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IRCC Datasheet(PDF) 75 Page - SMSC Corporation

Part # IRCC
Description  INFRARED COMMUNICATIONS CONTROLLER
PDF  79 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

IRCC Datasheet(HTML) 75 Page - SMSC Corporation

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75
Zero Wait State Support
nSRDY
nSRDY can be driven by the IrCC 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 48). 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
nSRDY and IOCHRDY determine the three types
of ISA access cycles: no-wait-state cycle,
standard cycle, ready cycle (Table 32). NOTE:
An inactive IOCHRDY suppresses nSRDY.
Table 32 - 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 48 - nSRDY TIMING



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