes active following the trailing edge of
the ISA I/O command and inactive following the
rising edge (Figure 35). nSRDY is suppressed
during DMA & refresh cycles, i.e. when AEN is
active, or when IOCHRDY is inactive. Zero Wait
State support is only available when the SCE is
enabled.
The Interaction of nSRDY
and
IOCHRDY
determine
the
three types of ISA access
cycles: no-wait-state cycle, standard cycle, ready
cycle (Table 31). NOTE: An inactive IOCHRDY
suppresses nSRDY.
Table 31 - nSRDY and IOCHRDY Interaction
nSRDY
IOCHRDY
DESCRIPTION
active
active
No-wait-state Cycle (shortest length)
inactive
active
Standard Cycle (mean length)
x
inactive
Ready Cycle (longest length)
AEN
I/Ox
nSRDY
No Wait
FIGURE 35 - nSRDY TIMING



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